Double vision, or "seeing double," occurs when two nonmatching images are sent to the part of the brain that is responsible for processing visual input. If this occurs over the long term, the brain will eventually compensate for the two signals by suppressing one signal, so that a single image is perceived. The suppressed eye may eventually become amblyopic ("lazy eye") with resultant vision loss.
Double vision can result from impairment in any part of the vision system, including the cornea, eye muscles, lens, nerves, or the brain. The most common cause of diplopia is misalignment of the two eyes that can arise from several different conditions. Some diseases such as myasthenia gravis and Graves' disease can cause weakness of the eye muscles, leading to misalignment of the eyes and double vision. Poorly controlled diabetes can ultimately result in nerve damage that can manifest as diplopia, and diplopia can arise as a result of stroke, head injury, or other brain damage. While diplopia can be a symptom of the conditions listed below, it is not always present in these conditions.
Other causes of double vision
- Convergence Insufficiency
- Increased Intracranial Pressure
- Infection of the Cornea
- Medication Side Effects
- Rare Complication of Surgery Such as LASIK

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Causes of Double Vision
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Alcoholism and Alcohol Abuse
Alcoholism is a disease that includes alcohol craving and continued drinking despite repeated alcohol-related problems, such as losing a job or getting into trouble with the law. It can cause myriad health problems, including cirrhosis of the liver, birth defects, heart disease, stroke, psychological problems, and dementia. Counseling and a few medications can be effective for alcoholism treatment.
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Amblyopia (Lazy Eye)
Amblyopia is a vision-related condition. An eye does not acquire normal visual acuity even while using prescription eyeglasses or contact lenses. Amblyopia, often called lazy eye, develops during infancy and early childhood. Mostly, lazy eye occurs in just one eye. However, in certain circumstances, both eyes may have decreased visual acuity.
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Botulism
Botulism is an illness caused by a neurotoxin produced by the bacterium Clostridium botulinum. There are three types of botulism: food-borne, wound, and infant. Symptoms include muscle paralysis, dry mouth, constipation, slurred speech, and blurred vision. If food-borne and wound botulism are detected early enough, they may be treated with an antitoxin.
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Brain Aneurysm
A brain aneurysm (cerebral aneurysm) is caused by microscopic damage to artery walls, infections of the artery walls, tumors, trauma, and drug abuse. Symptoms include headache, numbness of the face, dilated pupils, changes in vision, the "worst headache of your life," or a painful stiff neck. Immediate treatment for a brain aneurysm is crucial for patient survival.
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Cataracts
A cataract is an eye disease that causes the eye's lens to become cloudy and opaque with decreased vision. Causes of cataracts include diabetes, hypothyroidism, certain genetic illnesses, hyperparathyroidism, atopic dermatitis, and certain medications. Cataract symptoms and signs include a decrease in vision and a whitish color to the affected eye. Treatment for cataracts may involve cataract surgery.
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Chronic Fatigue Syndrome (CFS or SEID)
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Concussion
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Head Injury (Brain Injury)
In the United States, head injuries are one of the most common causes of death and disability. Head injuries due to bleeding are generally classified by the location of the blood within the skull, these include epidural hematoma, subdural hematoma, subarachnoid bleed, intracranial bleed, sheer injury, edema, and skull fracture. Some common symptoms of a head injury include vomiting, bleeding from the ear, speech difficulties, paralysis, difficulty swallowing, and body numbness. Treatment of a head injury depends on the type and severity of the injury.
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