Generally speaking, people tend to associate sun protection with skin instead of eyes. Instead, surveys show that ultraviolet radiation is the main cause of some eye diseases, such as keratitis, cataracts, retinal damage. So, we can't ignore the eye injury caused by ultraviolet radiation.
Don't look directly into the sun. Eyes are extremely weak. Short-term direct view to sunlight will result in an immediate shadow in eyes.One may suffer from pain, tears, inflammation and blurred vision if he/she looks up to sun for a long time.
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 280nm ultraviolet radiation does maximum damage to the cornea and seems to cause conjunctivitis. The ultraviolet radiation with 290-400nm wavelength causes great damage to the lens, and it is also the cause of 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%.Well then, I'd like to tell you some preventive measures.
If you stay out in the sun, you'd better make use of hat, umbrella and bifocal glasses to protect your eyes from sunlight. It's important to note that the progressive glasses should be good in respect of quality. If you buy schlock sunglasses, instead of protecting eyes, you are doing harm to your eyes. One must buy himself/herself a pair of sunglasses with anti-UV function. Medical search results have proved that grey lenses are the best choice; lenses of too dark color may pass more UV rays to eyes. Those who wear contact lenses can also choose those with anti-VU code which can block 90% UV rays. It would be safer to add a pair of progressive eyeglasses. The sun is strongest at noon, which is harmful to both your skin and eyes. You'd better stay at home without going out.