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When there is no area pain during an incident of sudden patchy vision, the causes for the issue may be internal rather than external irritants. Some systemic problems that lead to the onset of blurred vision can include: 1  Vascular problems â including high or low blood pressure, or obstruction of a blood vessel.
Causes Of Sudden Temporary Blindness. The medical condition of temporary blindness is characterized by the sudden loss of vision. Fortunately, this medical condition can be rectified with proper and timely medical assistance. There are several causes for the development of this condition that include cataract, glaucoma, optic nerve problem, presence of a foreign body in the eye, hypertension, TIAs, blood occlusion, and tumor in brain.