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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.
When fatty plaque deposits build up in blood vessels (due to, for example, diabetes, high blood pressure, smoking, or high cholesterol) and make them narrower, small pieces of plaque can break off from a blood vessel wall and block blood flow to the eye, causing temporary blindness. Other causes of temporary blindness include: Chemicals: Many chemicals can cause temporary blindness when sprayed in the eyes (i.e. pepper spray, mace, or even cleaning products). Conversion disorder: If you are experiencing severe psychological or emotional stress, you may experience a conversion disorder.