although if you have drop style handlebars an or aero bars, a bar end mirror will not work. I have astigmatism so I bike in a pair of semi srap dark glasses which allow me to see from 10- 100 feet clearly but fuzzy otherwise and use a glasses mirror. I tried a helmet mirror but could never find a good adjustment, but the eyeglasses mirro I hardly ever notice and glancing up at it has become so instinctula I often find myself trying to do the same thing in the cr insted or remembering Ihave to use my side mirror for traffic coming up behind. Just don't forget that you also have to turn your head and check visually as well.

marni