Approximately 2,000,000 more have some degree of visual loss from glaucoma. Several million more people have elevated intraocular pressure. Some 20 million people in the U.S are susceptible. Glaucoma affects people of all ages and all races. Most blindness from glaucoma is needless and could have been prevented if detected and treated in time.
Most patients have no symptoms from glaucoma.
Blindness from glaucoma usually begins with loss of peripheral vision. Central vision is usually maintained until the late stages. By the time the patient notices visual loss, damage is advanced . Factors which predispose to glaucoma include myopia, black race, and a family history of glaucoma. Thyroid disease, diabetes, and high blood pressure may be associated to some degree.