Silicone Hydrogel Lenses

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Silicone Hydrogel Lenses

The development of contact lenses | Silicone hydrogel | Oxygen permeability | Contact lenses for dry eyes | How to choose the right contact lenses

Extended periods of contact lens use can irritate the eyes. Silicone hydrogel lenses' properties make them an attractive choice for people with dry eyes.

The development of contact lenses

Arguably the main preoccupation of contact lens developers over the years has been increasing oxygen permeability. If worn for an extended period of time, traditional contact lenses deprive the cornea of much-needed oxygen. Without adequate oxygen, the cornea dries out and can become inflamed, which is a condition known as keratitis.

This can cause itchiness and pain, and in more severe cases, can impair vision and lead to long-term damage such as scarring. In the quest to find a longer lasting, comfortable contact lens, the ability to improve oxygen permeability is crucial. Thus, silicone hydrogel contact lenses have been a game-changer for all contact lens wearers.

Silicone hydrogel

Soft contact lenses were first created in the 1960s, after the development of ‘hydrophilic gels’ or hydrogels.

Problems of keratitis became more widespread with the introduction of extended wear contact lenses in the 90s because more people were wearing contact lenses for longer periods of time. This resulted in many people getting infections.

The first silicone hydrogel contact lenses were introduced to the public in 1999. This amazing new technology allowed up to seven times more oxygen to reach the cornea compared to traditional hydrogel lenses, meaning that for the first time extended wear contact lenses did not lead to an increased health risk.

Oxygen permeability

The higher permeability of silicone means that the oxygen permeability of silicone hydrogel lenses is not tied to the amount of water in the lens.

For the wearer, this means increased comfort, and the ability to wear the lenses continuously for an extended period of time. Studies have also shown that any infections that do occur tend to be less severe than with traditional Hydrogel lenses.

Contact lenses for dry eyes

Whilst they are not perfect, there is no denying that Silicon Hydrogel represents a major step forward in contact lens technology, and it is no coincidence that the market has been heading in this direction for some years now.

Whilst they may not be for everyone, almost any contact lens wearer is in a position to try them out, though we will always recommend that you consult your optician before switching your contact lenses.

People who stand to benefit the most from Silicone Hydrogel contact lenses are those who tend to wear their lenses for more than twelve hours a day, particularly if they spend a lot of time in low humidity environments (offices with air-conditioning is one example of this).

Patients with high prescriptions, or younger people who haven’t yet got the hang of their contact lens wear and maintenance routine, will also benefit, as will anyone who regularly experiences dryness, redness, or any other discomfort towards the end of a day wearing traditional contact lenses.

Silicone Hydrogel Contact lenses come in a variety of brands and different duration of wear. Many Silicone Hydrogel lenses have been approved for overnight wear for up to seven nights, and there are even pairs that can be worn for up to 30 nights continuously.

DID YOU KNOW?

Silicone hydrogel lenses cause less irritation than other types of contact lenses when worn for long periods.

How to choose the right contact lenses

What are the differences between daily and monthly contact lenses? Choosing the right contact lenses for your needs comes down to two main things, your prescription and lifestyle.

Daily contact lenses are typically thinner than monthly contact lenses and have high water content. 1 day silicone hydrogel contact lenses should for example be word for around 12 hours a day and then removed overnight to let the eyes rehydrate. Residue from the eye easily build up and affects the quality of the lens.

Therefore, daily contacts should be disposed of and not reused after wearing them. If you play sports or engage in outdoor activities, daily contact lenses may be the better option for you as the lenses are likely to be exposed to dirt and can be replaced daily.

Monthly lenses are thicker and durable, making them more long-lasting. They do not dry out as easily if properly taken care of and stored and can therefore be reused multiple times. Your vision correction needs is important when choosing contact prescription lenses.

Since monthly contact lenses are made with a harder composition, they are more suitable for prescriptions that require higher magnification.

If you have a complex prescription, monthly lenses are typically more suitable for you. If you have sensitive or dry eyes, silicone hydrogel contact lenses are a good option and together with your eye doctor you can discuss the perfect fit for your needs.

At SmartBuyGlasses, we stock a wide range of the leading brands of silicone hydrogel lenses, including Acuvue Oasys, PureVision 2 and Air Optix. Check out all the silicone hydrogel lenses available on our website here.

The Different Lens Packages We Offer

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The Different Lens Packages We Offer

We have many lens index options for prescription eyewear. These are our essential and clarity options.

When purchasing eyewear, it’s important to choose the right kind of lens. This will depend on your prescription and lifestyle, but it’s hard to make a choice without understanding the different glasses lens types and how they play into your needs.

There are many factors involved when choosing lenses, but one of the most important ones is the lens index. Alongside this, materials and available lens coatings can also impact your decision.

What is lens index?

Lens index, also known as refractive index, is a measurement that indicates how efficiently the lens bends light as it passes through it. As the lens index value increases, the lens becomes thinner.

Which lens index is right for you will depend on the SPH, CYL, ADD and Prism values on your correct prescription.

The CYL won’t always be present on the prescription as it indicates the power of your astigmatism correction. If you don’t have a CYL on your prescription, it means you don’t have astigmatism.

The SPH instead indicates the amount of lens power prescribed for (-) or (+), this is your SPH correction. The SPH value is present on all prescriptions except for those which only have astigmatism correction, which only have a CYL.

