Primary or chronic open angle glaucoma is a painless condition usually associated with high pressure in the eye. It affects approximately four per cent of all people over the age of fifty. Untreated, glaucoma is a major cause of blindness worldwide. Glaucoma: A Patient's Guide to the Disease offers essential information about glaucoma and its treatment, presented in a simple question and answer format to allow patients to participate actively in the decision-making process along the road to successful maintenance of their vision. The fourth edition has been updated with the latest medical and surgical advancements in diagnosing and treating the disease, including information on new imaging techniques. Graham E. Trope provides the answers to dozens of commonly asked questions in sections headed 'All About Glaucoma,' 'Tests for Glaucoma,' and 'All About Treatment.' Also included are discussions of possible complications, detailed illustrations, and a listing of glaucoma societies in Canada, the United States, and United Kingdom. This valuable guide is an essential reference not only for patients but for all health-care professionals, including general practitioners and optometrists.