Sun Glasses are actually a visual aid that features colored and darkened lenses. They were once known as Sun Cheaters.
The history of the glasses dates back to the time of Roman Emperor Gino. When he watched gladiator fights with emeralds. Then they were used in China during the 12 century and were in the form of flat panes of smoky quartz.
The modern day sunglasses were invented by James Ayscough. He experimented with tinted glasses. Sunglasses became popular in the early 1900's. Inexpensive glasses were introduced to the American market in the year 1929 by Sam Foster.