These values will help you determine which lenses are right for you. Though lower-index lenses are more affordable, they are only suitable for lower power correction requirements and if chosen for high power prescriptions, they can be uncomfortable due to their thickness.

High-index lenses are instead more versatile. As they are thinner, they tend to be more comfortable, and they can cater to a wider range of prescriptions. This makes them the right choice for both high-prescriptions and people looking for a more aesthetically pleasing option.

That said, as the index impacts the depth of tint they may not be the best solution for certain kinds of prescription sunglasses.

Lens material

The available lens materials have different physical properties and features. To understand what the ideal choice is for your eyeglasses, it’s best to know what they are.

Plastic

Plastic eyeglass lenses are one of the most common types of lenses. Our plastic lenses are made in either CR-39 plastic or polycarbonate.

CR-39 plastic is the standard glasses lens material. It offers good vision correction for refractive errors and blocks out 80% of UV light.

It’s also lighter than glass, though at the same thickness it has a lower refractive index than alternatives in other materials. This is why it’s best to avoid certain frame shapes and higher prescriptions. That said, they are still thinner than glass.

Polycarbonate lenses were introduced as an alternative to CR-39 plastic. They are thinner and more lightweight than other plastic alternatives, which makes them more impact resistant. That said, polycarbonate scratches easily so they require scratch-resistant coating for durability.

High-index materials

The MR series (MR7, MR8, MR10 and MR174) is a line of optical materials with high refractive index. This makes it possible to get thinner lenses with the same prescription strength as thicker lenses, making them good lenses for high prescriptions.

MR8 has a refractive index of 1.6 and is the standard high index material. It offers minimal chromatic aberration in the visual periphery, alongside impact and thermal resistance. This makes it well suited to a wide range of purposes.

MR7 is at the forefront of modern lens technology. With a refractive index of 1.67, it is 15% thinner than the MR8 alternative. It also offers high tintability, making it ideal for sunglasses and fashion-oriented glasses.

MR10 is similar to MR7. Its 1.67 index makes it just as thin and light, though it has less tintatibility. That said, it offers excellent thermal resistance which is why it’s recommended for a wide range of working temperatures.

Last but not least, the MR174 is the ultra thin lens of the MR series. With its refractive index of 1.74, it’s recommended for those looking for extra thinnes. For example, they are recommended for the geometric glasses shapes, and with the memory metal used in rimless frames.

MR174 is also a good choice for the eco-conscious as it’s made entirely of plant-derived materials.

Our essential lenses

Here at Smartbuyglasses, we offer essential lenses, ranging from a lens index of 1.5 to 1.74. Our premium collection is in lightweight plastic and offers a range of available add-ons and coatings.

1.5 lens index

Our 1.5 index lenses are recommended for prescriptions between SPH +/-2.75 and CYL +/-2.00. We offer them as part of our standard/value and comfort/standard packages.

These are standard affordable single-vision lenses. They’re made in CR-39 plastic and can come with scratch resistant and anti-reflective coatings, which makes them more durable and helps them reduce glare for better visual clarity. You can also get a series of add-ons, like zFORT® blue light blocking and Transitions®.

Lens index: basic 1.5
Material: plastic (CR-39)
Coatings: scratch resistant, anti-reflective

Available add-ons: zFORT® blue light blocking, Transitions®,tints, polarization, mirror finish

Our silver/standard package is our recommended option for non-prescription lenses.

1.59 lens index

Our 1.59 index lenses are 22% thinner than our basic 1.5 lenses. We offer them as part of our polycarbonate package.

They are made in polycarbonate and come with scratch resistant, anti-reflective and UV400 coatings, making them a great option for those who spend a lot of time outdoors and need to keep their eyes shielded from the sun’s harmful UV rays.

Lens Index: basic 1.59
Material: plastic (polycarbonate)
Coatings: scratch resistant, anti-reflective, UV400

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

1.61 lens index

Our 1.61 index lenses are recommended for prescriptions between SPH+4.25 to -5.00 and CYL +/-3.00. As this lens is 25% thinner than our basic lens, it is more comfortable and easier to fit to frames.

They are part of our thin & light/comfort package and come with both scratch-resistant and anti-reflective coatings. They also have UV 400 protection.

Lens Index: basic 1.61
Material: high-index (MR8)
Coatings: scratch resistant, anti-reflective, UV 400

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

The gold/comfort package is our recommended essential option for reading, distance and progressive lenses.

1.67 lens index

Our 1.67 index lenses are very thin, 40% more than our basic 1.5 lenses. We offer them as part of our ultra/premium package which is recommended for prescriptions between SPH+7.00 to -8.00 and CYL +/-4.00.

They are aspheric, which means they have a flatter curve to reduce central thickness. This makes them both more comfortable and easier to fit to frames.

They also come with scratch resistant and anti-reflective coatings, alongside UV 400 protection. And that’s not all, they have a superhydrophobic coating that repels water to keep your lenses clear!

Lens Index: thin 1.67
Shape: aspheric
Material: high index (MR7 & MR10)
Coatings: scratch resistant, anti-reflective, UV 400, superhydrophobic

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

1.74 lens index

Our 1.74 index lenses are our thinnest lenses. They are 60% thinner than our basic 1.5 lenses and recommended for prescriptions between SPH+10.00 to -14.00 and CYL +/-6.00.

