Choose Sunglasses that Can Protect Your Eyes
UV-A and UV-B are liable to cause eye diseases
UV can be divided into UV-A (320 to 400nm), UV-B (280 to 320nm) and UV-C (100 to 280nm) according to wavelength. In general, the shorter the wavelength, the higher the energy, and the greater the harm. The most energetic UV-C will be isolated in the atmosphere; UV-A and UV-B are the main causes of eye problems. UV-A is the main cause of cataract and macular lesions, and also causes skin aging and darkening; The wavelength of UV-B is shorter and the relative energy is stronger than that of UV-A, which is easy to cause pannus and photokeratitis.
To prevent ultraviolet rays from hurting your eyes, there are several steps to choose sunglasses!
Choose sunglasses and UV400 lenses
If you can go to the optical glasses shop or buy sunglasses of a larger brand, you will be guaranteed. The most important thing is to choose UV400 anti-ultraviolet lenses to insulate the light with wavelength below 400 nm. Another main function of sunglasses is to reduce the intensity of visible light, so that people will not feel that the light is too bright, and the contrast of things will also 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 presence
In general indoor environment, driving, or walking in the city, it is sufficient to select sunglasses that can filter 50% - 60% of the visible light. Large manufacturers will indicate the degree of optical sunglasses filter, which can be selected from the second level to the 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 outline. If you want to go to the seaside, mountaineering, or skiing, because these places have strong ultraviolet rays, 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 can not see the detailed outline of the eyes.
To prevent ultraviolet rays from hurting your eyes, there are several steps to choose sunglasses!
Poor lenses hurt eyes
The substandard tinted lenses with poor quality can only filter the visible light and cannot block the damage of ultraviolet rays. Wearing such substandard sunglasses is more harmful to the eyes than not wearing them, because under normal light, the pupil will have a protective mechanism, the pupil will shrink, and the proportion of visible light and ultraviolet rays entering the eyes will be reduced; The inferior 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 rays go straight into the retina and lens, and hurt the eyes.
Thank you for your reading
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