National Eye Institute
The federal research agency for vision and eye health, offering plain-language patient information on every major eye condition.
Visit SiteWhat am I seeing?
Side-by-side.
A second copy offsets horizontally to the left or right.
Stacked.
A second copy sits directly above or below the first.
Diagonal.
The copy drifts sideways and up or down at the same time.
Tilted.
One image is rotated, so the two copies sit at an angle to each other.
“I have to close one eye just to pour my coffee“
Double Vision
What’s happening to vision?
This web experience is intended for educational and empathy-building purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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Double vision, known clinically as diplopia, occurs when a single object is perceived as two images. It may happen because the eyes are not aligning properly or because of an optical problem within one eye.
Normally, the brain fuses two slightly different views from each eye into one coherent scene. When that fusion breaks down, either from a misalignment between the eyes or an optical problem inside a single eye, the result is two overlapping copies of everything you look at.
Double vision can appear suddenly, as a symptom of a stroke or nerve palsy, or gradually, as muscles or nerves weaken over time. Because sudden or unexplained double vision can signal a serious underlying condition, it should be evaluated promptly.
What changes
Small things suddenly aren’t.
01
Reading becomes exhausting:
Text duplicates and overlaps, forcing constant refocus.
02
Depth perception fails:
Pouring water, pressing buttons, stepping off curbs—all become unreliable.
03
Faces double:
Recognizing someone means looking at two of them.
04
Nausea and fatigue set in:
The brain's effort to fuse two images causes headaches, dizziness, and eye strain.
Conditions that cause this
What's behind this?
Many different conditions can affect the way you see. Here are some of the conditions commonly associated with this type of visual change.
- Conditions that may require urgent care.
- Brain aneurysm or tumor
- Keratoconus
- Decompensating strabismus
- Myasthenia gravis
- Giant cell arteritis
- Stroke or transient ischemic attack (TIA)
- Cranial nerve palsies
- Thyroid eye disease
Treatment & support
Can it be treated?
Many causes of double vision are treatable, and some resolve on their own. Microvascular nerve palsies, particularly those caused by diabetes or hypertension, often recover within six months without intervention. Myasthenia gravis and thyroid eye disease respond to medication.
Prism lenses can realign images for people with persistent misalignment, and surgery can correct eye muscle imbalance in cases that don't resolve otherwise. Monocular diplopia from cataract or corneal issues is often corrected with surgery or updated lenses.
Strokes and aneurysms require emergency treatment, and recovery of vision depends on how quickly care is received.
Clinical Trials
Explore ongoing research and trials that might be right for you.
Visit clinicaltrials.govResources & helpful links