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True blindness may be caused by trauma to the eye, severe conjuntivitis due to IBR (infectious bovine rhinotracheitis) or pink eye or other infections, leptospirosis, lead poisoning, selenium toxicity, fungal infections, vitamin A deficiencies, rabies, vitamin B12 deficiency, neoplasia of the orbit or conjunctiva, cataracts, congenital malformations, etc.

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