The basic function of sunglasses

A pair of cheap sunglasses looks very simple two color glass or plastic sheet, which is a plastic or metal frame. What could be more
Sunglasses, plus simple? In fact, the two glass lenses can produce a lot of difference when you use sunglasses, these differences will have a great impact on your In this article you will understand the difference does exist between a variety of replica sunglasses. A good pair of sunglasses must have the following four functions:

(1) to prevent the ultraviolet radiation in sunlight
The ultraviolet rays can damage the cornea and the retina, high-quality sunglasses can completely eliminate the ultraviolet radiation.

2 to prevent light exposure
When the eye receives too much light, it will naturally contraction of the iris. Once the iris contraction to limit state, then people need to squint. If the light is still too much, such as snow reflected sunlight will be on the retinal damage. Quality sunglasses can filter out into eyes light up to 97% in order to avoid injury.

Prevent glare exposure
Certain surfaces, such as the water, can reflect a lot of light, produced highlights disrupt the line of sight or hidden objects. High-quality sunglasses with polarized technology to completely eliminate such a glare polarizer technology, we will introduce later.

4 to eliminate specific frequencies of light
Certain frequencies of light can blur the line of sight, and some other frequency light can enhance the contrast. Sunglasses to choose the correct color, make it be more effective in certain circumstances.

If the sunglasses do not provide UV protection, it takes you more exposure to ultraviolet radiation. Cheap sunglasses filter out part of the light, cause your iris to open to receive more light. This also would allow more ultraviolet radiation into the increases the damage of ultraviolet rays on the retina.
Therefore, all kinds of sunglasses does have a difference. For a particular use of the environment, the selection of suitable, high-quality sunglasses(for instance cheap ray ban sunglasses) will provide you with maximum protection.

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