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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.
Farsightedness develops in eyes that focus images behind the retina instead of on the retina, which can result in blurred vision. This occurs when the eyeball is too short, which prevents incoming light from focusing directly on the retina.