I second the recommendation of the Take a Look mirror. I have been using it attached to my glasses, and when properly adjusted it is not in the line of vision I use to watch forward. I do have to move my head just a bit to get a good look behind me, but it is easy to glance up and check traffic when I need to. The attachment to the glasses is secure enough to do the job, but I think it would easily be knocked off in a fall. The way I mount it I think it would move up and away from my face first, but of course in a fall things can be a bit unpredictable. I feel much safer when I wear it, and find that I plan routes that are not limited to right turns!