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Hypertensive Retinopathy (Cotton Wool Spots)

Hypertensive Retinopathy (Cotton Wool Spots)
Hypertensive Retinopathy (Cotton Wool Spots)

Cotton-wool spots (bottom) are white and have indistinct borders. They are an additional feature of moderate hypertensive retinopathy and are caused by focal axonal swelling of the retinal nerve fiber layer as a result of small-vessel occlusion.

PAUL PARKER/SCIENCE PHOTO LIBRARY