The most important thing is UV protection. My brother runs a golf store and
he showed me an article an eye doctor wrote about how the sun can damage
your eyesight. He was talking about golfers but it's probably worse with us because
we stare up into the sky all the time. Regular sunglasses without UV protection make
it worse because they make the iris in your eye open up letting in more of the
damaging UV rays. Pretty scary stuff !

tommy s