Multiple evanescent white dot syndrome--an uncommon cause for an enlarged blind spot.

This report describes 3 cases of multiple evanescent white dot syndrome (MEWDS) which presented to the Singapore National Eye Centre over a 3-year period. MEWDS is an usual condition with distinct clinical features and typical findings on fundal fluorescein angiography. As the retinal lesions are transient, timing of examination is crucial for an accurate diagnosis. Usually only one eye is involved and recurrences are uncommon. Occasionally, signs of optic nerve disease may be the predominant feature. Although the aetiology remains unknown and no active treatment is required, the visual prognosis remains good.