What level of UV protection is recommended for glacier travel? For example, I have sunglasses which says 40% UV layer. Will this be ok for glacier trekking, or do I need glasses with higher level of protection?
Related At what point do I need snow goggles or glacier glasses when hiking? & How much side protection should sunglasses have?– user2766Jul 6, 2015 at 8:24
Snow blindness is at best very painful. UV damage to your eyes is not something you want to play around with. If only 40% protection they are are not sunglasses, they are fashion accessories and offer no where near enough to protect your eyes for more than an hour.
For $10 you will get glasses that provide 99% protection, why risk it?