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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.
There can be many causes of hazy vision. Some examples of common causes are: abrasions to the cornea ; cataracts; corneal opacification (scarring) infectious retinitis ; macular degeneration related to age ; migraine headaches ; optic neuritis ; retinitis pigmentosa ; retinopathy, such as diabetic retinopathy stroke ; trauma or injury to the eyes