Eyeglasses with Concave Lenses

  All the eyeglasses up till the 16th century were made using convex lenses which were unable to cure near sightedness. This painting by Raphael shows Pope Leo X, one of the first few people to start using concave glasses. Pope Leo X was very near-sighted and used these glasses for hunting. "With them I see better than my companions," are his words. This picture hangs in the Pitti Palace in Florence, where the concave lenses can be seen in his hands. The image is from Wikimedia Commons and is available for public use.  

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