Fig. 13. Frequency distribution of visual field defects in eyes with chronic open-angle glaucoma. Maximum intraocular pressures ranged between 22 and 34 mm Hg. (Lynn JR, Fellman RL, Starita RJ: Exploring the normal visual field. In Ritch R, Shields MD, Krupin T [eds]: The Glaucomas. Vol 1. St Louis: CV Mosby, 1989.)