Speaking of sun protection in summer, everyone would pay attention to their skin, few remember eyes. In fact, studies have shown that ultraviolet radiation will lead to keratitis, cataracts, retinal damage and other eye diseases. Thus, delicate eyes need our special care in heat summer days.
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.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 ultraviolet radiation with 280nm wavelength does the most damage to the cornea, and it is the cause of conjunctivitis. The 290-400nm wavelength UV ray can cause biggest damage to the lens, which is also the reason for cataract. Research suggests that one more hour you bask in the sun every day; you are likely to get cataract with 10% more chance. And now we should talk about some precautions.
If you stay out in the sun, you'd better make use of hat, umbrella and bifocal eyeglasses to protect your eyes from sunlight. It's important to note that the bifocal sunglasses should be good in respect of quality. 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. Medical studies have certified that lenses in grey are best as grey have little influence on the effect of vision but effective in anti-UV. Those who wear contact lenses can also choose those with anti-VU code which can block 90% UV rays. It will be better to wear a pair of progressive eyeglasses.You'd better not go outside at noon when the sun is strong and are likely to threat the security of skin and eyes.