What About Eyeglasses?
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Eyeglasses are devices for aiding, improving or correcting defective sight. In addition correcting various eye conditions, eyeglasses are also utilized for protecting eyes from damage caused by sunlight, ultraviolet light or flying objects. Eyeglasses typically consist of a pair of glass or plastic lenses mounted in a frame that sits on the bridge of the nose and is held in place with arms that rest or are hooked behind the ears.
Eyeglasses are made from high-tech materials:
Eyeglass lenses, originally made exclusively from glass, have evolved to include high-tech polymer materials such as CR39, Transitions® (photochromic plastic), Polycarbonate, and High Index plastic. Lastly, multifocal lenses have been developed which contain two or more vision-correcting prescriptions in one lens (ex. Bifocals = lenses split into two sections; the upper part is for distance vision and the lower part is for near vision, and Progressives = lenses that gradually change prescription from normal distance vision at the top to intermediate vision (arms length vision) in the middle to a reading prescription at the bottom. Further, eyeglasses have options for individual needs consisting of lens filters that block the ultraviolet (UV) light, anti-scratch coatings that increase the surface hardness of lenses (an important feature when using plastic lenses) and anti-reflective (AR) coatings that eliminate significant glare and allow other people to see the eyes of the wearer. There is also a full spectum of eyeglass lens tints, from lighter tints to darker tints, for use in sunglasses.
So, "What About Eyeglasses"?
The answer is easy at EyeglassDirect.com