They can also be reduced dramatically by using an aspheric element, but these are more complex to grind than spherical or cylindrical lenses.
32.
Although this was theoretically proven by Ren?Descartes in 1637, the grinding and polishing of aspheric glass surfaces was extremely difficult and expensive.
33.
Further research and development is being conducted to determine if the mathematical and theoretical benefits of aspheric lenses can actually lead to better vision correction.
34.
These are wide-angle lenses of a 6-element, 5-group aspheric design, which give a 105?angle of coverage.
35.
A lens is made of two curved surfaces, and an aspheric lens is a lens where one or both of those surfaces is not spherical.
36.
Bausch and Lomb developed in 2004 the first aspheric IOLs which provide better contrast sensitivity by having their periphery flatter than the middle of the lens.
37.
Aspheric eyeglass lenses allow for crisper vision than standard " best form " lenses, mostly when looking in other directions than the lens optical center.
38.
The use of a null corrector in the test can remove the aspheric component of the surface and allow testing using a flat or spherical reference.
39.
Even though this technically requires an " aspheric " lens, " aspheric " and " atoric " are reserved for lenses which correct errors induced by cosmetic lens flattening.
40.
Even though this technically requires an " aspheric " lens, " aspheric " and " atoric " are reserved for lenses which correct errors induced by cosmetic lens flattening.
