Essential tremor is a condition that causes involuntary shaking. While it usually develops in middle age, it can start much earlier. Shari Finsilver was aware of her hands shaking as a child. When I was about 11 years old, I noticed in art class that I was never able to draw a straight line, she says. I really didn't know why.
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A simple historical timeline of eyeglasses starts with their invention, believed to be between 1268 and 1289 in Italy. The inventor is unknown. The earliest eyeglasses were worn by monks and scholars. They were held in front of the eyes or balanced on the nose.