These are reproduction late 18th century spectacles with round lenses. They are double hinged and are copies from an original pair in the Godwins collection. The frame dimensions are: 5 across from temple to temple; lenses are 1 3/16 in diameter. All spectacles come with both 200 power clear reading lenses and 400 UV brown sun glass lenses. These high quality frames can also be set with your prescription lenses by your optometrist.
Sunglasses made from flat panes of smoky quartz, which offered no corrective powers but did protect the eyes from glare were used in China in the 12th century or possibly earlier. Also, Ancient documents describe the use of such crystal sunglasses by judges in ancient Chinese courts to conceal their facial expressions while questioning witnesses.