One of the most serious causes of eye disease is: UV. Depending on the frequency and wavelength, UV is divided into two categories: UVA and UVB.
As a natural eye protection mechanism, people's eyes cornea can absorb all the ultraviolet B and most of the ultraviolet A. However, there is still a part of the UVA will reach the lens of the eye. Prolonged absorption of UVA may lead to cataracts, a small amount of through the cornea to reach the retina of the ultraviolet A can lead to retinal macular degeneration, and macular degeneration is caused by the elderly over the age of 65 the main reason for blindness. Long exposure to intense ultraviolet light can cause eye cancer or actinic keratitis, which is the burn of the retina. This situation often occurs in the winter sunny sunny outdoor, snow reflects the sun glare, which is often called snow blind.
Sunglasses have a good UV-resistant coating that eliminates UV radiation and you must ensure that your sunglasses are able to filter out two UVs. The sunglasses should indicate the extent to which the sunglasses can provide UV protection, and what you need is 100% protected.