 [ Symptoms ] do darker sunglasses provide more protection for the eyes than sunglasses that are less tinted [ Disease ] the amount of uv protection provided by a pair of sunglasses is independent of the amount of tint some dark glasses can provide little uv protection and some lightly tinted glasses may provide 100 protection the key is to read the label on the sunglasses look for an indication that the sunglasses provide 100 uv protection these glasses may be labeled uv400 instead another key to the amount of uv protection will be the lens material polycarbonate lenses generally provide 100 uv protection whereas cr 39 plastic provides 88 protection and cheap triacetate lenses only confer 40 protection