I do have prescription sunglasses, but I find it a nuisance to have to take off my eyeglasses, put them away, put on the prescription sunglasses, take them off when the time comes, put them away, put on the eyeglasses, and-so-on-and-so-forth.  I've purchased clip ons before, and they've either been too heavy or poor quality.  These Polarized clip ons are fantastic!  They're light and they work brilliantly.  The first time I wore them I remarked to my husband that I could see all KINDS of flaws in the window of his [brand new Nissan 370Z] - much to his horror! - until he realized I was wearing polarized shades, and they {apparently} reveal how well made the windows truly are!  The quality of protection provided from the sun's glare is far better than other clip ons as well.  I would most definitely recommend these shades.  They look pretty cool, too.