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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.
SYMPTOMS: SUDDEN LOSS of VISION: Potential Causes; AMAUROSIS FUGAX: Temporary, monocular, ischemic blindness. Painless; Caused bu ipsilateral Carotid stenosis or embolization of the retinal artery. RETINAL DETACHMENT: Flashing lights, floating halos, and blurry vision before the blindness is indicative of retinal detachment.