≥12 mm (Good)
- Classification
- Mild ptosis (1–2 mm) + positive phenylephrine
- Surgical Procedure
- Müller's muscle–conjunctival resection (MMCR)
- Approach
- Posterior
Ptosis
Oculoplasty
Key Points
- •Levator function is THE most important measurement in ptosis surgery planning — it determines the surgical approach (good = advancement/MMCR, fair = resection, poor = frontalis sling)
- •Aponeurotic ptosis has a high/absent skin crease with good levator function — pathognomonic of levator aponeurosis dehiscence
- •Always perform the curtain test in unilateral ptosis to unmask bilateral ptosis due to Hering's law — prevents unexpected contralateral ptosis post-operatively
- •Congenital ptosis covering the pupil is an emergency — risk of deprivation amblyopia; urgent frontalis sling required
- •Autogenous fascia lata is the gold standard sling material for frontalis sling — minimum patient age 3 years / height >100 cm
Ptosis (blepharoptosis) is an abnormally low position of the upper eyelid margin in primary gaze, resulting in narrowing of the palpebral fissure. The normal upper lid margin rests 1–2 mm below the superior limbus (MRD1 ≥ 4 mm); ptosis is present when MRD1 is <2 mm or when inter-lid asymmetry exceeds 2 mm.
Aponeurotic (involutional) ptosis is the most common form in adults, increasing in prevalence with age — affecting approximately 11.5% of individuals over 50 years.
Congenital ptosis occurs in approximately 1 in 800–1,000 live births, with a slight male predominance.
Bilateral cases account for ~5% of simple congenital ptosis; ~95% are unilateral with left-side predominance (68–74% of unilateral cases).
Myogenic ptosis from myasthenia gravis has a prevalence of 15–20 per 100,000 population.
Myogenic: congenital myogenic ptosis (dysgenesis of levator palpebrae superioris — fibrofatty replacement), myasthenia gravis, chronic progressive external ophthalmoplegia (CPEO), myotonic dystrophy, oculopharyngeal dystrophy.
Aponeurotic: involutional stretching/dehiscence of levator aponeurosis, post-surgical (especially after cataract surgery — reported in 5–10% post-phaco), post-traumatic, contact lens–induced.
Neurogenic: CN III palsy (complete/partial), Horner syndrome, Marcus Gunn jaw-winking synkinesis, multiple sclerosis.
Mechanical: lid mass (chalazion, tumour, dermoid), cicatricial scarring (trachoma, pemphigoid), brow ptosis mimicking true ptosis.
Traumatic: direct levator laceration or aponeurotic disinsertion.
Normal eyelid elevation is achieved primarily by the levator palpebrae superioris (CN III, ~15 mm excursion) with accessory support from Müller's muscle (sympathetic, ~2 mm excursion).
In congenital myogenic ptosis, the levator muscle undergoes fibrofatty infiltration during embryonic development, leading to poor contraction and paradoxically poor relaxation (lid lag in downgaze).
In aponeurotic ptosis, the levator aponeurosis stretches, thins, or dehisces from its tarsal insertion, causing the lid to drop despite preserved levator function (good excursion).
In neurogenic ptosis, disrupted neural input to the levator (CN III) or Müller's muscle (sympathetic — Horner) leads to reduced contraction.
Mechanical ptosis results from the weight of a mass or cicatricial shortening of lid tissues overcoming the lifting force of the levator.
By Etiology:
- Myogenic (congenital, acquired muscular dystrophies)
- Aponeurotic (involutional, post-surgical, traumatic)
- Neurogenic (CN III palsy, Horner syndrome, Marcus Gunn)
- Mechanical (tumours, scarring, dermatochalasis)
- Traumatic
By Severity (based on MRD1):
- Mild: MRD1 2–4 mm (1–2 mm ptosis)
- Moderate: MRD1 0–2 mm (3 mm ptosis)
- Severe: MRD1 ≤0 mm (≥4 mm ptosis)
By Levator Function:
- Good: ≥12 mm
- Fair: 5–11 mm
- Poor: ≤4 mm
- Advanced age (involutional aponeurotic ptosis).
- Prior ocular surgery, especially cataract surgery (aponeurotic disinsertion — reported in 5–10% post-phaco).
- Long-term rigid contact lens wear.
- Chronic eye rubbing.
- Family history (congenital ptosis — occasionally autosomal dominant).
- Systemic diseases: myasthenia gravis, CPEO, Horner syndrome aetiology (Pancoast tumour, carotid dissection).
