Sunglasses are funny little devices. They shield your eyes from the sun (amongst other things) and make you feel all around invincible. So that when you are openly staring at someone, the tint of your glasses protects your eyes from detection.
Glasses on the other hand are transparent little fuckers that do nothing except make it possible for you, and for others, to see what you are seeing. I learned that the hard way, staring at a gift from God for an ungodly long time and realizing that I was wearing glasses not sunglasses. Now he must think I am a creep. Thanks glasses for screwing me over.