Know that diabetes and retina detachment can cause blindness as well. But what else?

Painful Blindness. The most advanced diabetic retinopathy cases lead to painless vision loss (tractional retinal detachment) however; eventually the proliferative disease reaches the iris and angle. This new vessels lead to neovascular glaucoma, which is very painful. Patients with proliferative diabetic retinopathy should be followed several times a year.
Many things. But some other common causes of blindness would include cataracts, injuries to the eye, glaucoma, macular degeneration, infections, and tumors around the eye or in the part of the brain that processes visual information.