- Trauma to the upper lid or orbit.
- Floppy eyelid syndrome (associated with obstructive sleep apnoea).
Symptoms: drooping of upper eyelid, superiorly restricted visual field, chin-up head posture (especially in children), frontalis overaction causing brow ache, cosmetic concern, asthenopia.
Signs — General:
- Narrowed palpebral fissure
- Elevated skin crease (aponeurotic) or absent skin crease (congenital myogenic)
- Frontalis overaction with brow elevation
- Chin-up head posture
Congenital myogenic ptosis specific:
- Lid lag on downgaze (due to fibrotic levator — poor relaxation)
- Poor levator function
- May have ipsilateral superior rectus weakness (common origin)
Aponeurotic ptosis specific:
- High or absent skin crease (pathognomonic)
- Good levator function despite significant droop
- Thin, redundant upper lid
Horner syndrome specific:
- Mild ptosis (1–2 mm) + reverse ptosis (lower lid elevation)
- Miosis, facial anhidrosis
- Dilation lag with cocaine/apraclonidine test
CN III palsy specific:
- Severe ptosis with restricted eye movements
- ± Pupil involvement (rule out posterior communicating artery aneurysm)
Clinical Measurements (Essential):
- MRD1 (Margin Reflex Distance 1): distance from corneal light reflex to upper lid margin (normal ≥4 mm)
- MRD2: distance from light reflex to lower lid margin
- Levator function (Berke method): lid excursion from extreme downgaze to extreme upgaze with frontalis blocked (normal ≥12 mm)
- Palpebral fissure height (normal 9–12 mm)
- Skin crease height (normal 8–10 mm in Caucasians, 5–7 mm in Asians)
Special Tests:
- Phenylephrine test (2.5%): instil in superior fornix — positive if lid elevates ≥2 mm (predicts MMCR success)
- Ice test (for myasthenia): apply ice pack 2 min — improvement ≥2 mm suggests myasthenia
- Fatigue test: sustained upgaze for 1–2 min — progressive ptosis suggests myasthenia
- Cogan lid twitch sign: brief overshoot of lid on refixation from downgaze
Laboratory (if myasthenia suspected):
- Anti-AChR antibodies (positive in ~85% generalised MG)
- Anti-MuSK antibodies (if AChR negative)
- CT chest (thymoma screening)
- Repetitive nerve stimulation / single-fiber EMG
Imaging:
- MRI brain/orbit: for CN III palsy (rule out aneurysm, tumour)
- CT/MRA: for Horner syndrome workup (carotid dissection, Pancoast tumour)
- Photography: document pre-operative appearance
Dermatochalasis: excess skin overhanging lid margin — pseudoptosis; skin crease and levator function normal, corrected by blepharoplasty.
Brow ptosis: brow descent mimics ptosis; palpebral fissure normalises when brow is manually elevated.
Microphthalmos / phthisis bulbi / enophthalmos: smaller globe or sunken globe creates apparent ptosis; check globe size/position.
Contralateral lid retraction: apparent ptosis on normal side due to Hering's law (bilateral assessment mandatory — curtain test).
Hypotropia: apparent ptosis due to downdrifted eye; cover test reveals vertical deviation.
Blepharospasm: involuntary orbicularis contraction mimics ptosis; look for bilateral spasm, Charcot sign.
Untreated ptosis:
- Deprivation amblyopia (congenital severe ptosis — most critical complication)
- Superior visual field loss
- Compensatory chin-up posture causing cervical strain
- Cosmetic and psychosocial impact
Post-surgical complications:
- Undercorrection (most common, ~5–15%) — may need revision
- Overcorrection (lid too high) — early massage/observation; may need surgical lowering
- Lagophthalmos and exposure keratopathy
- Asymmetry (Hering's law effect — contralateral lid may drop after unilateral repair)
- Loss of skin crease / contour abnormality
- Corneal abrasion (suture-related)
- Infection / haematoma (rare)
Non-surgical:
- Observation if mild and asymptomatic
- Ptosis crutch on spectacles (for poor surgical candidates)
- Treat underlying cause: pyridostigmine 60 mg TDS for myasthenia gravis; thymectomy if thymoma
Surgical — based on levator function:
Good levator function (≥12 mm):
- Müller's muscle–conjunctival resection (MMCR): for mild ptosis (1–2 mm) with positive phenylephrine test — posterior approach, resect 4 mm Müller + conjunctiva per mm correction
- Levator aponeurosis advancement/reinsertion: gold standard for aponeurotic ptosis — anterior approach, identify and advance aponeurosis to tarsal plate
Fair levator function (5–11 mm):
- Levator resection (large): anterior approach, resect levator muscle — amount based on Berke nomogram (e.g., 3 mm ptosis with fair function → resect 20–22 mm)
Poor levator function (≤4 mm):
- Frontalis sling: connect lid to frontalis muscle using sling material — autogenous fascia lata (gold standard, minimum age 3 years / height >100 cm) or silicone rod (Crawford/Fox pentagon), mersilene mesh, or expanded PTFE
Congenital ptosis with amblyopia risk:
- Early surgery (within weeks–months) if pupil occluded — frontalis sling preferred
- Clear visual axis is the priority — amblyopia treatment simultaneously
Aponeurotic ptosis repair has excellent outcomes: >90% satisfactory lid height at 1 year; revision rate 5–15%.
