Non-Incision vs Full Incision: Key Differences
Double eyelid surgery — known in Korean as 쌍꺼풀 수술 (ssangkkeopul susul, literally “double eyelid surgery”) — creates a defined upper eyelid crease where none exists, or deepens a faint natural crease. Two established techniques differ in how the crease is formed, how long it lasts, and who is a suitable candidate for each.
Non-incision, also called DST (double suture and twist) or buried suture, threads fine sutures through small puncture points to mechanically attach the skin to the underlying tarsal plate (the firm connective tissue that gives the eyelid its shape), creating a crease without any skin removal. Full incision cuts precisely along the planned crease line, allows direct removal of excess skin and fat, and permanently anchors the crease to the levator muscle (the muscle responsible for lifting the eyelid) or tarsal plate.
A partial incision technique sits between the two — two or three small cuts allow limited fat removal while minimising the scar length — but is less commonly recommended for patients with significant skin excess.
| Technique | Surgery time | Recovery (presentable) | Permanence | Best for | Not suitable for |
|---|---|---|---|---|---|
| Non-incision (DST / buried suture) | 30–45 min | 1–2 weeks | Variable — sutures can loosen; 10–30% crease loss over 10 years | Thin eyelid skin, minimal fat, no ptosis, young patients, faint existing crease | Thick or oily skin, significant fat pads, ptosis, prior failed non-incision |
| Full incision | 60–90 min | 3–4 weeks | Permanent — crease anchored to levator or tarsal plate | Excess or thick skin, significant fat, ptosis, older patients, revision after failed non-incision | Patients unwilling to accept 3–4 week visible recovery or a fine scar along the crease |
| Partial incision | 45–60 min | 2–3 weeks | More stable than non-incision; less predictable than full incision | Mild fat excess with thin-to-moderate skin, patients wanting shorter scar than full incision | Significant skin excess, severe ptosis, patients requiring extensive fat removal |
Ptosis Correction: When It Must Be Combined
안검하수 (angeomhasu, ptosis) refers to a drooping upper eyelid caused by weakness in the levator muscle — the muscle that lifts the eyelid open. It is more prevalent in Asian patients than has historically been recognised, and Korean surgeons routinely assess for it at every eyelid consultation.
Three signs suggest ptosis requiring correction: the upper eyelid rests low enough to partially cover the pupil (the coloured part of the eye); the two eyelids open to noticeably different heights when looking straight ahead; or the patient habitually raises their eyebrows to compensate for a lid that doesn’t lift fully on its own. Chronic brow raising causes forehead tension and can eventually affect brow position.
The surgical correction — levator resection or advancement (shortening or repositioning the levator muscle to increase its lifting force) — is performed through the same incision used for full incision double eyelid surgery, adding approximately 30–45 minutes to total operating time.
Performing double eyelid surgery without correcting underlying ptosis produces a predictably poor result: the crease forms correctly, but the eyelid opening remains small, asymmetric, or effortful. Korean surgeons who identify ptosis at consultation will recommend combined correction rather than staging the procedures. Patients who request non-incision and have concurrent ptosis are redirected to full incision — there is no non-incision route for levator repair.
KSPRS board certification requires surgeons to complete a full plastic surgery residency covering oculoplastic procedures including ptosis repair.¹
Crease Design: Height, Shape, and What to Discuss
Crease design is agreed before surgery using markings applied to the eyelid with the patient upright and eyes open. Three variables define the result.
Height is measured from the lash line to the crease and is typically set at 6–8 mm for a natural-width result or 8–10 mm for a more defined crease. Heights above 10 mm carry a higher risk of an unnatural appearance on Asian eyelid anatomy.
Shape falls into three common categories. A parallel crease maintains consistent height from inner to outer corner — this is the most natural-reading result for most Asian faces. A tapered crease narrows toward the inner corner, producing a softer, traditional look. A flare crease widens toward the inner corner, creating a more open medial appearance that has been popular among younger Korean patients.
