Sudden changes in society are often described as revolutions. Advances in technology can result in revolutions in science and the workforce. Dissatisfaction with a government can lead to a political revolution. Under what circumstances is it likely that these changes will occur? Are there circumstances in which these changes should not occur?

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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.