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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.
In addition, pupillary dilatation can cause anisocoria (greater in the light), symptomatic glare in bright light, and accommodation deficit that may cause blurred vision for near objects. Recognition of oculomotor nerve palsy is critical to ensure prompt and appropriate evaluation and treatment.