Macular
edema occurs when fluid and
protein deposits collect on or under the
macula of the
eye, a yellow central area of the
retina, causing it to thicken and swell. The swelling may distort a person's central
vision, as the macula is near the center of the
retina at the back of the eyeball. This area holds tightly packed
cones that provide sharp, clear central vision to enable a person to see form, color, and detail that is directly in the line of sight.
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