Congenital ptosis repair outcomes depend on levator function; frontalis sling provides functional but cosmetically imperfect results — revision rate 10–20%.
Marcus Gunn jaw-winking: surgery complex (levator excision + bilateral frontalis sling); results often suboptimal.
Myasthenic ptosis: medical management effective in majority; surgery reserved for stable disease (≥6 months).
Amblyopia outcomes in congenital ptosis: good if corrected before age 6–8 with early patching therapy.
Recurrence rates vary: aponeurotic 5–10%, congenital 15–25%, frontalis sling 10–30% (higher with non-autogenous materials).
Clinical Pearls
1
Always check levator function before deciding surgical approach — it is THE most important measurement in ptosis surgery planning.
2
In unilateral ptosis, always perform the curtain test (manually elevate ptotic lid and observe contralateral lid) to unmask bilateral ptosis due to Hering's law — failure to recognise this leads to post-operative contralateral ptosis.
3
A high or absent skin crease with good levator function is pathognomonic of aponeurotic ptosis — look for it in every post-cataract surgery patient.
4
Any child with ptosis covering the visual axis is an emergency — amblyopia develops rapidly; urgent frontalis sling is indicated.
5
The phenylephrine test predicts MMCR success: if the lid elevates ≥2 mm with 2.5% phenylephrine drops, MMCR is likely to give a good result.
6
Lid lag on downgaze is a key sign of congenital myogenic ptosis — the fibrotic levator cannot relax properly, unlike aponeurotic ptosis where the lid descends normally in downgaze.
7
Marcus Gunn jaw-winking ptosis shows retraction of the ptotic lid with jaw movement (chewing, lateral excursion) — due to synkinesis between CN V motor division and CN III (levator). Treatment is complex: levator excision + bilateral frontalis sling.
8
Exam trap — Levator function determines surgery: Good levator function (≥12 mm): Levator aponeurosis advancement/MMCR (most common surgery for involutional ptosis). Fair levator function (5–11 mm): Levator resection (larger resection). Poor levator function (≤4 mm): Frontalis sling (brow suspension with silicone rod/fascia lata) — the levator is too weak to be used.
9
Exam trap — Myasthenia masquerading as ptosis: Myasthenia can mimic any form of ptosis (unilateral, bilateral, variable). Always check: Cogan's lid twitch (brief upshoot of lid on return from downgaze to primary), fatigue on sustained upgaze (2 minutes), and ice test (ptosis improves after 2 min ice application, 80% sensitivity). If any doubt — request anti-AChR antibodies and tensilon test.
10
Exam trap — Marcus Gunn jaw-winking ptosis: Synkinesis between the pterygoid branch of CN5 (trigeminal) and the levator palpebrae (CN3). The ptotic lid elevates with jaw movement (chewing, opening mouth, moving jaw to opposite side). Important to demonstrate this before surgery — standard levator surgery alone may not be sufficient; consider bilateral levator excision + frontalis suspension.
Oral-exam questions
- What is the most important measurement in ptosis surgery planning? — Levator function (Berke method) — determines the surgical approach: good (≥12 mm) = advancement/MMCR; fair (5–11 mm) = large resection; poor (≤4 mm) = frontalis sling.
- What is the curtain test and why is it important? — Manually elevate the ptotic lid and observe the contralateral lid. If it drops (Hering's law), there is bilateral ptosis — failing to recognise this leads to unexpected contralateral ptosis after unilateral surgery.
