Macular edema occurs when fluid and protein deposits collect in the
eyeball on or under a part of the retina (the lining of the back of the eye)
that is called the macula. This material causes the macula to thicken and
swell, and it may distort a person's central vision.
The macula provides sharp, clear central vision that allows a
person to see form, color, and detail that is directly in the line of
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