Sometimes dilated pupils can affect your vision. While your eyes are dilated, they will be more sensitive to light than usual. If you need the medication for a health problem, ask your doctor if there’s a different drug you can try that won’t affect your eyes. Try to avoid the drug in the future, if you can. If a medicine caused your pupils to dilate, they should go back to normal once the drug wears off. You might also have imaging tests such as computed tomography (CT) or magnetic resonance imaging (MRI) scans to look for an injury or other problems in your brain. Get emergency help if you've had a head injury and your pupils look larger - especially if one pupil is bigger than the other. See your doctor or eye specialist for an exam if your pupils are enlarged and they don't get smaller in bright light. The pupil usually goes back to normal size within a few hours, but it can last for several days. You should still see your doctor to rule out anything serious. It's called "benign" because it's not related to any serious conditions, but it can sometimes affect young women who get migraines. This condition means only one pupil is dilated. That can also happen after eye surgery, such as cataract removal or corneal transplant. If you've had a head injury, your doctor or nurse might shine a light into your eye during the exam to see if your pupils get smaller.Īn eye injury can damage nerves or the muscles in your iris that control your pupil size. If that happens, you should see a doctor right away. One or both of your pupils can become fixed in the dilated position and can’t react to light. Pressure that builds inside your brain after a head injury, stroke, or tumor can damage the muscles in your iris that normally make your pupils open and close. Withdrawal from these drugs can also make the pupils stay open wide. So even in a bright room, the eyes stay dilated. These drugs affect the muscle that widens the pupil, slowing how it reacts to light.
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