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Opticians dispense "anti-reflection lenses" because the decreased reflection makes them look better, and they produce less glare, which is particularly noticeable when driving at night or working in front of a computer monitor. The decreased glare means that wearers often find their eyes are less tired, particularly at the end of the day. Allowing more light to pass through the lens also increases contrast and therefore increases visual acuity.

Antireflective ophthalmic lenses should not be confused with polarized lenses, which decrease (by absorption) the visible glare of sun reflected off of surfaces such as sand, water, and roads. The term "antireflective" relates to the reflection from the surface of the lens itself, not the origin of the light that reaches the lens.

Many anti-reflection lenses include an additional coating that repels water and grease, making them easier to keep clean. Anti-reflection coatings are particularly suited to high-index lenses, as these reflect more light without the coating than a lower-index lens (a consequence of the Fresnel equations). It is also generally easier and cheaper to coat high index glasses.

There are two separate causes of optical effects due to coatings, often called thick film and thin film effects. Thick film effects arise because of the difference in the index of refraction between the layers above and below the coating (or film); in the simplest case, these three layers are the air, the coating, and the glass. Thick film coatings do not depend on how thick the coating is, so long as the coating is much thicker than a wavelength of light. Thin film effects arise when the thickness of the coating is approximately the same as a quarter or a half a wavelength of light. In this case, the reflections of a steady source of light can be made to add destructively, and hence reduce reflections by a separate mechanism. In addition to depending very much on the thickness of the film, and the wavelength of light, thin film coatings depend on the angle at which the light strikes the coated surface.

source: Wikipedia

 

  Top layer is Hydrophobic, that is easy to clean on newer lenses

 

 

The problems is 2 years down the road..........................when the lenses have some scratches, a delaminating coating and could still be useful if someone could fix them up. As long as the warranty was valid they got fixed up or even exchanged.  For many retailers that is a good reason to sell you a new pair.

These lenses can be saved without having to purchase new ones.

 

If you can not find a local source to strip your defective coating you can do it on line

 

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