Read the excerpt from Part 1 of The Odyssey. And this new grief we bore with us to sea:
our precious lives we had, but not our friends.
No ship made sail next day until some shipmate
had raised a cry, three times, for each poor ghost
unfleshed by the Cicones on that field.

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.