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It is a condition where the nerve cells that move information from the eye to the brain become damaged. This prevents visual information from getting to the brain resulting in loss of vision. If excessive amounts of fluid are produced in the eye and if they cannot drain away properly, the pressure inside the eye may become extremely high. The exact causes are unknown. In some cases, the drainage network of eyes may not be formed properly, or may become blocked by natural materials or due to injury. If untreated, glaucoma can cause blindness. As the nerve cells are progressively damaged, the ability to see objects in different parts of the visual field is lost. Glaucoma ca be treated but the damage cannot be reversed, although often it is possible to prevent further damage. Modern techniques have made glaucoma a rare cause of blindness in Australia. Usually you will not be aware of glaucoma until permanent loss of vision has occurred. In some cases, the increased pressure in the eye will cause blurred vision, apparent coloured rings around light, loss of side vision, and pain and redness of the eye. The optometrist uses a special instrument called a tonometer and tests the field of vision. These tests are simple and painless. You are more at risk if
- You have a blood relative who has suffered from glaucoma
- You are over 40
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