Just like our premium 1.67 lenses, they come with the same coatings and are aspheric for maximum comfort. They are part of our deluxe/premium plus package.

Lens Index: ultra thin 1.74
Shape: aspheric
Material: high index (MR174)
Coatings: scratch resistant, anti-reflective, UV 400, superhydrophobic

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

DID YOU KNOW?

Mitsui Chemicals started developing the MR lens materials series in 1982.

Our clarity lenses

Our Arise Collective™ Clarity collection has been designed to provide breakthrough lens technologies, optimized visual acuity and state-of-the-art protection for any prescription and frame.

Geared towards clarity, comfort, and durability, they are made both for everyday wear and those who need advanced protection. All our clarity lenses are aspheric and come with Impact X protection designed to withstand the toughest impact.

They also offer UV 400 protection and are scratch resistant, anti-reflective and superhydrophobic.

1.5 lens index

Our clarity 1.5 index lenses are the perfect fit for those with prescriptions between SPH +/-2.75 and CYL +/-2.00. They are part of our Clarity Active-X/Clarity HD package, which is our recommended clarity option for no prescription lenses.

Lens Index: thin 1.5
Shape: aspheric
Material: plastic (CR-39)
Coatings: scratch resistant, anti-reflective, UV 400, superhydrophobic, impact X

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

1.61 lens index

Our clarity 1.61 index lenses are a great fit for those with prescriptions between SPH+4.25 to -5.00 and CYL +/-3.00.

They are part of our Clarity Pro-X/Clarity 4K lens package and are our recommended clarity lens for reading, distance and progressive lenses.

Lens Index: thin 1.61
Shape: aspheric
Material: high-index (MR8)
Coatings: scratch resistant, anti-reflective, UV 400, superhydrophobic, impact X

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

1.67 lens index

Our 1.67 index lenses are best suited for those with prescriptions between SPH+7.00 to -8.00 and CYL +/-4.00. They are part of our Clarity Ultra-X/Clarity 8K package.

Lens Index: thin 1.67
Shape: aspheric
Material: high-index (MR7 & MR10)
Coatings: scratch resistant, anti-reflective, UV 400, Superhydrophobic, impact X

Available add-ons: zFORT® blue light blocking, Transitions®, tints, polarizations, mirror finish

Progressives

Progressive lenses are lenses that can accommodate multiple prescriptions in a single pair of glasses. These lenses have three different vision areas which are then used for near, intermediate and distance vision.

Our Arise Collective™ Clarity progressive lenses are an elevated design, with up to a 30% wider viewing field for increased comfort and quicker adaption time when transitioning between each prescription. The benefits include:

Up to 30% wider viewing area
easier adaptation zone
impact coating for durability
maximum comfort

Regardless of prescription or lifestyle, there’s a lens for you. Explore our options and feel free to ask our opticians any questions if you still have doubts on the best solution! We’re here to make sure your glasses feel just right.

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Spherical Aberration

Spehrical aberration is when light rays pass through a spherical lens and do not all converge on the same point,...

How much are prescription glasses

This guide will help you understand the different prices of glasses.

Spherical Aberration

Spehrical aberration is when light rays pass through a spherical lens and do not all converge on the same point,...

Sunglasses Lens Color Guide

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Sunglass Lens Color Guide

Does the color of sunglass lenses matter? | Lens color recommendation by weather | Lens color recommendation by activity

By Corina Iatisin

Reviewed by

Updated On Mar 23, 2023

When buying a new pair of sunglasses and choosing the color of your lenses, remember that different lens colors have different purposes.

Depending on weather conditions or the activities that are part of your daily routine, the color of your lenses can enhance the overall performance of your glasses. Most people choose lens colors based on aesthetics, but did you know that different lens colors serve different purposes?

In this article, we will guide you through the different color options, explain the difference between each lens color and help you understand how to choose the best one to suit your needs.

Does the color of sunglass lenses matter?

Yes, color has a noticeable effect on the sunglasses. Depending on your lifestyle, lens color also affects your eye health during certain activities. This makes it essential for you to find a suitable lens compatible with your daily activities and needs.

What about mirrored lenses?

Mirrored sunglasses are the perfect stylish option to protect your eyes against UV rays. The fully reflective coating used for the lenses gives the mirrored look everyone loves these days. Combined with polarised lenses, they offer maximum protection against UV rays and increase clarity. Both polarized and mirrored lenses, either separate or combined, come in different colours. Below, we will be listing the most popular colours and what is the advantage of choosing each lens colour.

Lens color guide

Gray and black lenses are the best option if you’re looking for a neutral lens tint. These lenses are perfect for all weather conditions and are the top choice if you want to perceive colors in their purest form, even when wearing sunglasses.

Gray lenses are great at reducing the brightest glare and are perfect for outdoor activities and sports such as surfing, cycling, golfing and driving. If you’re looking for the everyday use type of tint, this is the one.

Amber and brown tints are extremely popular as they provide excellent depth perception. These lenses have a warm, reddish tone and are perfect for reducing glare, enhancing contrast, and helping maintain visual acuity. Amber and brown lens sunglasses are perfect for sunny days and outdoor activities such as fishing, shooting, tennis, or baseball.