- What is pathognomonic of aponeurotic ptosis on examination? — A high or absent skin crease with good levator function — indicates the aponeurosis has dehisced from the tarsus but the levator muscle itself is intact.
- What does lid lag on downgaze indicate? — Congenital myogenic ptosis — the levator muscle has undergone fibrofatty replacement and cannot relax properly. This is not seen in aponeurotic ptosis.
- What is the gold standard sling material for frontalis sling? — Autogenous fascia lata — harvested from the thigh. Minimum patient age 3 years / height >100 cm. Silicone rod is used in younger children as a temporary measure.
- When is ptosis surgery urgent? — In congenital ptosis where the lid covers the pupillary axis — risk of deprivation amblyopia. Surgery (frontalis sling) should be performed within weeks to months of diagnosis.
- What is the phenylephrine test and what does it predict? — Instil 2.5% phenylephrine in the superior fornix. If the lid elevates ≥2 mm, it predicts that MMCR (Müller's muscle–conjunctival resection) will achieve a good surgical result — because Müller's muscle is responsive.
- Why is the phenylephrine test important in ptosis assessment? — Instilling phenylephrine 2.5% drops in the ptotic eye stimulates Müller's muscle (sympathetically innervated). If the ptosis corrects by ≥2mm, the patient is a good candidate for Müller's muscle-conjunctival resection (MMCR) — a posterior approach surgery. If phenylephrine shows minimal improvement, proceed with anterior approach levator surgery. This test predicts surgical outcome.
Mnemonics
PTOSIS causes
P — Post-surgical (aponeurotic — commonest acquired)
T — Third nerve (CN III) palsy
O — Old age (involutional aponeurotic)
S — Sympathetic (Horner syndrome — mild ptosis)
I — Infant (congenital myogenic)
S — Systemic (myasthenia gravis, CPEO)
Levator Function guides Surgery
G — Good (≥12 mm) → Advancement / MMCR
F — Fair (5–11 mm) → Full (large) levator resection
P — Poor (≤4 mm) → Pull from frontalis (frontalis sling)
Comparison Tables
Surgical Approach Based on Levator Function
| Levator Function | Classification | Surgical Procedure | Approach |
|---|---|---|---|
| ≥12 mm (Good) | Mild ptosis (1–2 mm) + positive phenylephrine | Müller's muscle–conjunctival resection (MMCR) | Posterior |
| ≥12 mm (Good) | Aponeurotic ptosis (any degree) | Levator aponeurosis advancement | Anterior (gold standard) |
| 5–11 mm (Fair) | Moderate ptosis | Large levator resection (Berke nomogram) | Anterior |
| ≤4 mm (Poor) | Severe ptosis (congenital/myogenic) | Frontalis sling | Anterior (fascia lata or silicone rod) |
≥12 mm (Good)
- Classification
- Aponeurotic ptosis (any degree)
- Surgical Procedure
- Levator aponeurosis advancement
- Approach
- Anterior (gold standard)
5–11 mm (Fair)
- Classification
- Moderate ptosis
- Surgical Procedure
- Large levator resection (Berke nomogram)
- Approach
- Anterior
≤4 mm (Poor)
- Classification
- Severe ptosis (congenital/myogenic)
- Surgical Procedure
- Frontalis sling
- Approach
- Anterior (fascia lata or silicone rod)
Types of Ptosis — Clinical Differentiators
| Feature | Congenital Myogenic | Aponeurotic | Neurogenic (CN III) | Horner |
|---|---|---|---|---|
| Onset | Birth | Gradual (elderly) | Acute/subacute | Acute or gradual |
| Severity | Variable | Variable (usually mild–moderate) | Severe | Mild (1–2 mm) |
| Levator function | Poor (fibrotic) | Good (preserved) | Poor (denervated) | Normal (Müller only) |
| Skin crease | Absent/poorly formed | High or absent | Normal | Normal |
| Lid lag on downgaze | YES (fibrotic levator) | No | No | No |
| Associated signs | ± SR weakness | Post-cataract, CL wear | Ophthalmoplegia, ± pupil | Miosis, anhidrosis |
| Key test | Levator function measurement | Phenylephrine test | MRI brain (aneurysm) | Cocaine/apraclonidine test |
Onset
- Congenital Myogenic
- Birth
- Aponeurotic
