Strabismus in Adults: The Eye That Drifts, the Double Vision, and the Fixable Misalignment
Last updated September 4, 2026.
Strabismus is misalignment of the eyes: one eye looks where you are looking while the other drifts in, out, up, or down. In children it is common and treatable, and untreated it feeds lazy eye, which has its own page on this site. In adults it arrives two ways: as the residue of childhood misalignment that was never fully corrected, or as something new, and new adult misalignment always deserves an explanation, because some of its causes are urgent. The part adults most often get wrong: they believe they are too old to fix it. They are not.
New misalignment in an adult: the causes that matter
A drift that appears or worsens in adulthood has a short list of important drivers: thyroid eye disease, which tightens the eye muscles; weakness of the nerves that steer the eye, from diabetes, blood pressure disease, or more serious pressure inside the head; myasthenia gravis, which fatigues the muscles; trauma; and, rarely, stroke or tumor. The urgent pattern is sudden double vision, especially with a droopy lid, headache, pupil change, or any other new neurologic symptom: that is same-day evaluation. A slow drift over years without those features is a routine referral, but still worth explaining.
An eye that drifts in adulthood: sudden double vision is a same-day symptom, but the slow childhood-residue drift is fixable at any age with prisms, injections, or surgery.
Start a free AI doctor consult →The childhood residue
The other adult presentation is the drift that has been there since childhood, perhaps corrected once and creeping back, perhaps never treated. Adults in this group usually do not see double, the brain long ago learned to ignore one eye, but they pay elsewhere: eye strain, trouble with depth judgment, and the social weight of a visible drift in photographs and conversations. The depth-perception loss is partly recoverable, and the alignment itself is correctable at any age.
What treatment looks like in adults
Three tools, matched to the case. Prisms built into glasses align the images and can erase double vision without surgery. Botulinum injections relax an overacting muscle, useful in specific patterns and as a trial. And strabismus surgery, adjusting the eye muscles under anesthesia, often with adjustable sutures fine-tuned while you are awake, realigns the eyes with high success rates, including in adults who were told decades ago that their window had closed. The benefits are functional, less strain, single vision, better depth judgment, and the social ones patients mention first. Adults seeking surgery for alignment are seeking function, and eye muscle surgeons say so too.
- Sudden double vision is a same-day symptom. Especially with a droopy lid, headache, pupil change, or other new neurologic signs. The causes range from manageable to urgent, and the timing decides.
- A childhood drift that crept back is still fixable. Adult strabismus surgery succeeds at any age, and the gains, single vision, less strain, better depth judgment, are functional, not merely cosmetic.
- Prisms and botulinum injections sit between glasses and surgery. Many adults get real relief without the operating room; the specialist visit is what sorts which tool fits your pattern.
If you are weighing the risks and benefits of any procedure mentioned here, our overview of how interventions are tested and monitored for safety explains what those conversations are built on.
What a Pymander AI doctor consult looks like
Illustrative example, not a real member's messages.
Common questions
What is strabismus?
Misalignment of the eyes: one eye points where you are looking while the other drifts in, out, up, or down. In children it is common and treatable, with untreated cases feeding lazy eye, which has its own page here. In adults it appears as a childhood residue or as something new that needs explaining.
What causes new strabismus in an adult?
The important drivers: thyroid eye disease tightening the muscles, nerve weakness from diabetes or blood pressure disease, myasthenia gravis, trauma, and rarely stroke or tumor. Sudden double vision, especially with a droopy lid, headache, or pupil change, is a same-day evaluation.
I had a lazy eye as a child. Why is my eye drifting now?
Patching treats the vision in the lazy eye but does not always hold the alignment, and childhood misalignments commonly re-emerge or drift in adulthood. The drift is correctable at any age; the re-emergence itself is common and expected, not a failure on your part.
Is strabismus surgery worth it in adults?
Yes, and adults are a large share of strabismus surgery: success rates are high, recovery is days-to-weeks of surface soreness, and the gains, single vision, less strain, better depth judgment, and the social ones, are consistently reported as life-changing. Adjustable sutures let the surgeon fine-tune alignment on the day.
Are there non-surgical options?
Prisms built into glasses align the images and can erase double vision for smaller angles, and botulinum injections relax an overacting muscle in specific patterns. The strabismus specialist matches the tool to the pattern, and many adults are managed without the operating room.
Will I see double after treatment, or lose vision?
Serious vision loss from strabismus surgery is rare. Adults whose brains suppressed the drifting eye sometimes notice temporary awareness of the second image after alignment, which usually settles; the specialist screens for this risk beforehand and it shapes the plan.