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It is degenerative disease of retina, which causes diminished night vision. Later on, there is reduced side vision but blindness is rare. The disease progresses slowly.
Cause
Cause of the disease is still unknown. It is mainly due to damage of retinal cells. Mostly the disease is hereditary. The most common inheritance is recessive. It means the gene should come from both the parents though they may not be affected. Other form is sex linked in which females are carriers. So genetic
counseling is required to prevent the disease in next generation.
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