Prescription Sunglasses for Myopia People

When summer comes,  it is the best way to put on a pair of prescription sunglasses to protect the eyes from sunshine.

Sunglasses could not only protect the eyes from the strong sun lights which are harmful to the eyes and eye skins, but also serve as a kind of decoration. It doubles the advantages. However, sunglasses without particular strength are invalid for those who suffer from myopia, hyperopia or astigmatism. Therefore, special sunglasses have designed to solve the problem-prescription sunglasses with the function of prescription glasses as well as sunglasses.

Some Facts of Ultraviolet Radiation (UV rays) You Should Know

Ultraviolet (UV) radiation consists of invisible rays from the sun. The three bands of UV light are: UVA, UVB and UVC. UVC rays are of little concern as they are absorbed by the upper atmosphere and do not reach the earth’s surface. UVB rays are the ones that burn the skin and can damage the eyes. UVA rays are primarily absorbed within the lens of the human eye, though there are no documented disorders of the human eye from UVA.

The surface on which the sunlight shines will cause great influence on UV light levels: UV light levels may increase ten times higher after the reflection. The following shows how much higher UV light levels would increase in different places:

* beach 15%  ●water surface 20%  ●snowfield 85%

If you are fond of outdoor sports, you’d better take care of how high the UV light levels are in these places.

What kind of harmful effects UV rays would cause on eyes?

* pingueculae
* cataracts
* pterygium
* age-related macular degeneration: a disease of the eye, people would in a loss of vision in the center of the visial field (the macula) because of damage to the retina.

In the recent 50 years, the number of people who have cataracts and the degeneration which related to increased ages has grown at a remarkable rate.

Who will take bigger risk?

* people who are fond of outdoor sports
* people who live in high altitudes or the place closed to the equator
* people who wear contact lens
* children
* people who with light colored eyes

High intensities of UVB light are hazardous to the eyes, and exposure can cause blinding eye diseases. Sunglass standards for lenses place limits solely on UVB and UVA rays, but bear in mind that both the standards and labeling are voluntary, not mandatory. According to these standards, sunglasses must block at least 70 percent of UVB and at least 60 percent of UVA (Block UV light above 380 nm).

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