Reflection by index
At normal incidence a surface reflects ((n−1)/(n+1))² of the light. That is about 4% for a 1.50 lens and roughly 6% to 7% for 1.67 and 1.74 materials, per surface.
Fresnel equationEyeglasses and Optical · Lens Coatings
Anti-Reflective and Specialty Coatings The upgrade patients see in the first five minutes.
Coatings decide how clean, clear and durable a finished lens feels on the face. An anti-reflective stack, a hard coat and an easy-clean top layer turn a good material into a lens patients notice, and they give the optical a clear, explainable upgrade.
≈4%Reflected per surface, uncoated 1.50 lens
≈7%Reflected per surface, uncoated 1.74 lens
2Surfaces on every lens to treat
MultiLayers needed to cut glare across the visible range
How it works
Thin films that cancel reflections
An anti-reflective coating is a stack of very thin layers. Each layer creates a second reflected wave that is out of phase with the first, so the two partly cancel. One layer works at a single wavelength; several layers spread the effect across visible light.
Quarter-wave layers
A coating layer a quarter-wavelength thick, with a lower index than the lens, puts the two reflections 180 degrees out of phase.
HyperPhysicsMultilayer stacks
Single layers only zero out one wavelength, usually mid-spectrum. Multilayer stacks reduce loss over the whole visible range.
HyperPhysicsTop and hard coats
Commercial stacks sit on a scratch-resistant hard coat and finish with a smooth top layer that sheds water and smudges for easier cleaning.
Coating families from the major lens makers
Every major lens company sells its own premium stack. Names change by tier, but the families are stable.
- Anti-reflective with easy-clean top coat
- Blue-violet reflecting variants
- Sun and mirror coatings for Rx sunwear
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Essilor
Crizal is the Essilor anti-reflective family, sold alongside Varilux, Eyezen and Transitions in the EssilorLuxottica portfolio.
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ZEISS
DuraVision coatings, including DuraVision Plus BlueProtect for screen use, a DriveSafe coating for headlight glare, and DuraVision Plus Sun, Mirror and Flash Mirror for sunwear.
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HOYA
Super HiVision Meiryo EX4, the Super HiVision EX3 family, Recharge and HiVision View Protect appear in the current HOYA US comparison guide.
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Shamir
Glacier PLUS, Glacier Expression, Glacier PLUS Metaform and Glacier SUN make up the Shamir coating line.
In the optical
Presenting coatings without a sales pitch
Patients respond to what they can see. A quick side-by-side demo usually does more than a feature list.
Show the difference
Hold a coated and an uncoated demo lens under the dispensary lights. Reflections and the wearer’s eyes behind the lens tell the story.
Tie it to the material
High-index lenses reflect more light per surface, so recommend the coating together with the material rather than as a later add-on.
Send home a care kit
Coatings last longer with the right cleaner and cloth. Lens cleaner, wipes and anti-fog products are simple add-ons at checkout.
Reference and care notes
Reflection per surface by index (normal incidence)
| 1.50 (CR-39) | About 4.0% |
|---|---|
| 1.53 (Trivex) | About 4.4% |
| 1.59 (polycarbonate) | About 5.2% |
| 1.60 | About 5.3% |
| 1.67 | About 6.3% |
| 1.74 | About 7.3% |
Care guidance to give patients
- Rinse grit away before wiping, then clean with a lens cleaner made for coated lenses and a microfiber cloth.
- Avoid shirt tails, paper towels and household glass cleaners, which can scratch or degrade coatings.
- Use a hard case when glasses are not on the face.
About the numbers
Reflection values are calculated from the Fresnel equation for light hitting the surface straight on, in air, without any coating. Real lenses vary with coating design, wavelength and viewing angle. Manufacturer performance claims should be taken from each brand’s current literature.
Common questions about lens coatings
Why recommend AR on high-index lenses?
Higher-index materials reflect more light at each surface, so an uncoated high-index lens shows more glare and ghost images than standard plastic.
Does AR coating help night driving?
It reduces reflections off the lens itself. ZEISS also markets a DriveSafe coating aimed at headlight glare, which can be discussed with patients who drive at night.
Are blue-light coatings the same as AR?
They are AR stacks tuned to reflect part of the blue-violet range. See the blue light lens guide for what the evidence does and does not show.
Can an AR coating be repaired?
Coatings are applied at the lab when the lens is made, so a damaged coating generally means a new lens. Ask your lab about its coating warranty terms.
Should sunglasses get AR?
A back-side AR coat cuts reflections bouncing off the inside of a dark lens toward the eye, so it is worth offering on Rx sun lenses.
References
- Nave R. Anti-reflection coatings and multilayer coatings. HyperPhysics, Georgia State University. HyperPhysics
- ZEISS Vision Care US. Progressive lens tiers, DriveSafe, BlueGuard and DuraVision coatings. ZEISS
- HOYA Vision Care US. Product comparison guide: coatings and photochromics. HOYA
- Shamir. Lens, coating and material catalog. Shamir
- Essilor Pro. Varilux resources and brand navigation (Crizal, Eyezen, Transitions). Essilor
Make the coating part of the lens, not an afterthought
Recommend the stack with the material, demo it, and send patients home with the right care products.
Crizal, DuraVision, Super HiVision, Recharge and Glacier are trademarks of their respective owners. Coating names and tiers change; confirm current offerings with each manufacturer or your lab. Dispensing decisions rest with the eye care professional.