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2. Bifocals - Wikipedia

   en.wikipedia.org/wiki/Bifocals

   Adaptation to the small field of view offered by the reading segment of bifocals can take some time, as the user learns to move either the head or the reading material rather than the eyes. Computer monitors are generally placed directly in front of users and can lead to muscle fatigue due to the unusual straight and constant movement of the ...

3. Sunglasses - Wikipedia

   en.wikipedia.org/wiki/Sunglasses

   Sunglasses can improve visual comfort and visual clarity by protecting the eye from glare. [24] The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water. They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface ...

4. Glasses - Wikipedia

   en.wikipedia.org/wiki/Glasses

   Typical sunglasses lenses are tinted for protection against bright light or polarized to remove glare; photochromic glasses are clear or lightly tinted in dark or indoor conditions, but turn into sunglasses when they come into contact with ultraviolet light. Most over-the-counter sunglasses do not have corrective power in the lenses; however ...

5. Polaroid Eyewear - Wikipedia

   en.wikipedia.org/wiki/Polaroid_Eyewear

   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).

6. Foster Grant - Wikipedia

   en.wikipedia.org/wiki/Foster_Grant

   Sales rapidly increased with Hollywood stars being featured in advertising campaigns, and the company became a major player in the sunglasses' industry. [ 4 ] In 1934, [ 5 ] Foster Grant purchased the first plastics injection molding machine to be imported from Europe; however, the machine arrived in non-working condition.

7. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   This specifies the part of the prescription designed primarily to improve far vision. In a bifocal lens, this generally indicates what is to be placed in the top segment. NV is an abbreviation for near vision. This may represent a single-vision lens prescription to improve near work, or the reading portion of a bifocal lens.