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.
The elevated blood pressure causes damage to the blood vessels in the retina resulting in bleeding or fluid seepage. This can further lead to separation or detachment of the retina resulting in blindness. Retinal degeneration can also cause blindness and results in a loss of the light sensory cells in the retina. Though this is generally a slow and progressive disorder, the final stages of loss of vision can seem sudden.