Speaking of sun protection in summer, everyone would pay attention to their skin, few remember eyes. Actually, some studies suggest that UV rays are really harmful to eyes and may cause keratitis, cataracts, retinal damage and so on. So, we can't ignore the eye injury caused by ultraviolet radiation.
Never look sun straightly in the sunny days. The eye is a delicate tissue. Short-time direct view to sun may result in transient giddiness. Long-term direct view to sunlight will cause pain, tears, inflammation and blurred vision and even hurt retina.
As is well known, eye is a delicate tissue that is sensitive to UV rays. It can absorb UV rays with various wavelengths. 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.Studies suggest one is more likely to get cataract if he/she roasts in the sun more. And now we should talk about some precautions.
When you go out in hot summer days, you must bring hat, parasol and bifocal glasses with you for sun protection use. It is worth notice that only quality progressive glasses are good to your eyes and effective in protection. Inferior sunglasses will hurt your eyes rather than protecting eyes. They may cause mydriasis. Prepare a pair of UV-cut sunglasses for summer use, and you will benefit a lot. Medical search results have proved that grey lenses are the best choice; lenses of too dark color may pass more UV rays to eyes. People wearing contact lenses can buy UV-protective ones which are able to block 90% ultraviolet radiation. If possible, you'd better wear progressive eyewear too.Don't work or do activities outside at noon because the sum at that time is strongest and prone to hurt skin as well as eyes.