- Gradual (elderly)
- Neurogenic (CN III)
- Acute/subacute
- Horner
- Acute or gradual
Severity
- Congenital Myogenic
- Variable
- Aponeurotic
- Variable (usually mild–moderate)
- Neurogenic (CN III)
- Severe
- Horner
- Mild (1–2 mm)
Levator function
- Congenital Myogenic
- Poor (fibrotic)
- Aponeurotic
- Good (preserved)
- Neurogenic (CN III)
- Poor (denervated)
- Horner
- Normal (Müller only)
Skin crease
- Congenital Myogenic
- Absent/poorly formed
- Aponeurotic
- High or absent
- Neurogenic (CN III)
- Normal
- Horner
- Normal
Lid lag on downgaze
- Congenital Myogenic
- YES (fibrotic levator)
- Aponeurotic
- No
- Neurogenic (CN III)
- No
- Horner
- No
Associated signs
- Congenital Myogenic
- ± SR weakness
- Aponeurotic
- Post-cataract, CL wear
- Neurogenic (CN III)
- Ophthalmoplegia, ± pupil
- Horner
- Miosis, anhidrosis
Key test
- Congenital Myogenic
- Levator function measurement
- Aponeurotic
- Phenylephrine test
- Neurogenic (CN III)
- MRI brain (aneurysm)
- Horner
- Cocaine/apraclonidine test
Frontalis Sling Materials — Comparison
| Material | Type | Advantages | Disadvantages | Revision Rate |
|---|---|---|---|---|
| Autogenous fascia lata | Autologous | Gold standard; lowest extrusion/infection | Donor site morbidity; min age 3 yrs / height >100 cm | 10–15% |
| Silicone rod (Crawford) | Synthetic | No donor site; adjustable | Higher extrusion/granuloma rate | 20–30% |
| Mersilene mesh | Synthetic | Readily available; good tissue integration | Higher infection risk | 15–25% |
| Expanded PTFE (Gore-Tex) | Synthetic | Flexible; easy to use | Higher infection/extrusion | 20–30% |
| Banked fascia lata | Allograft | No donor site morbidity | Variable quality; possible absorption | 15–25% |
Autogenous fascia lata
- Type
- Autologous
- Advantages
- Gold standard; lowest extrusion/infection
- Disadvantages
- Donor site morbidity; min age 3 yrs / height >100 cm
- Revision Rate
- 10–15%
Silicone rod (Crawford)
- Type
- Synthetic
- Advantages
- No donor site; adjustable
- Disadvantages
- Higher extrusion/granuloma rate
- Revision Rate
- 20–30%
Mersilene mesh
- Type
- Synthetic
- Advantages
- Readily available; good tissue integration
- Disadvantages
- Higher infection risk
- Revision Rate
- 15–25%
Expanded PTFE (Gore-Tex)
- Type
- Synthetic
- Advantages
- Flexible; easy to use
- Disadvantages
- Higher infection/extrusion
- Revision Rate
- 20–30%
Banked fascia lata
- Type
- Allograft
- Advantages
- No donor site morbidity
- Disadvantages
- Variable quality; possible absorption
- Revision Rate
- 15–25%
Self-Assessment (5)
MCQ
A 65-year-old man presents with bilateral ptosis that developed gradually after cataract surgery. Examination shows MRD1 of 1 mm bilaterally, good levator function (14 mm), and a high skin crease. What is the most appropriate surgical procedure?
MCQ
A 2-year-old child presents with severe unilateral ptosis (MRD1 = -2 mm) with levator function of 3 mm. The lid covers the pupil. What is the most urgent concern and appropriate management?
MCQ
What does a positive phenylephrine test (lid elevates ≥2 mm) indicate in ptosis assessment?
MCQ
During pre-operative assessment for unilateral ptosis surgery, manually elevating the ptotic lid causes the contralateral lid to drop. What does this indicate?
MCQ
Which finding on examination is pathognomonic of congenital myogenic ptosis?
References
- AAO Preferred Practice Pattern: Eyelid Malposition — Blepharoptosis (2019)
- Kanski JJ, Bowling B. Clinical Ophthalmology: A Systematic Approach, 9th Edition
- Rootman J. Diseases of the Orbit: A Multidisciplinary Approach, 3rd Edition
- Collin JRO. A Manual of Systematic Eyelid Surgery, 3rd Edition
- Dutton JJ. Atlas of Clinical and Surgical Orbital Anatomy, 2nd Edition
- Ehlers JP, Shah CP. The Wills Eye Manual: Office and Emergency Room Diagnosis and Treatment of Eye Disease, 8th Edition
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