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Sunglasses offer protection against excessive exposure to light, including its visible and invisible components. The most widespread protection is against ultraviolet radiation, which can cause short-term and long-term ocular problems such as photokeratitis (snow blindness), cataracts, pterygium, and various forms of eye cancer. [26]
We spoke to two optometrists and the vice president of membership at The Vision Council to identify a handful of great polarized, UV-protected sunglasses for a reasonable price.
Polaroid Eyewear manufactures polarized sunglasses and polarized lenses, as well as optical frames, reading glasses, and clip-on lenses. Polaroid Eyewear was a part of the StyleMark group and sold to the Safilo Group in November 2011. Polaroid headquarters is located in Padua (Italy).
The main purpose of sunglasses has been, and still is, protection from the Sun's damaging UV rays. Throughout history, progression of the sunglasses began to change to serve more as a fashion stable, than eye wear for sun protection. The term "Sunglasses" began being used around the 1900s.
Antireflective ophthalmic lenses should not be confused with polarized lenses, which are found only in sunglasses and decrease (by absorption) the visible glare of sun reflected off 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 ...
This coating corrects for the difference in geometric phase between s- and p-polarized light so both have effectively the same phase shift, preventing image-degrading interference. [ 7 ] From a technical point of view, the phase-correction coating layer does not correct the actual phase shift, but rather the partial polarization of the light ...