What is glaucoma: the symptoms, types, and risk factors

Although millions of Americans have glaucoma, many of them do not know. Glaucoma may cause blindness. However, it is preventable. The fluid pressure in the eyeball is called intraocular pressure. If the intraocular pressure is too high, it may block the blood flow to the optic nerve and damage the nerve. Before the problem occurs, [...] http://digg.com/u1LcQn