Is new double vision an emergency?

It can be. Call 911 if it comes with stroke signs, severe headache, pupil change, sudden vision loss, or injury.

Can dry eye cause double vision?

Dry eye can cause ghosting or smearing in one eye. It often changes after blinking or using artificial tears.

Can prism glasses help double vision?

Yes, in some stable eye alignment problems. Prism bends images so the brain can fuse them.

Should I patch one eye?

Covering one eye can help short term and can make walking safer. It does not treat the cause.

Condition

Double Vision / Diplopia

Also known as Diplopia, Double Vision, Binocular Diplopia, Monocular Diplopia, Ghost Images

Updated May 16, 2026·For educational purposes only. Not a substitute for medical advice. See our terms.

Bottom Line

Double vision means one object looks like two. New double vision can come from the eye, eye muscles, nerves, brain, or glasses, so it needs careful triage.

Double vision is also called diplopia. It can be monocular, meaning it stays when one eye is open. It can also be binocular, meaning it goes away when either eye is covered.

Binocular diplopia usually means the two eyes are not lining up. A practical approach to binocular diplopia looks for cranial nerve, muscle, orbit, and brain causes ¹.

New sudden double vision in an adult needs same-day medical advice. Double vision with face droop, weakness, trouble speaking, severe headache, or new pupil changes is an emergency ².

Monocular vs Binocular

Monocular double vision stays when only one eye is open. It often comes from dry eye, astigmatism, cataract, cornea shape, or lens problems.

Binocular double vision goes away when either eye is covered. It usually means the eyes are not aligned. A binocular diplopia update reviews eye muscle, nerve, orbit, and brain causes ².

Red Flags

Call 911 or go to the emergency room now for double vision with face droop, weakness, numbness, confusion, or trouble speaking. Also go now for severe headache, pupil change, sudden vision loss, or injury. Get same-day urgent evaluation for new adult double vision even without stroke signs.

Do not drive with active double vision. Covering one eye can reduce symptoms until you are evaluated.

Common Causes

Causes include:

Glasses or cornea problems. These often cause one-eye ghosting.
Dry eye. The image can smear or double when the tear film breaks up.
Childhood strabismus returning. A long-standing eye turn can decompensate in adults.
Cranial nerve palsy. Diabetes, high blood pressure, aneurysm, or inflammation can affect eye movement nerves.
Thyroid eye disease. Tight eye muscles can pull the eyes out of line.
Myasthenia gravis. Eye muscles can tire, causing variable double vision and droopy lids.
Stroke, tumor, or trauma. These are less common but important to rule out.

Common Questions About Double Vision

Cover one eye, then the other. If doubling goes away with either eye covered, it is binocular double vision.

Next Steps

1Cover one eye, then the other, and note whether the double vision goes away.
2Do not drive while double vision is active.
3Seek same-day care for any new adult double vision.
4Call 911 for double vision with stroke signs, severe headache, pupil change, sudden vision loss, or injury.
5Bring your glasses, medicine list, and notes about when the doubling started.

Find specialists for Double Vision / Diplopia

Board-certified ophthalmologists who treat Double Vision / Diplopia.

Browse Neuro-Ophthalmology specialists

Also relevant

Pediatric Ophthalmology Comprehensive