Double Vision
What is Double Vision?
Overview
Double vision, medically known as diplopia, is a visual condition where a person sees two overlapping images of a single object instead of the normal single, fused image.
These images may appear side-by-side, one above the other, or diagonally displaced. Double vision can affect one eye (monocular diplopia) or both eyes (binocular diplopia), and it may be constant or occur only intermittently.
This symptom can result from problems with the eyes themselves, the muscles that control eye movement, the nerves that transmit signals to those muscles, or parts of the brain that process vision. Causes range from relatively minor issues, such as dry eye or uncorrected astigmatism, to more serious conditions, such as cranial nerve palsy, stroke, or brain tumors.
Because double vision can sometimes signal a neurological or medical emergency, it’s important to seek prompt evaluation—especially if it occurs suddenly or is accompanied by other symptoms like headache, facial weakness, or difficulty speaking.
Who is Affected?
Double vision can affect people of all ages and backgrounds, depending on the underlying cause. It is a symptom rather than a disease itself, and many different medical conditions—ranging from common eye problems to serious neurological disorders—can lead to diplopia. Below are some of the primary conditions known to cause double vision:
- Strabismus
- Orbital inflammation, including thyroid eye disease (TED)
- Cranial nerve palsy
- Multiple sclerosis
- Myasthenia gravis
- Orbital injury
- Stroke
- Brain tumor
- Inflammation
- Vascular malformation
- Aneurysm
Double Vision Symptoms & Causes
Symptoms
Double vision is characterized by two images that are either separate or overlapping. The double vision may vary during the day, being most distinct when the eyes are tired. It is important to note that double vision can be a symptom of various underlying medical conditions, some of which may be serious.
Causes
Double vision can be caused by various underlying factors, which can be broadly categorized into two main types: binocular diplopia and monocular diplopia.
This type of double vision occurs when both eyes are open and working together, but they are not properly aligned. Common causes of binocular diplopia include:
- Strabismus: Strabismus is a misalignment of the eyes, where one eye may turn inward, outward, upward, or downward. This misalignment disrupts the normal coordination of the eyes and results in double vision.
- Cranial Nerve Disorders: Damage or dysfunction of the cranial nerves that control eye movements (e.g., oculomotor, trochlear, and abducens nerves) can lead to difficulty in coordinating eye movements, causing double vision.
- Refractive Errors: Significant differences in refractive errors (such as a large difference in prescription between the two eyes) can cause binocular diplopia when attempting to focus on objects.
- Head Injury or Trauma: Trauma to the head, especially around the eye sockets, can damage the eye muscles or the nerves controlling them, resulting in double vision.
- Myasthenia Gravis: This autoimmune disorder affects the neuromuscular junction and can lead to muscle weakness, including the muscles that control eye movements.
Monocular diplopia occurs when the double vision persists even when one eye is covered. It is typically related to issues within a single eye, and common causes include:
- Refractive Errors: Uncorrected or undercorrected refractive errors like nearsightedness (myopia), farsightedness (hyperopia), or astigmatism can cause double vision in one eye.b.
- Cataracts: Advanced cataracts can scatter and distort incoming light, causing double vision in one eye.
- Dry Eye Syndrome: Insufficient tear production or poor tear quality can lead to blurred vision and ghosting of images in one eye.
- Corneal Abnormalities: Irregularities in the cornea, such as keratoconus or scarring, can cause monocular double vision.
- Macular Disease: Conditions affecting the macula, the central part of the retina responsible for sharp central vision, can result in double vision in one eye.
When to See a Doctor
Anyone experiencing persistent or sudden double vision should seek prompt evaluation by an eye care specialist or a healthcare provider. A comprehensive eye examination and, if necessary, further medical assessments can help determine the cause of double vision and guide appropriate treatment. Contact our specialists at 310-829-8701 for an appointment.
Double Vision Diagnosis
If double vision occurs when only one eye is open, it generally is due to eye problems such as astigmatism, corneal irregularity or cataract, but if double vision persists when both eyes open, but resolves when looking with only one eye, the cause may be orbital, muscular or neurological. This type of double vision is caused by a misalignment of the lines of sight of the two eyes. Diagnostic evaluation will include eye examination, sensorimotor examination and may include orbital ultrasound evaluation. Additional diagnostic studies may be indicated, including blood tests, CT or MRI.
