There is a popular idea that magnifying glasses are a relatively modern invention, and that consequently all antique die-sinking and gem-cutting must have been done by people with very short sight, which is equivalent to having a magnifier permanently attached to one's eyes. This idea is so prevalent that when ancient magnifying glasses are found, scholars go to the trouble of trying to find some other use to which they could be put, the favourite suggestion being that they must have been ornaments.