These days, plastic lenses incorporate UV protection. I have a yellow tint on my glasses to make it easier to see cloud wisps and haze domes - and keep my pupil diameter down for better acuity.
My opthalmologist has been muttering about cataracts for over a decade, but they're not bad enough for the op yet.
Contrast is a biggie. Rigging my glider on a nice sunny day, underneath the turtledeck is a black hole.