Fig. 5. Plateau iris configuration. The anterior chamber is deep axially and the iris plan is flat. The angle is open but is narrow when the pupil is small (dotted line) and closed when the pupil is dilated. (Kolker AE, Hetherington J Jr: Becker and Shaffer's Diagnosis and Therapy of the Glaucomas, p 198. St. Louis, CV Mosby, 1970)