Green Lenses are one of the trendiest when it comes to polarized or mirrored sunglasses. They are perfect for sunny days but also in low light conditions. Whether sunny, cloudy, or anything in between, green lenses will work amazingly well, giving you excellent vision and reducing glare.

Green lens sunglasses are one of the most popular ones for outdoor activities: no matter what sport you have on your agenda, these lenses will increase contrast and visual sharpness and enhance shadow.

Yellow lenses are more efficient in low-light environments like cloudy or rainy days. One of the benefits of using yellow lenses is that when playing sports, these lenses are great for focusing on moving objects. Another advantage is that when navigating, they are perfect in hazy or low-light conditions. Yellow lenses are also very popular amongst gamers as they filter blue light from computer screens and other screen devices.

Blue lenses are not only very trendy but also well-known for enhancing clarity and defining contours. These lenses improve colour perception and do wonders in low-light conditions. They’re suited well for all water sports, snow sports, and golf.

Red and pink tints increase contrast by blocking blue light and enhancing depth perception. They are also soothing for the eyes and more comfortable than others for longer wear times. Pink and red lenses perform their best on extremely sunny days and snowy conditions.

DID YOU KNOW?

Black lenses are perfect if you’re looking for a neutral lens tint while brown lenses provide excellent depth perception. Blue lenses are suited for all water sports. For rainy days, yellow lenses are a must!

Lens color recommendation by weather

Lens color recommendation by activity

Benefits of lens colors and tint

Now that you’ve read the guide to colored lenses for sunglasses, choosing the next pair won’t be so daunting. Whether you need the perfect pair for your winter sports or the bright sunlight of summer, you’ll have the right tinted sunglasses to suit all your vision needs.

How Can I Make My Glasses Anti-Reflective?

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How Can I Make My Glasses Anti-Reflective?

Anti-reflective (AR) coatings are a simple upgrade that can make a big difference in your vision and comfort.

As we’re all aware, the main function of glasses is to allow us to enjoy a clear, sharp field of vision, and therefore live life in greater comfort.

However, if you wear glasses regularly, you’re probably familiar with the annoying reflections and glare from lenses.

Modern lens technology has found smart solutions to fix this, and anti-reflective coating is one of them. Here, we’ll explain how it works and why it might be the perfect upgrade for your eyeglasses.

What is glare and how does it affect your eyesight?

Do you ever feel discomfort when looking directly at sources of light through your glasses? This could be due to glare.

Glare is defined as a strong, dazzling light. Although it often comes directly from a light source, it can also happen when light is reflected off an object, such as glass, water and certain metals.

Due to the glare we experience from highly reflective surfaces, viewing these objects closer to a light source becomes difficult.

What are anti-reflective glasses?

There are several types of coatings you can add to your eyeglass lenses to improve your viewing experience. These include impact resistance, hydrophobic, UV and blue light protection, and, of course, anti-reflective coatings.

Also known as anti-glare lenses, anti-reflective (AR) coatings reduce reflections on the outer surface of lenses by allowing more light to pass through them.

Have you ever been unable to see a person’s eyes due to the reflection on their glasses? These reflections are an aesthetic concern for some, especially in photos or video calls. AR coatings help eliminate these unwanted reflections, ensuring your eyes remain visible.

Beyond aesthetics, AR coatings also improve visual clarity. By allowing more light to pass through instead of bouncing it off, the halos that form around bright lights are removed from view, improving visual acuity as a result.

This can reduce eye strain in various conditions while making everyday activities more comfortable, such as driving at night and using digital devices.

While some retailers use the term “anti-glare coating,” it’s important to note that the correct terminology is “anti-reflective coating.” If you’re looking for a lens technology that only reduces glare, polarized lenses are the best solution, although they are only available for sunglasses.

How does an anti-reflective coating work?

AR coatings are made of layers of metal oxides. Simply put, anti-reflective coating cancels out the light reflected on the surface of the lenses and allows more light to pass through them and reach your eyes.

The more light that reaches your eyes, the more clearly you can see. This is all achieved by a fairly complex scientific process called the optical interference model.

Basically, the layers of the anti-reflective coating work together to introduce “destructive” light waves, which, as their name suggests, destroy the reflection on the lenses.

Uncoated lenses allow about 92% of light to pass through them. Anti-reflective coating increases that number to 99%, giving the wearer greater visual acuity.

Caring for glasses with anti-reflective lenses

Contrary to what you may think, an anti-reflective coating can make your glasses easier to clean and care for. Most AR coatings give the lens surface a hydrophobic finish, which repels water and dirt, so the lenses don’t smudge so easily.

That said, you may have to clean them more frequently as dust is more visible on them. Like with any glasses, always use a microfibre cloth to clean instead of a t-shirt, tissue, or other materials that may cause tiny abrasions.

It’s also useful to wet the lenses beforehand to further protect them from the risk of friction-induced scratches.

Ask your optician to recommend which cleaning products can be safely used to clean your anti-reflective glasses. The harsh chemicals in some products can damage this type of coating.

Benefits of anti-reflective coatings

The most noticeable benefit of AR coatings is the improved appearance of the lenses. Without reflections, the wearer’s eyes are more visible, making conversation and eye contact in general easier.

