Modern glasses lenses do far more than correct your vision. Coatings can reduce glare, filter blue light from screens, protect against UV rays, resist scratches and fogging, and even adapt automatically to changing light. This guide explains what each coating actually does, whether the more debated ones (like blue light blocking) are worth it, and which combination suits your lifestyle.
Do Blue Light Glasses Actually Work?
Blue light is part of the visible light spectrum, high-energy and short-wavelength, emitted by digital screens, LEDs, and in much larger amounts, by the sun itself. Blue light blocking coatings filter out a portion of this light before it reaches your eyes.
Whether blue light glasses meaningfully protect your eyes is genuinely debated among eye care professionals. The American Academy of Ophthalmology has stated there’s currently limited clinical evidence that blue light from screens actually causes damage, and that eye strain from screen use is more likely caused by how we use screens (reduced blinking, poor posture, extended close focus) than by blue light itself.
That said, many people report the coating helps with visual comfort during long screen sessions, and it’s a low-risk, inexpensive addition if you find it helps you personally. You can read more detail in our guide on blue light and eye health here.
Anti-Reflection (Anti-Glare) Coating
Anti-reflection coatings, are also known as AR coatings, are designed to reduce glare, increase clarity, and improve visual comfort. They are particularly useful for night driving, long hours at a screen, and photography (since AR-coated lenses don’t reflect light back into photos the way uncoated lenses can).
AR coatings work via light interference: specific materials with certain refractive indices are layered together to cancel out reflected light at particular wavelengths. This increases light transmission through the lens and reduced the unwanted reflection that causes glare.
If you regularly drive at night, work long hours on screens, or simply notice glare bothering you, book an eye test with our team and ask about adding AR coating to your next pair.
UV Protection Coating
UV protection is essential for anyone spending significant time outdoors. Sun exposure to unprotected eyes can significantly increase the risk of eye conditions such as macular degeneration and cataracts. The College of Optometrists recommends UV-protective eyewear whenever you’re in strong sunlight.
UV protection coatings work by either absorbing or blocking harmful UV rays before they reach the eyes. Depending on the glasses, these coatings are induced in the lens or added as a layer.
To provide 100% UV protection, glass and plastic lenses must have UV coating applied. This is not necessary for polycarbonate, NXT, and most high-index plastic lens materials, as they block 100% UVA, UVB, and UVC without the need for added coatings.
UV Wavelengths Explained
UVC: Wavelengths below 280nm are filtered out by the ozone layer surrounding the Earth. The amount of absorption varies and is less near the equator and at high altitudes due to the reduced atmospheric thickness.
UVB: Wavelengths between 280nm and 315. These are responsible for sunburn and snow blindness. The amount of ultraviolet affecting a person is substantially increased by reflection from surfaces such as snow, sand, and water.
UVA: Possibly the most dangerous area, between 315nm and 380nm, causing chronic eye damage, especially with low-dose exposure over a long period of time.
If you’re choosing sunglasses specifically, our polarised vs non-polarised guide covers how polarisation works alongside UV protection in more depth.
Scratch-Resistant Coating (SRC)
All lightweight lens materials, plastic, polycarbonate, and high-index plastics, have a relatively soft surface and require an SRC applied to both sides of the lens. Glass lenses don’t require an SRC due to their natural hardness. Glass is, in fact, more scratch-resistant than most lightweight lenses with SRC applied.
Anti-Fog Coating (AF)
The anti-fog coating permanently bonded to the inside of the lens absorbs moisture before fog forms. It can fade over time with repeated cleaning of the inside of the lens. As an alternative, there are now many effective sprays and wipes that can be used to reduce lens fogging.
Hydrophobic Coating
A hydrophobic coating reduces surface tension, facilitating the runoff of water droplets from the lens surface. It reduces visual distortion arising when wearing glasses or sunglasses around water or in the rain. It also resists stains and repels grease and fingerprints, making cleaning your lenses quicker and easier.
Photochromic Treatment
Photochromic treatment, also known as transition lenses, is designed to adjust to the amount of light around you. These lenses darken when you step outside into bright sunlight and quickly turn clear again when you move indoors. Photochromic treatment can be added to any lens type, and it’s an excellent option for those who frequently move between indoor and outdoor environments. Our prescription sunglasses guide compares photochromic lenses against dedicated prescription sunglasses in full detail, including cost and which suits different lifestyles.
Lens coatings have real, practical advantages for improving vision, comfort, and lens longevity. But not every coating suits every person or lifestyle, and (as with blue light blocking) not every claimed benefit is equally well-supported by evidence. Consider your day-to-day activities when deciding which combination is right for you, and contact our team if you’d like personalised advice. If you’re specifically choosing sunglasses, our Sunglasses Lens Guide pulls all of this together in one place.
FAQs
Do Blue Light Glasses Actually Work?
The evidence is limited. Major eye health bodies, including the American Academy of Ophthalmology, haven’t found strong evidence that blue light from screens causes lasting eye damage, and much everyday eye strain is more likely caused by how we use screens than by blue light itself. Some people still find the coating improves visual comfort during long screen sessions.
Do I Need UV Protection on My Glasses If I Don’t Wear Sunglasses?
Yes, if your everyday lenses are glass or standard plastic. Materials like polycarbonate and high-index plastic block UV automatically, but other lens materials need a UV coating added to reach full protection.
Can I Combine Multiple Lens Coatings?
Yes, most coatings (anti-reflection, UV protection, scratch-resistant, anti-fog, hydrophobic) can be combined on the same lens. Photochromic and blue light coatings can usually be added too, depending on your prescription and lens material.
