Catchin' some rays ain't always what it is cracked up to be, especially if they are UV rays. These rays don't sing but they can play a tune on your eyes if you are not careful. There are three basic types of UV radiation: UV A Rays- May produce severe reactions to all layers of the cornea. UV B rays May cause permanent cataracts. All UV C Rays- May produce photokeratitis.(welder's flash). Almost all industrial safety glasses are 99.9% UV A and B protected. Only specialized industrial safety glasses meet UV C standards. That's why it is wise to wear safety glasses when both at work or play.