What it means and why
Some light reflects whenever it meets a lens surface. An anti-reflective coating uses carefully designed thin layers to reduce selected reflections, so more useful light can pass through. It does not remove every reflection at every angle or wavelength.
This surface function differs from scratch resistance, water repellence and the lens prescription. A product may combine several treatments, but one feature cannot establish the presence or quality of the others. A faint residual reflection is not, by itself, proof that a lens is uncoated.
A worked example
During a video call, reflections of a room light may obscure the eyes. A suitable coating can reduce surface reflections, but the light position and viewing angle still matter. Changing the room light is a different intervention from changing the prescribed lens power.
What it does not tell you
“Anti-glare” is not a promise of safe night driving. Persistent glare may also involve the eye, a scratched lens or other conditions. Ask what the coating claim actually measures.
THINK IT THROUGHAre anti-reflective and scratch-resistant the same treatment?
No. One concerns light reflected at the surface; the other concerns resistance to damage. A lens may include both.
Sources & reading notes
Page updated:
- ZEISS · Lens coatings (manufacturer explainer) ↗ Manufacturer information
Documents the maker’s specifications or positioning for a market; it does not establish independent superiority or personal suitability.