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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.
1 Myopia (Nearsightedness). 2  Myopia is blurred vision that occurs when the eye's focusing mechanism brings light to a focus in front of the retina, usually because the eyeball is very elongated in shape. 3  Eyeglasses or contact lenses correct myopia but do not slow or alter its progression.