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Dryness of the eye and allergies can cause blurry vision, as can things like fever, fatigue, and being dehydrated. If you swim without goggles and open your eyes in a pool or the ocean, that can also lead to blurry vision. Conditions like diabetes, high blood pressure, and pregnancy can affect the vision as well. Sometimes, even your eye movements during sleep can cause scratchiness or dryness on your cornea, which might lead to blurry vision.
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