How Ptosis Correction Works
눈꺼풀 하수 교정 (nunkkeopul hasu gyojeong, eyelid ptosis correction) addresses a low upper lid margin caused by weakness or stretching of the levator palpebrae superioris — the primary muscle responsible for lifting the upper eyelid. The condition ranges from a barely perceptible asymmetry to a lid that covers the pupil significantly enough to restrict the upper visual field.
The diagnosis begins with measuring the margin-to-reflex distance 1 (MRD1): the distance in millimetres from the centre of the pupil’s light reflex to the upper lid margin, measured with the patient in primary gaze. A normal MRD1 is 3.5–4.5mm. An MRD1 below 2mm indicates significant ptosis; readings between 2–3mm occupy a moderate clinical zone where functional impairment depends on individual anatomy and brow compensation.
Brow compensation is an important variable. Patients with long-standing ptosis unconsciously recruit the frontalis muscle — the forehead muscle — to raise the brow and partially lift the drooping lid. This produces the characteristic wide-eyed, raised-brow facial expression seen in chronic ptosis patients. Surgeons assess brow position by having patients relax the forehead actively, which often reveals more severe ptosis than the resting appearance suggests.
The most common surgical correction is levator advancement (also called levator aponeurosis repair): the surgeon opens the eyelid crease, identifies the levator aponeurosis — the flat tendon-like tissue that transmits the levator muscle’s pull to the lid margin — and either reattaches or shortens it to raise the lid margin to the target height. The procedure is almost always performed under local anaesthesia with sedation, which allows the surgeon to ask the patient to open their eyes mid-procedure and assess lid height symmetry in real time.
This intraoperative adjustment is a material advantage of local anaesthesia for ptosis correction. Because every millimetre of lid height matters to the cosmetic and functional outcome, the ability to verify height while the patient is awake reduces the rate of asymmetry and overcorrection compared to procedures performed under general anaesthesia, where the lid position cannot be assessed during surgery.
Plastic surgery and dermatology collectively account for the largest share of procedures sought by international patients in Korea.¹ Ptosis correction — whether standalone or combined with double eyelid surgery — forms a significant portion of eyelid-related consultations in the Gangnam district, which receives approximately 60% of medical tourists seeking aesthetic procedures.¹
Technique Comparison by Ptosis Type and Severity
Four techniques cover the large majority of ptosis cases seen in Korean clinics. The choice depends on levator muscle function (measured by how far the lid travels from full downgaze to full upgaze — normal is 15mm or more), the underlying cause, and whether double eyelid creation is planned simultaneously.
Levator advancement is the dominant technique in Korean practice for adult acquired ptosis — the form most foreign patients present with — because levator function is typically preserved even when the aponeurosis has stretched or detached with age. Müller’s muscle resection suits only a narrow clinical window: mild ptosis where the phenylephrine drop test (a 10% phenylephrine drop instilled in the eye temporarily stimulates Müller’s muscle) raises the lid to the desired height, predicting that surgical resection of that muscle alone will achieve the target without touching the levator.
Frontalis suspension is less frequently performed in general aesthetic clinics and more commonly managed by surgeons with oculoplastic or craniofacial training because it requires an understanding of expected lagophthalmos management and the graft or implant material used. As of 2024, approximately 2,100 board-certified plastic surgeons are registered with the Korean Society of Plastic and Reconstructive Surgeons (KSPRS; 대한성형외과학회, Daehan Seonghyeong Oegwa Haghoe) in Korea.² Patients should verify their surgeon’s certification directly on the KSPRS public registry before proceeding.²
Candidacy: Cosmetic vs Medical Ptosis Correction
The distinction between cosmetic and medical ptosis is not merely administrative — it determines the surgical approach, the anaesthesia plan, and whether any Korean National Health Insurance reimbursement pathway exists.
Cosmetic ptosis correction addresses a lid margin that is lower than the patient prefers, where the MRD1 is borderline (2–3mm) and visual field testing shows no functional impairment. Medical ptosis correction addresses a documented reduction in superior visual field caused by lid margin encroachment of 3mm or more onto the pupil, confirmed by Humphrey or Goldmann visual field perimetry. The functional threshold for NHI consideration requires ophthalmologist documentation — self-reported symptoms are insufficient for insurance purposes.
