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macular edema

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, colour, and detail that is directly in the line of sight.

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