When it comes to your body’s response to exercise, there are some physical symptoms you should never ignore. If you’re dealing with blurry vision during or after exercise, your first step is to speak with your doctor. They can help determine if an underlying medical or health issue may be the cause. In some cases, it could be a red flag for something more serious, like a stroke, an aneurysm, or diabetes.

1. Low Blood Pressure Levels

Hypotension, or low blood pressure, is one condition that can cause you to have blurry vision. The National Institutes of Health defines low blood pressure as a pressure that is lower than 90/60 mmHg. This can happen as a sudden drop in pressure, although for some people, low blood pressure is a chronic condition.In regards to exercise, dehydration can cause your blood pressure to drop.

2. Issues With Blood Sugar

High blood sugar, or hyperglycemia, is another possible culprit that can cause your vision to blur.

When you’re hyperglycemic, your blood sugar levels are higher than normal or higher than your target level set by your doctor. And when this happens, you can experience symptoms such as blurred vision.Exercising when blood sugar levels are too high — or over 250 — can be dangerous. Make sure to monitor your levels prior to physical activity and time your workouts to start about 30 minutes after a meal, as long as your blood sugar levels are normal.Blurry vision can also be a sign of hypoglycemia, or low blood sugar, during or after a workout.

3. Optic Neuritis

If you have blurry vision in one eye after working out, it could be a sign of a condition called optic neuritis. This happens when the nerve fibers that carry images from the retina to the brain become inflamed, which causes them to not function properly.

When you’re hot or tired, optic neuritis symptoms such as blurriness in your eyes can get worse. This is often triggered by exercise or taking a hot bath.

4. Migraine

Another cause of blurry vision during exercise could be migraine. This could be the case if you have a known history of migraine. If you suspect that migraine could be the reason for your blurred vision, talk with your doctor.

When to See a Doctor

It’s important to see a doctor if you’re experiencing blurry vision after workout sessions because you may be dealing with a condition called diplopia, or double vision.Diplopia can cause you to see two images when you look at a single object. Although it’s generally temporary, it shouldn’t be ignored, as it could be related to a serious issue, such as a stroke or an aneurysm.If an ophthalmologist determines you have optic neuritis, they may recommend corticosteroids, a medicine used to treat this condition.If you have blurred vision along with other symptoms like extreme thirst, tiredness, and the need to urinate more often, talk to your doctor immediately. These could indicate that you’re at risk of developing diabetes.And if you already have a diabetes diagnosis, you could be dealing with a condition called diabetic retinopathy, which causes vision loss and blindness. One of the main symptoms of this condition is blurry vision, so make sure to let your doctor know if you’re experiencing blurred vision while working out.

Treatment and Prevention of Blurry Vision

In order to minimize or prevent blurry vision from happening, you should work with your doctor to treat the cause of blurred vision while working out.

Depending on the severity, your doctor may recommend lifestyle modifications or medications to raise your blood pressure. You can also talk with a registered dietitian to design a diet that addresses low blood pressure and its effect on exercise.