For the wearer, the absence of reflections on their lenses is less distracting, especially in situations such as driving at night, working in a brightly lit environment, or in front of digital screens. As a result, your eyes are put under less strain.

AR lens coatings also improve visual acuity, meaning your vision will be sharper, thanks to the extra light getting through to your eyes.

This coating is particularly useful on high-index lenses, as these can reflect up to 50% more light than other lenses. This makes an AR coating almost essential for high-index prescription lens wearers.

When it comes to sunglasses, the dark lens tint generally negates the need for an AR coating on the outside of the lenses. However, it can still be applied on the inside of the lenses for greater comfort when the sun is behind you.

DID YOU KNOW?

Every anti-reflective coating gives the lenses it’s applied to a very subtle tint. This tint is most often either green, brown, or yellow.

Anti-reflective vs polarized lenses

Both AR coatings and polarized lenses greatly reduce glare, but the way they do it and the situations they serve best may differ.

As you now know, AR coatings allow more light to pass through the lens, reducing distractions from glare, improving visual clarity, and eye contact. They are helpful for everyday eyeglasses, and particularly beneficial for driving at night or digital device usage.

Polarized lenses, on the other hand, block horizontal light waves, which are responsible for creating glare from surfaces like water, road, and snow, providing the wearer with sharper vision. Best used in outdoor activities, these lenses are typically heavily tinted, making them unsuitable for regular eyeglasses.

If you spend a lot of time outdoors and participate in activities such as driving, fishing and skiing, polarized glasses may be a valuable addition for you. But if adding an extra coat of benefits to your regular prescription glasses is what you’re looking for, AR coating will be the best choice.

Either way, both options offer the valuable benefits of anti-glare, improving your visual comfort and clarity based on your lifestyle needs.

How can I make my glasses anti-reflective?

As is usually the case when it comes to eyewear choices, your own vision requirements and lifestyle will dictate what the best option for you is.

If, after reading this article, you believe anti-reflective lens coating is worth the investment, here’s how you can get your anti-glare glasses:

Explore our wide range of eyewear and find your favorite pair. Feel free to experiment with our Virtual Try-On Tool to see what frames look like on you before you buy.
When adding your new frames to the cart, click the “Choose Lenses” option.
Choose the type of lens you need, such as single vision, progressive or plano (non-prescription). Add your prescription details if you need lenses with corrective power.
Select a “Lens Package” with anti-reflective coating. All our lens packages aside from our free 1.5 index lenses include this.
Choose any additional add-ons and proceed to checkout.

And that’s, you’re anti-glare glasses will arrive in no time!

If you’re still unsure if AR coating is right for you, feel free to explore our Lens Hub or reach out to one of our opticians– they’re here to answer any questions and can help you make the best choice for your needs.

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Learn the truth behind common myths about sunglasses

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Learn why you may need polarized lenses and how to tell if your glasses already have polarization or not.

Anti-glare Glasses

Glare is a nuisance. That's why anti-glare glasses were developed. Find out about the different kinds and their benefits here.

Sunglasses: Myths and Misconceptions

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How to Tell if Your Sunglasses Are Polarized

Learn why you may need polarized lenses and how to tell if your glasses already have polarization or not.

Anti-glare Glasses

Glare is a nuisance. That's why anti-glare glasses were developed. Find out about the different kinds and their benefits here.

What To Know Before Ordering Contact Lenses

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What To Know Before Ordering Contact Lenses

Do you need prescription for contact lenses? | Contact lenses vs glasses | Contact lens prescription | How to read a contact lens prescription | How long do contact lens prescriptions last?

Contact lenses can be a supplement or an alternative to glasses, but you shouldn't order them based on your glasses prescription. This article walks you through the whole process.

Do you need a prescription for contact lenses?

The purchase of all types of contact lenses requires a valid contact lens prescription – which can’t be the same of your glasses prescription – written by a qualified eye care practitioner. This is true even for plano lenses with no vision correction purposes, colored contact lenses or special-effect lenses that are worn for cosmetic purposes only.

Your eye care practitioner can only write your contact lens prescription after a thorough contact lens eye exam and fitting.

Contact lenses vs glasses

There are a number of differences between glasses and contact lens prescriptions due to the differing nature of their vision correction. These differences range from the distance which they sit from your eye and the way in which they are regulated by official medical bodies, to the way they are designed for your optical needs.

You may notice that the values of your glasses prescription differ from those of your contact lens prescription. Don’t worry, your optician didn’t make a mistake. This difference is completely normal, and is due to that fact that glasses are worn about 12mm away from the surface of the eye, whereas contacts sit directly on the eye’s surface.

When a glasses prescription is decided after the eye exam, a mathematical calculation is then used to calculate the alterations that need to be made in order to create the correct equivalent contact lens prescription – also known as CL Rx.

DID YOU KNOW?

The main reason for the difference in prescriptions between contact lenses and glasses is the distance at which they sit away from your eyes.

Contact lens prescription

By the time contact lenses are ready to be fitted to your eyes they have gone through a number of additional criteria than those that are required for glasses. This is due to the fact that the Federal Drugs Agency (FDA) lists contact lenses as a medical device and so they are regulated differently to glasses.

Namely, contact lenses sit directly on the eye’s surface, and so there is a greater risk of developing infections/ulcers or other complications that are not present with eyeglasses.

