How to choose a pair of sunglasses and would not regret it

Buying sunglasses, first should be responsible for the eye, and then is the face. No matter how passionate you pursue for fashion, the heart of wearing sunglasses is always to protect the eyes,  so the selection of the lens is actually more important than the style of things. Experts have said that if you wear the poor sunglasses that can not block the UV, if you didn’ wear the sunglasses the UV through into the eyes is even more than wearing sunglasses, it is more likely to cause eye damage.

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Good sunglasses must reduce the conduction of light, first of all must be able to filter ultraviolet rays. Generally, if you have saw a lens with "UV 400" or "100% UV absorption" and other similar identification, you can determine it can block the wavelength of 400 nm and below. Engaged in different activities, the requirements of light transmission of wearing sunglasses are also different. The lens can not be all black In order to have a normal life. In normal circumstances, the light transmission should be at least 10% -30%, the user can make the daily activities friendly.

The color of the lens has nothing to do with the ability to filter ultraviolet light. The darker the lens are, the more able to prevent the sun glare. The deep color represents the power of transmittance is lower. In other words, even light-colored lenses can be 100% resistant to ultraviolet light.

Some studies have found that blue light from the sun into the eyes can hurt people's eyes, and blue lenses can not filter out the blue spectrum in the solar spectrum, so when choosing sunglasses, it is best not to choose the blue lens.

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