Lenses Optics Classification

Lenses optics has many ways of classification

Lenses optics has many ways of classification. By material, there are plastic lenses optics, glass lenses, and polycarbonate lenses, hi-index lenses etc By curvature, there are concave lenses optics and convex lenses as well as many variations. By focal point, there are single lenses optics, multifocal lenses and progressive lenses. In addition to these, prescription is still another way to categorize lenses. The simple two types are prescription lenses optics and non-prescription lenses. Prescription lenses are mainly for eye problems or diseases such as presbyopia, myopia and so on, while non-prescription lenses suit conditions related to eye protection and dressing. UV lenses are just one type of non-prescription lenses optics.

UV lenses are designed to provide wears eyes with protection from UV rays and require no prescription. They are necessary when you are under the sun light. In addition to basic knowledge about UV lenses, there are also some notices.

Always have your sunglasses evaluated if you are not sure about the protection level of your UV lenses optics. Some optical instruments such as spectrophotometers can measure the amount of visible light and UV rays that your lenses can block.

Even if you are in the shade, you may still receive UV rays after reflection, so that you also need UV lenses to block these rays from buildings, roadways and other surface.

A large number of people may not realize that they also need UV lenses optics in winter. The fact is that fresh snow reflects 80 percent of UV rays. If you like skiing, you really should wear a pair of UV lenses.

UV contact lenses can not offer complete UV protection even if they are made of this function. The un-covered tissues can still be damaged by UV rays. Sunglasses with UV lenses are also needed.

by: MichellePerkins

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