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.