People think of sun protection as skin protection, seldom have eye protection in mind. In fact, studies have shown that ultraviolet radiation will lead to keratitis, cataracts, retinal damage and other eye diseases. For that reason, we ought to care our eyes especially in hot summer.
Please don't look up into the sun. Eyes are more vulnerable. Direct view to sun for a while may lead to temporary giddiness.If one looks at sun directly for a long time, he/she is likely to get eye pain, tears, inflammation and blurred vision.
It is believed eyes are the most sensitive part to the UV rays; they can absorb a broad range of wavelengths of ultraviolet rays.The UV ray of 280nm wavelength damages the cornea most badly and it brings about the conjunctivitis. The 290-400nm ultraviolet radiation does damage to the lens and would result in cataract. Surveys show that if you bask yourself in the sun for one more hour every day, the rate that you get cataract increase 10%.And now we should talk about some precautions.
When you go out in hot summer days, you must bring hat, parasol and bifocal eyeglasses with you for sun protection use. What is noteworthy is that the quality of progressive glasses is very important to the health of eyes. If you buy schlock sunglasses, instead of protecting eyes, you are doing harm to your eyes. Buy a pair of anti-ultraviolet sunglasses when summer comes so that your eyes will be safer. It has been shown in much medical research that sunglasses of neutral density glass with grey lenses are best in blocking UV rays. It is better for contact lens wearers to buy anti-ultraviolet ones which cut 90% ultraviolet rays. If you wear progressive eyeglasses at the same time, so much the better. The sun is strongest at noon, which is harmful to both your skin and eyes. You'd better stay at home without going out.