CYLINDRICAL, glassy appearing structures attached to the posterior surface of the cornea and extending partially or entirely back to the pupil have been described in eyes having a history of a corneal perforating wound. They have been called by other authors, glassy cones1or Descemet's membrane tubes.2The histopathology of these structures has not yet been described. Report of a Case An 19-year-old white man was referred to the Bascom Palmer Eye Institute with a chief complaint of a blind painful right eye of seven months' duration. The patient had no ocular problem until Nov 23, 1966, when he was struck in the right eye by a fragment of wood thrown from a power saw. Examination of the right eye at that time was described as: vision, light perception. There were lacerations of the lids, a full thickness corneal laceration with iris prolapse at the inferotemporal limbus, and