Depth — how visibly defined the crease appears — is partly determined by how much fat is left underneath. Patients who want a subtle crease may request conservative fat management even in full incision cases.
Epicanthal fold anatomy affects crease design: a prominent fold (the skin overlapping the inner corner of the eye) can make a parallel crease appear tapered. Surgeons assessing whether epicanthoplasty is needed consider this interaction before finalising crease design.
Bring close-up reference photographs of natural eyelid creases you find proportionate to your face. Surgeons use these as a calibration point, not a replication target — exact duplication of another person’s anatomy is not achievable or appropriate.
Recovery and What to Expect
Recovery timing differs substantially between techniques. Non-incision patients return to daily activities in 1–2 weeks; full incision patients require 3–4 weeks before appearing socially presentable, with residual swelling visible for up to 3 months and a final settled crease at 3–6 months.
Peak swelling and bruising. Stitches remain in place. Cold compresses reduce swelling. Avoid bending forward, strenuous activity, and alcohol. Sleep with head elevated.
Stitch removal appointment. Sutures come out at this visit for both non-incision and full incision cases. The crease appears high and over-defined at this stage — this is normal.
Non-incision patients are typically presentable with makeup from day 7–10. Full incision patients still show visible bruising and swelling. Light activity resumes.
Full incision patients become socially presentable. Residual swelling continues. The crease remains higher and more defined than the final result — do not assess the outcome at this stage.
Crease height and definition settle progressively. Scar along the incision line fades from pink to skin tone. Most patients feel comfortable in social and professional settings.
Final appearance. Crease softens and integrates with natural eyelid movement. This is the appropriate point at which to evaluate the surgical result and discuss revision if needed.
Is double eyelid surgery permanent?
Full incision double eyelid surgery creates a permanent crease — the incision anchors the skin to the levator muscle or tarsal plate, and this attachment is stable long-term. The crease can change slightly with age as skin laxity increases, but the fundamental result is permanent. Non-incision (buried suture) double eyelid is less reliably permanent — the sutures can loosen over time in patients with thick or oily eyelid skin. Studies show non-incision crease loss rates of 10–30% over 10 years. Patients with thin eyelid skin and minimal fat tend to have stable long-term results with non-incision; those with heavier lids may require revision to full incision eventually.
How do Korean surgeons assess which technique I need?
Korean surgeons assess: (1) Eyelid skin thickness — pinch the skin between finger and thumb; thin skin is translucent, thick skin is opaque; (2) Fat distribution — prominent fat pads require incision to remove or reposition; (3) Levator function — the surgeon asks you to look up and measures how far the eyelid lifts; weak levator indicates ptosis that needs repair; (4) Existing crease — monolid (no crease) vs faint crease vs asymmetric crease each require different planning; (5) Age and skin elasticity — older patients with skin excess need incision to remove it. Virtual consultations with photograph submission (full-face + close eyelid photos in neutral light) allow Korean surgeons to assess candidacy before your arrival.
Will double eyelid surgery look natural on my face?
In experienced hands, double eyelid surgery is designed to look natural — the crease height, shape, and width are planned for your face proportions, not a standard template. Korean surgeons with high eyelid case volumes understand the range of natural Asian eyelid anatomy and aim to create a result that reads as 'naturally double eyelid' rather than visibly surgical. Looking at a surgeon's before-and-after portfolio with focus on 12-month+ results gives you the most accurate preview of their aesthetic approach. Natural-looking results at 1 month often look different from natural-looking results at 6 months — the crease settles and softens significantly over the first 3–6 months.
Sources
- Korean Society of Plastic and Reconstructive Surgeons (대한성형외과학회, Daehan Seonghyeong Oegwa Haghoe). Board certification requirements and legal practice standards. KSPRS official website. [ksprs-registry-training-requirements; ksprs-registry-legal-requirement] https://www.plasticsurgery.or.kr/