Will Darker-tinted Sunglass Lenses Give the Best protection from the Sun?

It's not the lens color that guards eyes; it's UV protection.
"Glasses should be marked as having no less than 99% coverage,"
says Eliot Grossman, OD, chief of eye health and optometry
at Lenscrafters. "That guarantees a barrier against sun-induced
macular degeneration, cataracts, and skin cancer in and around
the eye." Check your favorite glasses with an eyewear store's
UV meter.

-Prevention Magazine, August 2012