The "Cold" Knowledge You Should Know About Sunglasses
It's hot summer again. When the sun shines, a pair of fashionable sunglasses can not only block the strong sunlight, but also be a sharp tool with concave shape. Many fashion people believe that summer without sunglasses is incomplete.
First of all, let's talk about the real purpose of wearing sunglasses - of course, not for concave shape, but to prevent eye diseases!
1. The main function of sunglasses is to filter ultraviolet rays. Too much ultraviolet (UV) exposure in the sun may cause cataracts, eyelid skin cancer and electro-optic ophthalmia. Even wearing a wide brimmed hat can only block about 50% of ultraviolet rays from reaching the eyes. Therefore, it is very necessary to wear sunglasses when the sun is strong.
2. Sunglasses can filter short wavelength blue light. The study found that long-term exposure to ultraviolet and short wavelength blue light is a risk factor for age-related age-related macular variability.
3. In summer, wearing sunglasses can reduce the adjustment burden of the ciliary muscles of the eyes in strong light, so that the eyes can see objects comfortably in natural light.
Of course, sunglasses can play such an important role in protecting our eyes, there is a crucial premise, that is, qualified quality.
At present, the main problem of inferior sunglasses on the market is that the transmittance of UV spectrum is unqualified, that is to say, too much UV light passes through and cannot block UV light. In addition, there are too large axial deviation and too large horizontal deviation of optical center. These two test indicators are unqualified, which are the main reasons for blurred vision and eye fatigue.
Thank you for your reading
Mike Optical Company
009@mikeeyewear.com
Lissia
