subject: Summer is coming, don't use bad quality sunglasses to ruin your eyes [print this page] Summer is coming, don't use bad quality sunglasses to ruin your eyes
Summer is coming, most people now are preparing sunglasses for the coming summer. And most eye doctors suggest us notwearing bad quality sunglasses. But when youface so many sunglasses in the market, how can you pick up the right one?
When we choose sunglasses, we should not go for petty advantages. A pair of qualified prescription sunglasses should have the function of reducing strong sunlight, providing clear eyesight, protecting eyes from ultraviolet radiation and offering undistorted traffic signal. If you wear a pair of bad quality sunglasses, it doesn,t have the function of protectingyour eyes, if you're lucky. If not, you may feel dizzy and painfull on your eyes. Or even make you lag in response, and can't identify things around you thereby causing some traffic accidents.
Therefore, choosing a pair of qualified sunglasses is very important. Most eye doctors suggest that you should better buy prescription sunglasses even if you have good eyesight. Take your eye prescription to buy sunglasses is to make sure the sunglasses you buy is exactly working well with your eyes.
Apart from the quality of sunglasses and the strength of our eyes, there +are still many other reasons +that can cause us blur vision and eyestrains when wearing it. For example, the unqualified techniques, the substandard index of refraction and penetration ration can lead you feel uncomfortable with the sunglasses.
From a point of view of medical, although sunglasses have the function of blocking strong ultraviolet radiation, it also reduces the transmission, so some visible lights are also blocked. Therefore, the poor quality sunglasses are weak to block ultraviolet radiation, but they have great ability to block visible light. By wearing this kind of sunglasses, the objects in the outside world are usually dark and gray, the blur objects are likely to cause " deprivation myopia."
Besides, since those poor quality sunglasses can't block ultraviolet rays, it may cause burn to your eyes. You may not find the hurt in early time, but it will damage your retina after it is accumulated to a certain extent.
Therefore, when you choose prescription sunglasses, only taking your eye prescription is not enough. You should check their UV index. Generally speaking, 100%UV protection is impossible. Most sunglasses should have 96%-98%UV protection. Besides, the lenses color also can affect the result of prevent sunlight. So when we choose sunglasses, we should also think about our usage. For example, dark or grey colored sunglasses are suitable for wearing when people are driving.
