Blurred vision in one eye may occur slowly over time or happen suddenly. Learn 12 conditions that cause the problem, telltale symptoms, and when to seek emergency care., Medical Emergency If you experience a sudden onset of blurred vision, even in one eye, this is a medical emergency, “caused by, but not limited to, atherosclerosis, carotid artery stenosis, heart disease, hypertension and diabetes,” says Dr. Wang., One-sided eye issues, such as sudden blurry vision in one eye, can be a sign of serious conditions like retinal detachment or optic neuritis. Symptoms of sudden blurry vision may include difficulty focusing, seeing halos around lights, or sudden loss of vision in one or both eyes., Schedule an eye exam if you experience persistent blurry vision. See a doctor immediately if you experience: sudden vision changes, including blurry vision sudden vision loss in one or both eyes severe eye pain or headache flashes of light or a sudden increase in floaters difficulty speaking, weakness, or confusion along with blurry vision., Many conditions can cause blurry vision in one eye, including refractive errors, viral or bacterial infections, and migraine. Learn how to treat it, and more., The fix: The 20-20-20 rule is an easy and effective way to reduce blurry vision in one eye caused by dry eyes. Anytime you use an electronic screen, take a 20-second break every 20 minutes and .