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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.
Astigmatism is a common eye problem causing blurry vision, difficulty seeing details and eye strain headaches. Ocular migraine usually refers to a type of migraine that can cause temporary blindness in one eye. Retinal detachment causes floaters in your vision, flashes of light, blind spots, loss of vision, and more. A stroke occurs when blood and oxygen to the brain are cut off, and causes numbness, confusion, and more.