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Eyeglasses are devices for aiding, improving or correcting defective sight. In addition to 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 hook or rest behind the ears.
Eyeglass lenses, originally made exclusively from glass, have evolved to include high-tech polymer materials such as CR39, Transitions� (photochromic plastic), Polycarbonate, and High Index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. 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 (arm�s length vision) in the middle to a reading prescription at the bottom. Eyeglasses have additional options for individuals, including 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 spectrum of eyeglass lens tints, from lighter tints to darker tints, for use in sunglasses.
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Unsure where to buy eyeglasses online? You're in the right place at EyeglassDirect.com. We provide top-quality eyeglass frames for your prescription lenses. Choose from a variety of frames, including Metal, Titanium, Vintage Style, and even Magnetic Reading Glasses. Our experts at Eyeglass Direct specialize in Single Vision, Progressive No-Line and Bifocal prescriptions. Simply select a frame, enter your preference for wear, insert your prescription, add any additional features, and let us take care of the rest. Buying eyeglasses online is easy with EyeglassDirect.com. Get started today!