A few years ago my good riding pals, Robbie Moss and Stu Holt, convinced me to try riding with a mirror on my glasses. Before that I had always gone the way of the club roadie and just turned around or guessed where the traffic was. Never again.
I have to tell you, this little $15 dollar mirror has saved me on many occasions and I never ride without it. Go geek and be safer.
I can see exactly where the cars are, I can push them out or brace myself if need be as they pass. I feel like I have more control of the road, and control equals safe riding.

You would never get into your car with out the three rear view mirrors you have, plus a camera in many cars. Treat yourself to the best fifteen dollar present you can ever get.
A safer ride on the road!
This is the one I use pictured above. Deerfield Cyclery has them, along with bar mirrors, lights and all the good stuff to help keep you safe out there.
Ride safe. Mike