In short. A muscle-relaxing injectable into the orbicularis oculi: what it does to the fold, why the lines soften rather than vanish, and the lid and smile trades it carries.
Key points
- The orbicularis oculi closes the lid and moves the tear film across the eye.
- Enough reduction softens the crease; too much leaves a lid that does not close comfortably and an eye that feels dry and gritty.
- The effect is aimed at the one that is wanted and taken no further.
One rung of the ladder acts on the cause rather than on what is left of it. A botulinum toxin of the A type, given into the orbicularis oculi at the outer corner, reduces the pull of the muscle that folds the skin. It is also the rung with the least room for error here.
What the class does at this site
The toxin reduces the signal reaching the muscle from the nerve ending that supplies it, so the ring contracts less when you smile or squint. The skin it was gathering is no longer folded, the crease flattens in movement, and the lines at rest soften as well.
Why the lines soften rather than vanish
Reducing the muscle reaches the fold, not the skin. What is visible with the face completely still is a change in a dermis that has lost collagen and elastin in the thinnest skin on the face. Quieting the muscle stops the skin being folded, so a resting line looks softer after some months. It does not rebuild what was lost.
Aimed at rather than maximised
The orbicularis oculi closes the lid and moves the tear film across the eye. Enough reduction softens the crease; too much leaves a lid that does not close comfortably and an eye that feels dry and gritty. The effect is aimed at the one that is wanted and taken no further.
The trade at the lid and the tear film
The muscle runs in a ring around the eye, and the part that makes the lines also helps the lid sit against the surface. Reduce its pull too far and the lower lid can sit differently, the eye can water or feel gritty, and closure can become less complete during sleep. Dry eye, or a lid that already sits loose, changes whether this rung is reasonable at all.
The smile, and the rest of the ring
The outer portion is also what narrows the eye in a genuine smile and lifts the cheek slightly as it does. Reducing it can leave a smile that reads differently, sometimes fresher and sometimes flatter. The brow position is recorded for the same reason.
What is recorded before it is given
How completely the eye closes, where the lid edge sits, how wet the eye is, and where the brow sits. Those findings decide whether this rung applies, where it is placed and how much of the ring is treated.
Findings that need the treating team
- A drooping lid, double vision, or difficulty swallowing, speaking or breathing after treatment needs emergency care.
- An eye that has become persistently dry, gritty or painful, or a lid that no longer closes comfortably.
- Weakness spreading beyond the face, or a rash with breathlessness, needs urgent assessment.
What separates the muscle component from the skin component is set out in muscle lines and skin lines at the eye corner. The rung that addresses a hollow rather than a line is described in filler near the eye corner.
Frequently asked questions
Will my smile look different after the outer corner is treated?
It can, and the change is worth describing in advance. The outer part of the ring is what narrows the eye in a genuine smile and what lifts the cheek a little as it does. Reducing its pull can leave a smile that reads fresher to one person and flatter to another. Faces that show a lot of eye movement at rest are the ones most likely to notice, which is why the resting face is looked at before anything is given.
How does dry eye change whether the eye corner can be treated?
It changes how much of the ring is reasonable to reduce, and sometimes whether it is reasonable at all. The muscle helps spread the tear film and helps the lid sit snugly against the surface. In an eye that is already dry, a reduction that leaves the lid closing less completely can turn a manageable irritation into a daily problem, so a dry eye history is one of the findings that alters the plan rather than a footnote to it.
Why is only the outer part of the ring treated rather than the whole muscle?
Because the parts have different jobs. The thin portion within the lids closes the eye and sweeps the tear film across it with every blink; the thicker portion around the rim produces the hard squint and the fold at the corner. Treating the whole ring would reach the crease and take the function with it. The plan works on the part that makes the lines and leaves the part that protects the eye alone.
Risks & Limitations
- Nothing erases crow's feet. The lines soften with treatment and return as the orbicularis oculi keeps folding the skin.
- Reducing the pull of the muscle at the eye corner can affect lid closure, the tear film and the position of the brow.
- Material placed near the eye corner can show through thin skin, and this is one of the least forgiving areas of the face.
- Resurfacing thin periorbital skin carries a risk of pigment change, redness that persists and, rarely, scarring.
- Treatment in this area is repeated rather than completed, and the decision is remade each time the movement returns.
When to Seek Care
- Difficulty breathing or chest pain — seek emergency care immediately.
- A change in vision, double vision, or pain on moving the eye after treatment to this area.
- An eye that has become dry, gritty or painful, with a lid that no longer closes comfortably.
- Lines that have appeared on one side only, a lid that has begun to droop, or a brow that has fallen.
- A new lump or swelling at the corner of the eye, or a patch of skin that bleeds, crusts or does not heal.
References & Further Reading
- American Society of Plastic Surgeons (ASPS) — procedure and safety guidance
- National Institute for Health and Care Excellence (NICE, UK) — relevant guidance
- Cochrane Library — systematic reviews
- Chinese Medical Association Plastic Surgery Branch — clinical guidance
This page is patient education, not medical advice, and it does not cite individual studies. Discuss your own case with a qualified clinician. To arrange an assessment at Chongqing West District Hospital, see Contact & Consultation.