Dry throat is a rough, scratchy, sometimes itchy feeling in the throat. The most common cause of dry throat is drying out of the mucus membranes, often as a result of exercise, sleeping with your mouth open, breathing through your mouth, living in a dry environment, or simply not drinking enough fluids.
Glaucoma is a group of eye diseases which result in damage to the optic nerve and vision loss. A major risk factor is increased pressure in the eye.The disorders can be roughly divided into two main categories:  open-angle  and  closed-angle  (or  angle closure ) glaucoma.econdary glaucoma refers to any case in which another disease, trauma, drug or procedure causes increased eye pressure, resulting in optic nerve damage and vision loss, and may be mild or severe. It can be due to eye injury, inflammation, a tumor, or advanced cases of cataracts or diabetes.
Topic Overview. All forms of glaucoma cause the same characteristic changes in the optic nerve, at the back of the eye, and the nerve fibers. Glaucoma causes changes in the appearance of the optic disc (notching or thinning of the edge) and changes in the nerve fiber layer (fiber defects). Moderate glaucoma refers to optic nerve damage with moderate loss of vision in at least one eye. 2  But sight in the center of the eye (central vision) is not affected. 3  Severe glaucoma refers to optic nerve damage with loss of vision in both eyes or loss of sight in one eye that includes central vision loss.