Macular edema occurs when fluid and protein deposits collect on or under the macula, 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. It provides sharp, clear central vision that allows a person to see form, color, and detail that is directly in the line of sight.
Macularedema or swelling of the retina is one of the retinal changes associated with diabetic retinopathy and worsening of visual acuity.
The presence of edema was quantified as not present (0), slight edema or possible edema (1), and apparent macularedema (3).
Macularedema was defined as greater than 250 microns in the central macula or greater than 300 microns in any of the eight adjacent sectors on the macula map.
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