The protection of the skin from the sunshine attracts more attention, but the protection of the eyes from the sun is often ignored. However, the sun will cause big harm to eyes. Investigations manifest that UV rays will result in retinal damage, keratitis and cataracts. For that reason, we ought to care our eyes especially in hot summer.
Don’t look directly into the sun. The eye is a delicate tissue. A short-term exposure to sunlight will cause temporary shadow before eyes. if you stare at sun for a long time, your eyes will fell aching, they will be tearful or swollen, your vision will be blurred, which will hurt the retinalphoto finally.
As is well known, eye is a delicate tissue that is sensitive to UV rays. It can absorb UV rays with various wavelengths. The 280-nm wavelength UV ray does the greatest injury to the cornea. It is likely to cause conjunctivitis. The 290-400nm wavelength ones are prone to hurt lens and cause cataract.
Studies have shown that one more hour exposure to sunlight will increase the risk of cataract by 10%. Then how should we prevent this in daily life?
When you are outdoors, you need to wear caps or to use umbrellas, and to wear sunglass, in order to aviod direct irradiation. It is worth noting that the quality of sunglasses is of vital importance to your eyes. You’d better choose good ones. If the glasses are only coated with color in lens, then they will be unable to block the harmful UV; instead, they will make the pupil expand, which can cause greater damage as a result.
You should choose a pair of ray ban sunglasses which can protect yourself from the ultraviolet ray in spring and summer. Medical studies have shown that sunglasses with a neutral coloured lenses and gray lenses are the best choices, if the colour of the lenses is too dark, they will absorb more UV. It is better for contact lens wearers to buy anti-ultraviolet ones which cut 90% ultraviolet rays. If possible, you’d better wear ray ban shop too.
The sunlight at noon is the strongest, which can do great harm to both skin and eyes. You'd better not go out at noon.