It happens when the small central portion of your retina, called the macula, wears down. The retina is the light-sensing nerve tissue at the back of your eye.
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Often confused with each other, these two central nervous system disorders have some of the same symptoms. They affect your spinal cord and optic nerves but are treated differently.
Take a peek at the evolution of spectacles, from early evidence of concave lenses to modern glasses designed for digital eye strain.