When Choosing Sunglasses, You Must Be Able To Protect Your Eyes
Ultraviolet can be divided into UV-A (320 to 400nm), UV-B (280 to 320nm) and UV-C (100 to 280nm) according to the wavelength. Generally speaking, the shorter the wavelength, the higher the energy and the greater the harmfulness. The strongest UV-C will be isolated in the atmosphere; The main UV rays that cause eye problems are UV-A and UV-B, UV-A is the main cause of cataract and macular lesions, and also can cause skin aging and darkening; UV-B has shorter wavelength and stronger relative energy than UV-A, which is easy to cause pannus and photokeratitis.
Choose sunglasses and UV400 lenses
If you can go to an optical glasses shop or buy sunglasses of a larger brand, it will be more secure. The most important thing is to choose UV400 anti ultraviolet lenses to isolate light with a wavelength below 400 nanometers. Another main function of sunglasses is to reduce the intensity of visible light, so that people will not feel too bright, and the contrast of things will be better, so as to prevent the retina from being stimulated for too long, causing eye fatigue and injury.
Select the grade of sunglasses filter according to the site
In general indoor environment, driving, or walking in the city, it is enough to choose sunglasses that can filter 50% - 60% of the visible light. Large brands will indicate the degree of optical sunglasses filter, about the second to third level. If there is no data mark, the simplest judgment method is to wear sunglasses and look at the mirror to see the eye contour. If you want to go to the seaside, mountain climbing, or skiing, because the ultraviolet light is strong in these places, it is recommended to choose sunglasses that can filter 80% - 90% of the visible light, that is, the range of the third to fourth level of filter degree. After wearing sunglasses of this level, you cannot see the detailed contour of the eyes clearly.
Anti UV damage to eyes, there are several steps to choose sunglasses!
Poor lenses hurt your eyes
Unqualified tinted lenses with poor quality can only filter out visible light and cannot block the damage of ultraviolet light. Wearing such inferior sunglasses will hurt the eyes more than not, because under normal light, the pupil will have a protection mechanism, and the pupil will shrink, reducing the proportion of visible light and ultraviolet light entering the eyes; Poor quality lenses only filter out the visible light, and the pupil will think that the light is not so strong now. At this time, the pupil will enlarge, but let the ultraviolet ray drive straight into the retina and lens, and hurt the eyes.
Thank you for your reading
Lissia
009@mikeeyewear.com
Wenzhou Mike Optical Company
