Sunglasses and fashion are inseparable. Once you put on sunglasses, you would feel a kind of difference in seconds.
1. UV protection
Dark-colored sunglasses do not mean that they are UV protective, while light or colorless does not mean that they cannot anti UV rays.
If you are also wearing optical glasses, it usually has a UV protection function. It should be said that most of the optical lenses currently on the market have UV protection, and the sun protection index is not low.
The UV protective ability of the lens mainly depends on the UV value.
If the lens marks anti UV400, it means that it can block 99% of ultraviolet rays below 400nm, including UVA, UVB, and UVC.
2. Polarized lens
Some sunglasses use polarized lenses. What does this mean? Look at the picture below.
The bright and dazzling reflected light on the water surface in the picture is polarized light. If you are outdoors on a sunny day, there will be such diffusely reflected polarized light everywhere, which will stimulate our eyes and make us unable to see the real scenery.
What happens if we wear polarized lens sunglasses?
When wearing polarized lenses, you can find that your eyesight has improved and you can see more clearly.
Whether it is day or night, polarized lenses can filter out some strong reflected light, allowing you to see more clearly.
The color of sunglasses has nothing to do with UV protective ability, but it relates to how much light is weakened, and the visual effects.
1) The gray lens can effectively reduce the intensity of the light without changing the color of the object. Visible light in bright sunlight is also harmful to the eyes, so weakening the light is a way to protect our eyes.
2) The brown lens can block some blue light, but the color of the object may seem to change a little. It is suitable for the occasions like snow, water, beaches, etc.
3) Yellow/amber blocks most of the blue light, but the color of the object may change significantly. This color lens is suitable for viewing mobile phones, computers, etc. (effectively filter blue light)
4. The bigger, the better
If you want to achieve the best UV protection effect, in addition to the sun protection index of the lens, there is a secret： The bigger the better.
OK, do you get your own ideas of choosing sunglasses now?
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