This article is from the Bicycles FAQ, by Mike Iglesias with numerous contributions by others.
From: Richard Moorman <firstname.lastname@example.org>
Date: Tue, 8 Oct 96 22:42 MDT
Helmet mirrors are very useful for nearsighted people with glasses. I use
my mirror to determine what's going to affect my travels in the next ten or
fifteen seconds. I don't worry about absolute accuracy, I just want the big
picture. If I want that information without a mirror, I have to twist my
body and head around so that I can look at the road behind me through my
glasses. To do this correctly I have to take my left hand off the bars,
disorient myself, and risk wobbling around a lot. It's dangerous. With the
mirror, it's just a glance up and to the left for a second or two. Mirrors
aren't for everyone, but for some of us they're wonderful. I use a mirror
despite the bad design that makes the plastic ones ridiculously breakable.
I hope that someone develops a flexible, springy mirror mount. It seems an
enormously obvious idea.