Finally, when fitting contact lenses the curvature of the cornea, the transparent outer covering of the eye, upon which they sit must be taken into account. No two pairs of eyes are exactly the same.

The measurement of this curvature must be taken in conjunction with its diameter in order to ascertain the best match between the size and shape of your eyes and the size of contact lenses they will require.

How to read a contact lens prescription

Eye: OS (oculus sinister) refers to the left eye and OD (oculus dextrus) refers to the right eye. If you see OU, which is less common, this is referring to both eyes.

BC: Stands for Base Curve and relates to the curvature of the contact lens. The measurement usually stands between 8 and 10.

DIA: Stands for Diameter, and refers to the diameter of the contact lenses. This usually ranges from between 13 and 15 mm.

SPH: aka Power/PWR is the corrective element of the contact lenses. A negative number (e.g. -1.75) indicates myopia (nearsightedness), while a positive one (e.g. +2.25) indicates hyperopia (farsightedness). If you see PL it stands for plano, meaning that no correction is required.

CYL: Cylinder, is the level of astigmatism present, if you have any, and is measured in diopters.

AX: Axis, measured in degrees, refers to the placement of the lens in order to relieve the problem of astigmatism.

ADD: For bifocal contact lenses, this number indicates the degree of magnification to certain parts of each lens.

Color: Whether the lenses are tinted or not.

Brand: The optometrist or ophthalmologist will select a specific brand, or model within a brand, of lenses that will best match your optical requirements.

How long do contact lens prescriptions last?

Always be aware that contact lens prescription lasts only one or two years, and after this time has passed, it is no longer accepted as valid. As a result, when your contact lens prescription expires, you won’t be able to buy more lenses until your eye care practitioner update your contact lens prescription.

That’s why a new eye exam must be made at the point of expiration in order to maintain optimum eye health and comfort.

What Are Prescription Sports Glasses?

male cyclist wearing prescription sport glasses

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What Are Prescription Sports Glasses?

Prescription sports glasses provide the perfect mix of protection, comfort, and sharp vision for athletes of all levels.

Imagine gearing up for a big game or heading out for a long run, and as you lace up your shoes, your glasses slip down your nose.

Whether it’s soccer, cycling, skiing, or any sport where clear vision is critical, traditional eyeglasses often fall short.

That’s where prescription sports glasses come in—a practical solution for athletes, combining protection, comfort, and sharp vision.

These specialized glasses offer a lot of benefits and are a game-changer for sports enthusiasts.

Benefits of prescription sports glasses

Prescription sport glasses aren’t just a nice-to-have—they’re essential gear for anyone who needs optimal vision while staying active.

On the field, on the slopes, or biking through tough terrain, these glasses can make a big difference and here’s why:

Eye protection

When you’re playing sports, your eyes are exposed to risks that you wouldn’t face in everyday life.

From fast-moving balls to sudden impacts, your eyes are vulnerable.

When adding prescription lenses to your sports glasses, be sure to add polycarbonate lenses since not all lenses offer these safety features.

Polycarbonate lenses are not only lighter and thinner than plastic or glass lenses, but also shatterproof and scratch-resistant, which provide extra durability and protect your eyes from injuries.

Some frames come with side shields for additional protection from unexpected angles.

UV protection

If you play sports outdoors, your eyes are constantly exposed to UV rays from the sun.

Ultraviolet (UV) rays are radiation emitted by the sun, which can harm your eyes long-term and even lead to eye conditions like cataracts or macular degeneration.

Prescription sports glasses often come with lenses that block 100% UVA and UVB rays, helping to reduce eye strain and shield your eyes from sun damage during activities.

For even more sun protection, prescription sports sunglasses are an excellent option.

They not only offer the same vision correction and impact resistance as regular sports glasses but also provide a darker tint to reduce glare in bright conditions.

UV protection ensures your eyes stay safe and healthy while you’re under the midday sun, playing soccer, or hitting the slopes.

Enhanced comfort

Comfort is crucial when playing sports, and regular glasses often don’t make the cut.

They can slip, break, or fail to provide the protection you need during sports, making them more of a distraction than a help.

Prescription sports glasses are designed with lightweight frames and often feature rubber grips on the nose and temples to keep them securely in place.

To improve your sports experience, you can opt for high-index lenses, which are thinner and lighter than traditional lenses.

High-index lenses are great for people with a higher prescription, making them ideal for runners, cyclists, or everyday use.

DID YOU KNOW?

Military eyewear was the original inspiration for prescription sports glasses to protect soldiers’ eyes in challenging conditions.

Improved visual contrast

Seeing clearly isn’t just about correcting your vision—it’s about seeing the finer details in your environment.

Anti-reflective coatings reduce glare and reflections, enhancing visual clarity, especially in bright conditions.

Polarized lenses are a go-to feature for minimizing glare from surfaces like water, snow, or wet roads, while lens tints can improve color contrast and reduce eye strain.

For example, tennis players can track the ball more easily when glare is minimized, and the ball stands out from the background.

Photochromic lenses are another option because these lenses adjust automatically to changing light.

This makes them ideal for cycling or running as they provide clearer vision when moving between shaded and light areas.

