Metabolism is the process by which your body converts what you eat and drink into energy. During this complex biochemical process, calories in food and beverages are combined with oxygen to release the energy your body needs to function.
Closed-angle glaucoma is more common in women. Glaucoma has been called the silent thief of sight because the loss of vision usually occurs slowly over a long period of time. Worldwide, glaucoma is the second-leading cause of blindness after cataracts.
Normal-tension glaucoma causes. Although its cause is not completely understood, normal-tension glaucoma is generally believed to occur either because of an unusually fragile optic nerve that can be damaged despite a normal pressure inside the eye, or because of reduced blood flow to the optic nerve.1  Unusually fragile optic nerves may be inherited.lthough its cause is not completely understood, normal-tension glaucoma is generally believed to occur either because of an unusually fragile optic nerve that can be damaged despite a normal pressure inside the eye, or because of reduced blood flow to the optic nerve. 1  Unusually fragile optic nerves may be inherited.