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How do Plastic High Index Lenses Work?
High index lenses made from specialty plastics allow thinner, lighter lenses than traditional glass or plastic. These lenses are geared towards those with very strong prescriptions, both nearsighted and farsighted. Glasses correct vision by bending the light that passes through them. A stronger prescription requires more bending than a weaker one, resulting in a thicker lens. High index lenses are made of denser material than conventional lenses, bending more light through less thickness, resulting in ultra-thin, lightweight glasses. When viewing conventional glasses, one can easily see lenses designed to correct nearsightedness. The lenses are thicker at the edges than in the middle. The stronger the prescription, the thicker the edges become. |
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Cheap Eyeglasses | Iyana Eyeglasses | 2 | 578 | 10-14-2010 10:52 PM |
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