Better vision & performance

Overall, sports frames with prescription lenses protect your eyes and can help prevent long-term eye injuries caused by exposure to wind, dust, and UV rays.

If you’re an athlete and need vision correction, prescription sports glasses are essential to your performance as they allow you to track movements, spot details, and react faster.

They are a practical solution to not only see better but also feel safer and more confident.

How to find the right prescription sports glasses

Before you get your first prescription sports glasses, here’s what to consider when shopping for the perfect pair:

Frame material: Look for lightweight, impact-resistant materials like polycarbonate or TR90.
Lens type: Consider polarized, photochromic, or tinted lenses depending on your sport and lighting conditions.
Fit: Choose adjustable nose pads and temple grips for a comfortable fit that prevents your glasses from slipping.
Straps: Many sports glasses come with straps to keep them secure during intense movement.
Ventilation: Choose frames with built-in vents to prevent fogging.
Lens coatings: Opt for anti-reflective or scratch-resistant coatings for added durability and clarity.
UV protection: Make sure the glasses provide 100% UVA and UVB protection.

Why you need prescription sports glasses

Prescription sports eyewear is crucial for your eye health and performance for professional athletes and sports enthusiasts.

They help protect your eyes and make your playing environment safer, similar to other essential sports gear such as helmets or padding.

With these glasses, you can enjoy complete visual clarity and be able to focus fully on your game, your workout, or the road ahead without worrying about your eyeglasses slipping or breaking.

If you’re interested in learning more about prescription glasses and eye care, visit our Optical Center.

Feel free to get in touch with our in-house opticians if you have doubts about what lenses and lens add-ons best suit your needs.

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What Is the Difference Between Nearsighted and Farsighted?

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What Is the Difference Between Nearsighted and Farsighted?

Difference and symptoms

The terms "nearsighted" and "farsighted" cause some confusion. This articles will help you understand each condition better.

Nearsightedness, or myopia, results in blurred vision when the light that the eye sees is focused in front of the retina, rather than directly on it. It also occurs when the physical length of the eye is greater than the optical length – the size of your eyes can directly affect your vision. For this reason, nearsightedness often develops in rapidly-growing children or teenagers. As they grow, it can progress even further, requiring frequent changes in glasses or contact lenses.

To summarize, a nearsighted person sees nearby objects clearly, while objects in the distance are blurred.

Symptoms:

Blurry vision when looking at distant objects.
The need to squint or partially close the eyelids to see clearly.
Headaches caused by eye strain.
Difficulty seeing while driving a vehicle, especially at night.

Nearsightedness is often first detected during childhood and is commonly diagnosed between the early school years through the teens. A child with nearsightedness may:

Persistently squint.
Need to sit closer to the television, movie screen or the front of the classroom.
Seem to be unaware of distant objects.
Blink excessively.
Rub their eyes frequently.

Farsightedness, or hypermetropia, is the result of light being focused behind the retina rather than directly on it. It may be caused by the eyeball being too small or the focusing power being too weak. Farsightedness is often present from birth, but children can often tolerate moderate amounts without difficulty and most outgrow the condition. A farsighted person sees faraway objects clearly, while objects that are near are blurred.

To summarize, a farsighted person sees far-away objects clearly, while nearby objects are blurred.

DID YOU KNOW

Nearsightedness is also referred to as shortsightedness,while it’s medical name is myopia.

Farsightedness is the common name for hyperopia, which is sometimes also called hypermetropia.

Symptoms:

Nearby objects may appear blurry.
Needing to squint to see clearly.
You have eye strain, including burning eyes, and aching in or around the eyes.
You experience general eye discomfort or a headache after doing close tasks, such as reading, writing, computer work or drawing, for an extended period of time.

The best ways to counteract the effects of distance-related vision issues are with high-quality glasses and contact lenses, like the huge range available at SmartBuyGlasses.

If you have an eye condition where you experience myopia and hyperopia, multifocal lenses are required. These lenses can combine multiple prescription powers so you can see both near and far. Bifocal and multifocal lenses can also be useful for conditions such as presbyopia.

Where is My Pupillary Distance on My Prescription?

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Where is My Pupillary Distance on My Prescription?

How to find it

You'll need your pupillary distance (PD) to buy prescription glasses online. Here is where you can find it on your prescription.

Pupillary distance (PD) is the distance between your two pupils. Near PD is the distance between your pupils when you’re looking at an object closeby, because your pupils are closer together. You can read all about pupillary distance here in our Optical Center article.

Your pupillary distance is not always mentioned in your prescription, but if it is, it will be indicated by ‘PD’

The average PD for adults is 63 mm and the average near PD is 60 mm. Near PD is usually measured as (PD – 3 mm). For children, the average PD is between 42 and 54 mm.

You can also measure your PD yourself: find out how to do this here.

DID YOU KNOW

If you have the wrong pupillary distance measurement, your glasses might cause blurriness, headaches, or eye strain.

How to Clean Sunglasses?

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How to Clean Sunglasses?

Step by step guide

Sunglasses lenses can get dirty andsmufged very easily. here's how to get them spotless again.

