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M. C., aged 42, a widow, the mother of three children, a sewing machine operator, applied for treatment at the clinic of the Harlem Eye and Ear Hospital in August, 1933, complaining that for seven months "a black ball" passed before her right eye and more and more interfered with her work. She said that it did not affect her vision for distance. There were no other symptoms. Her history in general and in relation to any specific disease was negative. Vision was 20/20 in both eyes. The conjunctiva, cornea and iris were normal. With mydriasis the lens was clear and both fundi were normal ; on sudden movement of the right eyeball a round lens-shaped body immediately posterior to the lens floated across the englarged pupil and sank slowly out of sight. Except for smudges of dark brown around its edges the body was translucent and behaved very much