Fig. 59. A. Typical cystoid degeneration of the peripheral retina with cyst-like spaces in the outer plexiform layer (Blessig-Iwanoff cysts). These cysts sometimes coalesce, and the inner layer breaks down to form a hole. B. Peripheral cystoid degeneration with atrophic holes. (A, courtesy of Ralph C. Eagle Jr, MD, Philadelphia, PA. B, courtesy of William Tasman, MD, Philadelphia, PA).