Like Adamal47 I too wear the clear glasses that I got at WalMart. They are prescription. I keep them all the time in my windshield pouch. Then, when I get out of work from my 4-12 shift, and it's dark, I just grab those instead of the prescription sun glasses that I rode into work with at 3:45 p.m. when the sun was out. Works just fine for me.