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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.
Dryness of the contact lenses or the eyes. When dryness is the cause of the blurred vision, the vision usually gets a little clearer immediately after a blink or after putting in a contact lens rewetting drop. So if you havenât blinked in a while, give that a try ya weirdo.