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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 Blurred Vision. 1  14 Warning Signs and Symptoms of Stroke Stroke is a major cause of death and disability in the US. Early identification and treatment of stroke helps reduce the risk of...learn more 2  Â». Astigmatism Astigmatism is an eye condition in which the cornea is abnormally curved and causes out-of-focus vision.