In view of subsequent events it would be difficult to find a more interesting subject of inquiry than the internal religious and sociological conditions in Samaria at this age.
Its incidence following spine surgeries exceeds that after cardiothoracic surgeries. Various causes attributed to postoperative blindness include ischemic optic neuropathy, central or branch retinal artery occlusion, cortical blindness, and rarely external ocular injury.
A relatively small number of diabetics develop the more severe, or proliferative, form of retinopathy, which can cause blindness. With its onset new, abnormal blood vessels may be formed; blood vessels may become engorged with too much blood and burst, or the retina may break loose from the back of the eye.