Sun tanning is very popular, it can strength our immune system and promote the absorption of Ca and P. The UV in the sunshine even has a strong bactericidal capacity. But as we know, if the cornea were exploded under UV for even a short time, it could cause acute inflammation of the eyes, such as conjunctivitis and keratitis. It can accelerate the conformation of cataract, and even affect fundus, cause macular degeneration, and worsen the eyesight eventually. So it's very important and necessary to protect our eyes while sun tanning. Wearing sunglasses can not only protect the eyes, but also the skin around, which is thinner and more sensitive than most part of the body surface. It would be best to choose those ones that can block 99% or 100% of the UV. Generally, the good ones always indicate the data of capacity blocking the UV. So don't easily buy sunglasses with no data but only the words'' block the UV effectively''. Besides sunglasses, hat with wide visor is also a good choice.
