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True blindness may be caused by trauma to the eye, severe conjunctivitis due to  ibr (infectious bovine rhinoceros) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin a  deficiencies, rabies, vitamin b12 deficiency, neoplastic of the orbit or  conjunctiva, cataracts, congenital malformations, etc. 

[tex]< b> hey  /tex]meer quasim: -  he was the ruler of bangal after meer jafar . in the battle of plassey(1757ad.) sirajuddaula died and the east india company made the ruler of bangal to meer jafar and meer quasim was the son in law of mir jafar and became ruler after replacing meer jafar who himself been suported to east india company.he became ruler in 1760a.d. replacing meer jafar and he started to offense east india company so the result came as the battle of baksar ( 1764 a.d.) which was fought between meer quasim and hector munro . and meer quasim died in this battle and after this battle east india company became the ruler of bangal .robert clive : -  robert clive was the founder of britishers in india . he came in india in 1746 a.d. and was selected as commander-in-chief of british india . at that time sirajuddaula was the nawab of bangal and he banned the import from callicuta hence east india company gathered army and the result came through as the battle of plassey . the battle was fought between siraj-ud-daula and robert clive and sirajuddaula lost that battle and died .the main reason was for the defeat of sirajuddaula that meer jafar cheated him.when robert clive came in india he was just the age of 18 years but when he went back in 1772 a.d. his money was 401,102 pounds .  robert clive was sent in india to reduce cruption in east india company but when he went back to england in 1772a.d. he had to give recommendation for himself as he gathered a lots of money . and in 22 november 1774 he died .