Ultraviolet radiation (UV) refers to the low frequency light waves produced by the sun. There are three forms of UV rays: UVA, UVB, and UVC.
UVC – The atmosphere filters UV-C, so it is not a real concern.
UVA – The cause of sun related drug reactions.
UVB – This type of UV is responsible for sunburn, prolonged eye damage, and most forms of sun related skin cancers. It can penetrate thin cloud layers and up to three feet of water. This is the one that will do the greatest damage to eyes.
To provide adequate protection, look for sun glasses that absorb at least 99% of UV radiation. Choose sunglasses with one of the following indexes:
‘Blocks 99% or 100% of UV rays’
‘UV absorption up to 400nm’
‘Meets ANSI UV requirements.’