ABO NOCE Basic Opticianry

Answer: A - A flash mirror allows people looking at you to be able to see your eyes.

A pure mirror is more intense and people will not be able to see your eyes. A flash mirror is applied over a tinted lens, so you can be looking through one color and have a different color flash mirrored on the outside of the lens.

For instance if you have a blue sunglass frame, you might want a flash mirror of blue to match, however you don’t want to look through a blue lens, so you pick a brown tinted lens with a blue flash mirror on top.