Often a good candidate
- Visibly drooping upper lid affecting appearance, vision, or both — confirmed by MRD1 measurement below the normal 3.5–4.5mm range
- Asymmetric eyelid height from congenital or acquired ptosis, where the height difference is measurable and stable
- Patients seeking combined double eyelid creation and ptosis correction in one procedure — the levator advancement required for ptosis naturally forms the double eyelid crease through the same incision
- Patients with good levator function (≥8mm excursion) who are appropriate for the standard anterior levator advancement approach
- Non-smoking patients in good systemic health, able to sit partially upright during a procedure under local anaesthesia with sedation
Should reconsider or wait
- Dry eye syndrome (keratoconjunctivitis sicca) — raising the lid margin increases corneal exposure surface; patients with baseline dry eye must be assessed by an ophthalmologist pre-operatively and may require more conservative lid height targets
- Bell's palsy or other facial nerve disorders affecting orbicularis oculi function — if the eyelid cannot close fully pre-operatively, ptosis correction will worsen exposure risk
- Thyroid eye disease (Graves' ophthalmopathy) — lid position is unstable during active thyroid disease; surgery requires documented thyroid function stability for a minimum of 6 months before a safe surgical plan can be established
- Prior eyelid or orbital surgery — scarring alters tissue planes and complicates levator identification; revision cases require a surgeon experienced in secondary eyelid procedures
Not a suitable candidate
- Patients who cannot tolerate sedation or local anaesthesia for documented medical reasons — general anaesthesia removes the intraoperative adjustment that is central to achieving symmetric lid height
- Patients with unrealistic expectations that correcting one drooping lid in a unilateral case will not affect the fellow eye — Hering's law of equal innervation means correcting one lid can unmask a contralateral droop that was previously compensated; this must be discussed before surgery, not after
Foreign patients visiting Korea on tourist visas are not enrolled in Korean National Health Insurance and are not eligible for NHI reimbursement regardless of medical severity.¹ Korean expats with active NHI coverage should obtain ophthalmologist visual field documentation before their surgical consultation so the surgeon can assess the insurance pathway from the first appointment.
Results and Longevity
The primary outcome measure for ptosis correction is symmetric MRD1 — both lids resting at 3.5–4.5mm in primary gaze with the brow relaxed. Secondary outcomes include eyelid crease height symmetry (where double eyelid creation is performed simultaneously), smoothness of the lid contour arc, and absence of lagophthalmos on downgaze.
Levator advancement for acquired aponeurotic ptosis carries a high rate of satisfactory initial correction. The critical variable is long-term durability. Because the aponeurosis stretched or detached once, there is a non-zero recurrence rate over years — ptosis can gradually return as the repair site loosens with time or further age-related tissue changes. Patients should understand that ptosis correction is durable but not necessarily permanent; a proportion of patients will require a secondary adjustment procedure over a 10–20 year horizon.
Symmetry is the outcome patients notice first and the one most sensitive to surgical technique. Because levator function, resting tone, and tissue elasticity differ between the two eyelids even in a healthy person, achieving identical MRD1 measurements bilaterally is the goal, but a tolerance of 0.5–1mm between lids is clinically acceptable and often not perceptible in normal social interaction.
Where ptosis correction is performed alongside double eyelid surgery, the eyelid crease definition continues to mature for up to six months as scar tissue softens and the crease adhesion stabilises. Patients assessing their result before this point should expect further change.
Pricing for combined ptosis correction and double eyelid surgery in Korea typically ranges from ₩2.5–6M (≈USD 1,850–4,400; ≈AUD 2,850–6,800), depending on whether the procedure is incisional or non-incisional and whether revision is included. Standalone ptosis correction without double eyelid runs ₩1.5–3.5M (≈USD 1,100–2,600; ≈AUD 1,700–4,000). FX rates: USD/KRW 1,355, AUD/KRW 870, as of July 2026.
Recovery Timeline
Procedure performed under local anaesthesia with sedation. Duration is typically 60–90 minutes for combined ptosis and double eyelid; 45–60 minutes for standalone ptosis correction. Patient is discharged the same day. Cold compress is applied immediately. Mild blurred vision from ointment is normal. A responsible adult must accompany the patient home.
Peak swelling and bruising. Eyelids appear significantly more swollen than the intended final result — this is expected and does not reflect the outcome. Suture care with saline or prescribed solution twice daily. Sleeping with head elevated reduces fluid accumulation. Avoid bending at the waist or lifting. Prescribed antibiotic eye drops or ointment used as directed.
Non-absorbable sutures are typically removed at 5–7 days post-surgery. Swelling remains visible but bruising begins to yellow and fade. Most patients can wear glasses at this stage. Contact lenses remain prohibited — usually until day 14 minimum. Indoor activity is comfortable; outdoor sun exposure should be minimised and SPF applied around (not directly on) the incision line.
Most patients are comfortable in public without heavy concealment at this point. Residual swelling is present but mild. Eyelid height may still appear slightly higher than the final resting position as swelling resolves — this is normal and typically settles downward over the following weeks. Light makeup on the lids can begin once the incision is fully closed and confirmed by the surgeon.
Swelling substantially resolved. Lid position at this point is a reasonable indicator of the final result but not definitive — subtle changes continue. Any significant asymmetry or lagophthalmos (incomplete eye closure) that persists beyond 4 weeks should be reviewed by the operating surgeon. Strenuous exercise can typically resume at 3–4 weeks.
The incision scar continues to soften and fade. The double eyelid crease — where created simultaneously — reaches its mature definition. Lid height symmetry is assessed at the 3-month appointment. Any persistent overcorrection or undercorrection that warrants surgical adjustment is typically addressed at 3–6 months, after tissue remodelling has stabilised enough to make revision technically reliable.
Foreign patients planning travel to Korea for ptosis correction should schedule a minimum of 14 days in-country to cover the surgery date, suture removal at day 5–7, and a post-removal review before departure. A follow-up video consultation at one month is standard practice at clinics accustomed to international patients.