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Binocular diplopia is double vision that you see only when both eyes are open. It stops when you cover one eye. This happens because your eyes are not lined up together. Your brain gets two different images and cannot merge them into one clear view.
read more about binocular diplopia ...The main cause is strabismus, which means the eyes are misaligned. Other health problems can also cause it by affecting the nerves or muscles that control the eyes. These can include diabetes, thyroid disease, multiple sclerosis, or a head injury. When your eye muscles do not work as a team, you see double.
The main symptom is seeing two images of one object. The images can appear side-by-side or one above the other. You might also feel dizzy, have headaches, or get eye strain. Some people tilt their head to try to see a single image.
Treatment depends on the cause. An eye doctor must first find the source of the problem. Common treatments include prism glasses to help align the images for your brain. Eye exercises can also help make eye muscles stronger. Sometimes, an eye patch or surgery is needed to align the eyes.
If you have binocular or monocular diplopia, you can perform a simple check at home. Focus on a stationary object, like a doorknob or a clock. Cover one eye with your hand. If the double image disappears and you see clearly with the single open eye, it is likely binocular diplopia. This confirms the issue is misalignment between the two eyes. If the double vision persists even when one eye is covered, it is monocular, suggesting an issue with the lens or cornea of that specific eye.
The direction of the double images gives doctors a clue about which muscle or nerve is affected.
Horizontal Diplopia - Images appear side-by-side. This usually involves the muscles that pull the eye inward or outward (often related to the 6th cranial nerve).
Vertical Diplopia - Images appear stacked one on top of the other. This often points to issues with the 4th cranial nerve or thyroid eye disease.
Yes, sudden double vision can be a sign of a serious health problem, like a stroke. You should see a doctor immediately to find out the cause.
Binocular diplopia happens with both eyes open and goes away if you cover one eye. Monocular diplopia is double vision in just one eye, and it stays even if the other eye is covered. It is usually caused by an issue inside the eye, like a cataract.
Yes. Fixing the problem that causes it often corrects the double vision. Treatments like prism glasses, eye exercises, or surgery can help you see a single image again.
Go to a doctor right away if you suddenly see double. It can be a sign of a dangerous health problem. You should also see an eye doctor if the double vision comes on slowly or appears on and off. A doctor can find the cause and suggest the right treatment.
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3. When Is Diplopia a Sign of Something Dangerous? American Academy of Ophthalmology. https://www.aao.org/young-ophthalmologists/yo-info/article/when-is-diplopia-a-sign-of-something-dangerous. April 15, 2022.
4. What Is Adult Strabismus? American Academy of Ophthalmology. https://www.aao.org/eye-health/diseases/what-is-strabismus. September 9, 2024.
5. Sixth Nerve Palsy: Causes, Symptoms & Treatment. Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/sixth-nerve-palsy. December 19, 2023.