Some of the most serious causes of eye disease is one of: ultraviolet. According to a different frequency and wavelength, UV is divided into two categories: UV-A and UV-B.
  Eye as a natural protective mechanism, it is the eye the cornea absorbs all the UV-B and most of the ultraviolet A. However, there are some UV-A will reach the lens of the eye. For a long time to absorb UV-A may cause cataracts, a small amount reaches the retina through the cornea of ??UV-A can lead to macular degeneration, and macular degeneration are over the age of 65 resulted in blindness. Long-term exposure to strong UV light can cause eye cancer or actinic keratitis, which is the retina burns. This often happens after a sunny day in the winter snow outdoors, snow reflect the sun glare, which is often called snow blindness.
  Sunglasses have a good UV coatings, UV radiation can be eliminated, you must ensure one hundred percent of your sunglasses to filter the two kinds of ultraviolet light. The label on the sunglasses should indicate the extent to which sunglasses provide UV protection, and you need 100% protection.