Recently, needing something to assist my lagging vision and protect my eyes against the often-fierce southern California sun while at the range, I ordered a pair of Wiley X prescription high-impact sunglasses (dealer only).
I've never made a better decision.
Since I got them, I've shot through consecutive days of glaring conditions with never a headache or strained eye. Used extensively by U.S. troops overseas, Wiley X glasses and goggles are designed for hard use in tough conditions—and they look great, too.
There are something like 50 different frames available in many varieties of prescription lenses—gray, yellow, green, rust, mirror, polarized, you name it.
I got the gray polarized version and am seeing more clearly and with less distortion and reflection around my sights than I can ever remember. Most frame/prescription lens combinations run between $150 and $300. I think you'll be as impressed as I was.