Blindness can be termed as loss of complete sight or loss of useful sight, it may be permanent or temporary blindness is caused by injury or disorder in eyes, optical nerve (nerve which carries information to brain ) or the portion of the brain which handles the operation of visual and sight.
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can be termed as reduced vision which can't be corrected by glasses
and diseases related with blindness are cataracts and glaucoma .. that's it rest is out of my bio knowledge
oh.. okei ;) thx ;)