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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Metal is the most durable eyeglass frame materialalthough metal frames tend to be thinner in the eye wire, the part of the frame that holds the lens in place.Three of the most frequently used metals include aluminum, flexon and titanium, with steel being equal to titanium but offering fewer color options.