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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.
On this page: Video on blurry vision causes â¢ When blurry vision is serious Blurry vision is the loss of sharpness of eyesight, making objects appear out of focus and hazy. The primary causes of blurred vision are refractive errors â nearsightedness, farsightedness and astigmatism â or presbyopia.