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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.
Depending on the cause behind your condition, blurred vision can occur in both eyes, or just one, and it may be a symptom of numerous conditions that donât include the eyes at all, such as a stroke or migraine. Various medications such as Restasis can also lead to temporary blurred vision as a side effect.