Fig. 39. A. Anterior segment of the eye of a patient born with disc-shaped cataract. The equatorial area histologically appeared “almost normal,” forming a doughnut around a thin central membranous area about 2.5 to 3 mm in diameter. The area indicated by the arrow is shown at a higher magnification in B. (Haro ES: Hereditary disc-shaped (ring) cataract. Arch Ophthalmol 36:82, 1946)