Canthoplasty is a surgical procedure that reshapes the corner of your eye where the upper and lower eyelids meet. That corner is called the canthus, and the surgery works by detaching, shortening, and reattaching the tendon that holds your eyelid in place. It can be done for purely cosmetic reasons, like changing your eye shape, or for functional ones, like correcting a sagging lower lid that exposes too much of the white of your eye.
What the Surgery Actually Does
The outer corner of each eye is anchored to the bone of your eye socket by a small tendon. Over time, that tendon can stretch and loosen, letting the lower eyelid sag or pull away from the eyeball. Canthoplasty addresses this by cutting through the muscle around the eye, detaching the tendon from the bone, trimming it shorter, and then reattaching it at a new, tighter position on the rim of the eye socket.
The exact point where the tendon gets reattached depends on your eye anatomy. For most people, it’s secured at the level of the pupil’s center. If your eyes sit deeper in the socket, the attachment point shifts lower. If your eyes are more prominent, the surgeon places it higher. This level of customization is what makes canthoplasty more involved than simpler eyelid tightening procedures. Excess skin, muscle, and tissue from the inner lining of the eyelid are also removed during the process to allow clean repositioning.
Cosmetic vs. Functional Reasons
On the cosmetic side, people seek canthoplasty to lift the outer corner of the eye, reduce a downward tilt, correct asymmetry between the two eyes, or create a more almond-shaped appearance. It’s one of the more dramatic options available for changing eye shape, and it produces lasting structural changes rather than subtle tweaks.
On the functional side, surgeons use canthoplasty to treat several specific conditions. Ectropion is when the lower lid turns outward, exposing the inner surface. Entropion is the opposite, where the lid turns inward and the lashes rub against the eye. Lagophthalmos means the eyelids can’t fully close, which leaves the cornea vulnerable to drying and damage. Trauma to the eye area can also leave the eyelid structure unstable enough to need surgical reconstruction. In all these cases, the goal is restoring proper eyelid tension so the lid sits flush against the eyeball and moves normally.
Canthoplasty vs. Canthopexy
These two procedures are often mentioned together, and the distinction matters if you’re weighing your options. Canthopexy reinforces the existing tendon structure using sutures, without actually cutting the tendon free. It works well for mild looseness where the eyelid just needs a bit of extra support and the outer corner is already close to where you want it.
Canthoplasty is the more aggressive option. Because it fully detaches and repositions the tendon, it can correct more significant laxity and produce more noticeable changes in eye shape. That added power comes with a higher risk profile and a longer recovery. The lateral tarsal strip technique, one of the most common forms of canthoplasty performed today, remains the preferred approach for severe lid laxity or ectropion where real shortening of the eyelid is necessary to get adequate tightening.
Who Is a Good Candidate
The best candidates have a clear, specific concern they can describe to their surgeon, whether that’s a drooping lower lid, visible white below the iris, or an eye shape they want adjusted. Surgeons assess the degree of tendon laxity, the position of the eyeball within the socket, the quality and amount of excess skin, and the underlying bone structure of the midface. People with poorly developed cheekbone structure and eyes that already sit low are at higher risk of the lid pulling down further after surgery, so they need particularly careful evaluation.
Certain expectations are considered red flags. Wanting no visible eyelid crease at all, planning to return to a demanding job the next day, or booking travel within the first week after surgery all suggest a mismatch between expectations and reality. Patients who have already had eyelid surgery and look overcorrected but want further changes also warrant extra caution. Before the procedure, your surgeon will ask about heart disease, thyroid conditions, diabetes, bleeding disorders, tendency to form raised scars, and any medications you take. Blood-thinning medications and supplements typically need to be stopped well before the surgery date.
What Recovery Looks Like
Canthoplasty is performed under local anesthesia, sometimes with sedation. The procedure itself typically takes one to two hours. Afterward, expect bruising and swelling around the eyes that gradually improves over two to three weeks. Stitches are usually removed within one to two weeks. Most people can return to normal daily activities within two weeks, though strenuous exercise and anything that raises blood pressure in the face should be avoided longer. The final shape of the eye continues to settle over several months as swelling fully resolves and the tissues heal into their new position.
During recovery, you’ll likely be advised to keep your head elevated, apply cold compresses, and avoid rubbing your eyes. Vision may be slightly blurry from ointment applied to protect the surface of the eye. Some tightness or pulling sensation at the outer corner is normal and fades as the area heals.
Potential Risks
Complications from canthoplasty are relatively uncommon but worth understanding. The most significant risk is recurrence of the original problem. In one study of canthoplasty performed for ectropion repair, about 24% of patients developed some degree of recurrent ectropion that didn’t cause symptoms, while 5% needed a second surgery to fix it. Other possible complications include disruption of the outer corner’s natural angle, rounding of the canthus instead of a sharp corner, loss of eyelashes near the incision site, overlapping eyelids, and scarring. Infection and significant bleeding are rare.
Asymmetry is another concern. Because the procedure involves precise repositioning measured in millimeters, even small differences in healing between the two eyes can produce a noticeable imbalance. This is why many surgeons recommend operating on both sides during the same session when cosmetic symmetry is the goal.
Cost Considerations
Canthoplasty pricing varies widely depending on the surgeon’s experience, geographic location, and whether it’s combined with other procedures like blepharoplasty (eyelid lift). For reference, the average surgeon’s fee for cosmetic eyelid surgery runs about $3,400 to $3,900, but that figure covers only the surgeon’s time. Anesthesia, facility fees, and pre-operative testing add to the total. When canthoplasty is performed for a documented functional problem like ectropion or corneal exposure, insurance may cover part or all of the cost. Purely cosmetic canthoplasty is almost always out of pocket.