Sunglasses Lens-AC Lens

One of the causes of some of the most serious eye diseases: UV rays. UV rays are divided into two categories according to frequency and wavelength: UV A and UV B. As a natural eye protection mechanism, the cornea of ​​people's eyes absorbs all UV-B and most UV-A. However, some UVA rays still reach the lens of the eye. Prolonged absorption of UV-A can lead to cataracts, and small amounts of UV-A that pass through the cornea to the retina can cause retinal macular degeneration, the leading cause of blindness in people over 65. Long-term exposure to intense UV rays can cause eye cancer or actinic keratitis, which is burning of the retina. This condition often occurs outdoors on a sunny day after snow in winter, where the snow reflects the sun's glare and is often referred to as snow blindness. Sunglasses have a good UV-blocking coating that eliminates UV radiation, and you have to make sure your sunglasses filter out 100 percent of both types of UV rays. The label on the sunglasses should indicate how much UV protection the sunglasses provide, and what you need is 100% protection.