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Cataract occurs when our lens becomes cloudy.Therefore a cataract patient's lens  is replaced by artificial lens
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bro he asked for reasons
u wrote about symptoms of cataract-what occurs when its happening
Cataract is a disease in which the lens of the eye becomes cloudy and the person who has this disease cannot see clearly
Age is main reason for cataract. It can also be caused due to serious injury to the lens.
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x cuse me bro i also wrote that only