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Blind the dictionary defines it in one simple word sightless The life for a blind person is extremely hard for obvious reasons When a person is blind most likely it is caused by one of three things Either the person is blind because of a birth defect which in most cases causes the person to never see life One of these disorders it called Leber Congenital Amaurosis LCA is an inherited retinal degenerative disease characterized by severe loss of vision at birth A variety of other eye-related abnormalities including roving eye movements deep-set eyes and sensitivity to bright light also occur with this disease Some patients with LCA also experience central nervous system abnormalities Another common cause is accidents in which they have lost their ability to see The third cause is actually about nine various diseases Some of the most common eye diseases are Age-related macular degeneration Retinitis pigmentosa and Usher syndrome Age-related macular degeneration AMD is a retinal degenerative disease that causes progressive loss of central vision The risk of developing AMD increases with age The disease most often affects people in their sixties and seventies AMD is the most common cause of vision loss in individuals over the age of fifty-five Retinitis pigmentosa RP is the name given to a group of inherited diseases that affect the retina They are characterized by a gradual breakdown and degeneration of photoreceptor cells 2 which results in a progressive loss of vision It is estimated that RP affects 100000 individuals in the United States Usher syndrome is an inherited disorder that is characterized by moderate to profound hearing impairment which is present at birth or shortly thereafter and progressive vision loss due to retinits pigmentosa UP a degeneration of the retina It is the major cause of deaf blindness About 10-15000 people in the United States have Usher syndrome In order to be legally blind you must have a certain
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