Sunglasses can block ultraviolet light, because the lens and add a layer of special coating, coating of inferior sunglasses easily damaged, see the outside world produces distorted object, make the eye acid bilges, gradually appear nausea, loss of appetite, forgetfulness, vision fatigue symptom such as insomnia, referred to as 'sunglasses syndrome'.
Small make up to introduce it now, when buying sunglasses how to identify strengths and weaknesses of the lens.
Sunglasses factory YC9705 general sunglasses C7 white/color of purple, 40 cm - put sunglasses at sight
45 cm, look through the lens found objects such as linear distort or swing, shows that the lenses have deformation case, quality problems, not to buy;
Check the lens found a scratch, bubble, impurities, striped, unfavorable also buy;
Can also be the lens facing up to the fluorescent lamp, and gently rotate, when there is discomfort unfavorable buy.
Second, the color of the lens is important to choose the color of the sunglasses lenses.
Studies have shown that green and grey lens uv and infrared radiation effect is better.
So, grey, green, good;
Dark brown, dark brown, black,
Blue and purple.
The colour shoulds not be too shallow, because it can't resist the glare.
A good sunglasses should be marked with 'uv -
400 ', and indicate the brand, specifications, production sites, etc.
Wearing sunglasses is only suitable for the hot sun, sunset, cloudy day, rainy day, indoor should not be wearing.
Three lenses, pay attention to the shape of the lens to level off, the higher acuity, using polarizing lenses, polarized lens can effectively filter out the reflected light and harmful ultraviolet light, and can be broken, and wear.
If you choose big lens sunglasses, is a round, good lenses from front and side protect his eyes from the rays damage.
In the strong sunlight when the choose and buy sunglasses, wear after the surrounding scenery should be very clear, at least, is to be able to see red, yellow, green and blue 4 kinds of color.
If it is to be narrowed his eyes to see objects, not to buy this glasses.
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Cn / related: sun glasses sunglasses