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Blindness means when someone loss his/her observable sensation. Blindness can be due to any physiological and neurological factors. Most sight defilement is caused by some diseases like glaucoma, cataracts, diabetic retinopathy. Diabetic patients have more chances to loss their eye sight. There is another kind of blindness is night blindness. Which causes due to lack of vitamin A and the person who are suffering from this kind of blindness cannot see in the dim light and darkness. Signs of night blindness are dry eyes, dim sight.
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