Different types of eye disorders

Written by Timothy Gorman

The need for prescription eyeglasses could come from many different eye conditions. The most common eye disorders are Farsightedness, Nearsightedness and Presbyopia.

Nearsightedness, otherwise known as Myopia, isrepparttar most common eye disorder. It occurs when light focuses in front ofrepparttar 146153 retina rather than focusing onrepparttar 146154 retina. The symptoms for Myopia are blurred vision on objects that are inrepparttar 146155 distance. Squintingrepparttar 146156 eye will actually makerepparttar 146157 object clearer. Vision can be corrected with prescription eyeglasses with either a bifocal or trifocal lens.

Farsightedness, or Hyperopia, is justrepparttar 146158 opposite of Myopia. The light focuses behindrepparttar 146159 retina instead of in front ofrepparttar 146160 retina. One common symptom of Hyperopia is headaches orrepparttar 146161 eyes will become tired from reading. It is difficult to see objects that are within close range. In children,repparttar 146162 most common symptom is crossed eyes. Again this eye disorder, too, can be corrected by wearing prescription eyeglasses.

What are Prescription Eyeglasses made of?

Written by Timothy Gorman

Prescription eyeglasses are manufactured in a variety of materials. The most basic isrepparttar glass lens. The glass lens is by farrepparttar 146152 best in absorbing ultraviolet light. It comes in several different colors and is, of course, scratch resistant. It is also one ofrepparttar 146153 least expensive. The downfall torepparttar 146154 glass lens isrepparttar 146155 weight of a pair of prescription eyeglasses made of glass. They are also very breakable and have to undergo a heat-treated process to ensure durability.

Another material used to manufacture prescription eyeglasses isrepparttar 146156 High-Index plastic lens. It also absorbs ultra violet light well. This type of lens is much lighter in weight thanrepparttar 146157 glass lens; however, they are also very expensive and can be scratched very easily.

Resin Plastic is another type of material used in manufacturingrepparttar 146158 prescription eyeglass lens. They arerepparttar 146159 lightest of all lenses, but do not offerrepparttar 146160 high level of protection against ultra violet light thatrepparttar 146161 other lenses offer.

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