Double Vision Treatment & Outcomes
Treatment Options
Medical issues, such as diabetes, high blood pressure, prior strokes or heart disease, cancer, or other neurological or medical conditions may lead to double vision; therefore treatment depends on the underlying cause of the double vision.
Temporarily, vision in one eye may be blocked by the use of an eye patch or covering one lens of the patient’s glasses. In some instances, prisms may help reduce the double vision. If double vision persists when both eyes are open, surgery to adjust the position of the eye muscles may be recommended, and is generally very successful in restoring single binocular vision.
Patient Outcomes
The outlook for double vision depends on its cause, how quickly it is diagnosed, and whether the underlying condition is treatable. In many cases, such as those due to refractive errors, eye muscle imbalance, or certain nerve palsies, treatment can restore single vision and prevent recurrence. When double vision is caused by temporary issues such as infection, inflammation, or thyroid eye disease, vision often improves once the underlying problem is managed.
In more complex cases related to neurological conditions, brain injury, or chronic illness, some degree of double vision may persist. However, most patients can achieve significant improvement in comfort and function through corrective lenses with prisms, vision therapy, or surgical intervention. Prompt treatment improves outcomes and reduces the risk of permanent visual disruption.
Managing Double Vision
Living with double vision can be challenging, but there are ways to manage symptoms and maintain quality of life while treatment is underway:
Follow Your Treatment Plan
Take prescribed medications, use corrective lenses or eye patches as recommended, and attend follow-up appointments.
Adjust Your Environment
Improve lighting at home, reduce visual clutter, and mark steps or uneven surfaces to reduce fall risk.
Modify Daily Activities
Avoid driving until cleared by your physician. Use handrails, avoid sudden head movements, and take breaks if your eyes feel strained.
Maintain Overall Health
Control blood sugar, manage blood pressure, and address other medical conditions that could impact your vision.
Protect Your Eyes
Wear safety glasses during activities that pose a risk for eye injury.
Support from family, friends, and vision rehabilitation services can help you adapt to changes while working toward recovery.
Meet our Expert Specialists & Surgeons
Experience Compassionate, Expert Care
At Pacific Neuroscience Institute, our neuro-ophthalmology specialists determine the cause of your double vision and create a personalized treatment plan. Our team has extensive expertise in managing complex eye movement disorders, including those related to neurological and orbital disease.
With access to state-of-the-art diagnostic imaging, advanced surgical techniques, and specialized rehabilitation programs, we offer comprehensive care in a supportive environment. Many patients travel from across the region for our expertise in rare and challenging cases.
Learn More About Double Vision
The prognosis varies based on the underlying cause. Many cases are fully reversible with proper treatment, while others—especially those related to neurological disease—may require long-term management. Early diagnosis and intervention generally lead to better outcomes.
Yes. A macular hole affects the central part of the retina and can cause distorted or double images in one eye (monocular diplopia).
Sudden onset double vision, especially when accompanied by headache, difficulty speaking, weakness, or facial droop, may be a sign of a stroke or other urgent neurological condition. Seek immediate medical care.
Myasthenia gravis, multiple sclerosis, and thyroid eye disease (Graves’ disease) are autoimmune conditions that can affect the eye muscles or nerves, leading to double vision.
A phoria is a latent eye misalignment that is usually controlled by the brain’s visual system. If control is lost due to fatigue, illness, or injury, it can decompensate into double vision.
Sudden double vision can be caused by nerve palsies, stroke, aneurysm, infection, or trauma. Immediate evaluation is essential to rule out serious causes.
Blurred vision, ghosting from astigmatism, or visual disturbances from migraine can sometimes be mistaken for double vision.
If double vision is associated with abnormal eye movements, drooping eyelid, facial weakness, imbalance, or other neurological symptoms, it may be due to a brain or nerve disorder.
Vitamin B12 deficiency can affect the nervous system and may cause double vision along with other neurological symptoms.
Resources
Get Expert Care from Leading Specialists
If you are experiencing double vision, it’s important to find out why—both for your vision and your overall health. At Pacific Neuroscience Institute, our specialists combine advanced diagnostics with personalized care to help you regain clear, comfortable sight.