You should use warm, running water, dish soap and a lint-free cloth to take optimal care of your sunglasses. Don’t clean your lenses with your breath or your t-shirt, these common techniques will only leave your lenses with scratches. Here is what you should do instead:

Hold your glasses under a running tap of water to moisten them
Use one drop of dish soap on your lenses and gently massage it and swirl it around using your fingers
Rinse the glasses again under the running water
Dry gently with the lint-free cloth

Note that you can also use a lens-cleaning spray instead of the soap, just make sure they are right for your type of lenses.

If you’re looking for a pair of sunglasses, look no further! Check out our designer eyewear at How to Clean Sunglasses?
SmartBuyGlasses.

DID YOU KNOW

There are a lot of lens-cleaning sprays which work well, but make sure you use one that is suited to your specific type of lenses.

How to Pick The Most Comfortable Eyeglasses for You – a 5 Step Guide

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How to Pick The Most Comfortable Eyeglasses for You - a 5 Step Guide

Given how much time we spend wearing our glasses, it's essential that they're comfortable in terms of both fit and vision.

Glasses are almost like an extension of our body, so finding the perfect and most comfortable fit can be a life changer.

There are many things to consider when choosing your first pair of glasses or even a brand-new model to freshen up your prescription or look.

This article is here to guide you in ensuring you get the most comfortable and perfect pair for your needs.

1. What type of eyeglasses do you need?

Before diving into the aesthetics, the first step is to ensure your eyeglasses serve their primary function – improving your vision. This starts with a current and accurate prescription for your prescription lenses.

Next, consider the type of lenses that your lifestyle and vision need. Options include:

Single-vision lenses for nearsightedness or farsightedness.
Progressives for those requiring multiple focal points.
Reading glasses for those with presbyopia.
Prism lenses to correct vision disorders like double vision.
Plano lenses to change up your look without affecting your vision.
Prescription sunglasses to provide UV protection and correct your vision.

Additionally, lens add-ons and coatings such as anti-glare and blue light filtering can be crucial for comfort, especially if you spend significant time in front of digital screens.

2. Determine your face shape

The second thing to consider is your face shape. As you can see in the image below, there are different types of face shapes.

Knowing yours is crucial to finding the frame shape that will fit your face perfectly without any discomfort.

Go to our dedicated page to find out your face shape and get frame recommendations.

In general, it’s important to match your face shape with the right frames to ensure the weight of the frame is distributed correctly on your face, without any pressure points on the temples, nose, or cheekbones.

The goal is to find eyeglasses that feel as if they’re barely there!

3. Know your measurements

If you know your face measurements, you’re one step closer to finding the perfect pair! To be prepared, follow this measuring your face for glasses guide.

Key measurements to know include frame width, lens width, temple length, and bridge width.

DID YOU KNOW?

There is no one-size-fits-all option when it comes to maximizing the comfort of your glasses; they need to match your specific requirements.

4. The importance of the nose bridge

Your perfect pair should have the right nose bridge to fit your facial features and measurements. This refers to the horizontal distance between the two lenses.

The size and type of bridge play a role in how the weight is distributed over your nose, hence impacting how comfortable your eyeglasses are. Here are a few simple rules:

The frames should never feel too tight on the nose.
There can be a slight gap between the bridge of the glasses and your nose.
If the eyeglass bridge is too wide, the glasses will slide down.
If the bridge is too narrow, it’ll lead to a lot of pressure on the sinuses.

Additionally, if you have a low nose bridge, you can opt for Asian-fit glasses.

These are designed with a shallower nose bridge and a wider front and are an excellent alternative for those who struggle with glasses slipping down their nose.

5. Consider your personality and lifestyle

Another key factor to consider is your lifestyle and personal style.

Eyeglasses that align with your lifestyle can significantly enhance wearability, prevent discomfort, and even protect your eyes in various environments.

For an active lifestyle: If you’re constantly on the move, involved in sports, or enjoy outdoor activities, look for eyeglasses that promise durability and flexibility. Materials like polycarbonate are not only impact-resistant but also lighter than traditional plastic, reducing the strain on your nose and ears throughout active use.
For the digital native: If you spend considerable time in front of computers or digital devices, consider lenses with blue light filtering capabilities.
For the fashion-forward: If expressing your personal style through eyewear is your priority, you’ll find that comfort doesn’t have to be sacrificed for fashion. Look for frames that balance style with ergonomic features. For instance, lightweight materials such as acetate can offer both a chic look and a comfortable fit.

More tips for the most comfortable glasses fit

The examples listed above are just some of the many combinations of materials, lenses, models, add-ons, and coatings available to create your personalized pair of glasses.

Some other tips for the most comfortable fit:

If the frames are too large, it will be very evident – they won’t even sit on your face and will slide down your nose. Conversely, if they’re too small, they might pinch the cheeks and even lead to headaches.
Wearing glasses with headphones can be quite uncomfortable. If earphones just don’t cut it and you’re a headphones addict, consider thin-frame glasses to optimize noise cancellation.
Familiarize yourself with DIY methods of adjusting eyeglasses that don’t fit perfectly so that you can save yourself a trip to the optician and keep feeling comfortable with your new eyeglasses.
Wearing new glasses requires a period of adjustment. During the initial days, it is normal to experience mild headaches and tiredness in the eyes.

The point is for your eyeglasses’ shape and size to be in harmony with your face and skin tone, bringing about an overall balanced look.

If you need more guidance on how to choose your glasses, you can contact one of our certified in-house opticians.

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