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Question	Answer
Though there is earlier evidence of spectacles, the invention is credited to this inventor in 13th century Florence Image: Salvino (binary/octet-stream)	Salvino d'Armati
It was not until the 16th century that lenses of this type were developed	minus (or concave) lenses for treating Myopia (nearsightedness)
this type of spectacle lenses were not developed until the 19th century	toric lenses for treating astigmatism
bifocals were invented in the 18th century by this famous American polymath	Benjamin Franklin

History of Spectacles

	Created by Terry Mumma almost 7 years ago