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What is Glaucoma Glaucoma is one of the leading causes of permanent blindness around the world that is preventable This disease takes away the sense of sight slowly and there are no warning signs most of the time The damage caused is permanent and cannot be reversed With the correct eye care there will be little vision loss Glaucoma is caused by the pressure inside the eye being elevated causing lack of blood flow to the optic nerve thereby causing the vision loss There are two main types of glaucoma There is chronic simple open-angle and acute angle-closure In chronic simple the pressure in the eye goes up gradually and vision loss will be over a period of years In acute the pressure goes up rapidly and medical treatment is needed to preserve the vision The more common of the two is chronic simple or open-angle The nerve cells that are lost due to glaucoma are called ganglion cells Each of these cells has a long fiber that connects it to the brain As these cells die the nerve fibers are then lost When this happens the nerve fiber layer gets thinner This causes an empty space in the optic nerve which is the cup of the optic nerve to become larger until the nerve is completely gone This is what the ophthalmologist goes by to determine the amount of damage caused by this disease Ritch and Liebmann altsupportglaucoma 2002 The definition that is in the encyclopedia is as follows an eye disease caused by raised pressure inside the eye Websters Family Encyclopedia 1989 vol 5 p 107 Glaucoma is the result of a variety of diseases Bacteria viral or degenerative factors do not cause glaucoma It is caused from a combination of anything that stops the blood flow from getting to the eye and the optic nerve A progressive optic neuropathy is characterized by a specific pattern of optic nerve head and
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