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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.
Keep in mind that many eye conditions can cause some blurred vision, including pink eye, allergies, dry eyes and even a lot of near vision work. Most of these are not emergency situations. Quick Tip: For mild blurry vision, try resting your eyes. If the blurry vision persists, make an appointment for an eye exam.