Eye Diseases > Eyelids

Marcus Gunn Jaw-Winking Syndrome

Evidence-based assessment and management of synkinetic eyelid movement. Comprehensive guide covering etiology, pathogenesis, classification, diagnosis, and treatment protocols for optometry practice.

Clinical Illustration

Marcus Gunn Jaw-Winking Syndrome: unilateral ptosis at rest with paradoxical lid elevation during jaw opening, lateral excursion, mastication, or jaw protrusion (trigemino-oculomotor synkinesis)

Overview

Marcus Gunn Jaw-Winking Syndrome (MGJWS), also known as Marcus Gunn phenomenon or trigemino-oculomotor synkinesis, is a rare congenital neurogenic ptosis characterised by synkinetic movement of the affected upper eyelid during jaw movements. The hallmark feature is an involuntary rapid elevation of a ptotic eyelid when the jaw is opened, moved laterally, thrust forward, or during chewing, sucking, or swallowing. This paradoxical eyelid movement arises from aberrant neural connections between the motor division of the trigeminal nerve (CN V) and the oculomotor nerve (CN III) innervating the levator palpebrae superioris muscle.

First described by Robert Marcus Gunn in 1883, the condition accounts for approximately 2–13% of all congenital ptosis cases. It typically presents unilaterally and is noticed in infancy when feeding elicits the characteristic winking phenomenon. Although cosmetic and functional concerns vary, early diagnosis is essential — particularly when visual development is threatened by deprivation or occlusion amblyopia during the critical period.

Etiology

Congenital Neural Misdirection

The exact aetiology remains unclear, but the condition is believed to result from aberrant innervation during embryological development. Abnormal connections form between branches of the trigeminal nerve (particularly the motor root to the pterygoid muscles) and fibres of the oculomotor nerve destined for the levator palpebrae superioris, creating the synkinetic movement pattern.

Genetic Factors

Sporadic occurrence: Most cases arise sporadically without family history
Familial cases: Rare autosomal dominant inheritance has been reported
No specific gene identified: Genetic basis remains poorly understood

Associated Conditions

Usually an isolated finding without systemic associations
Rarely associated with other congenital anomalies (cleft palate, Duane syndrome)
Not associated with systemic neurological disorders in typical cases

Pathogenesis

The pathogenesis involves aberrant neural connections established during embryonic development:

Neural Pathway Abnormality

Primary defect: Congenital ptosis due to dysgenesis or weakness of levator palpebrae superioris
Aberrant connections: Abnormal innervation between trigeminal motor fibres (V3) and the superior division of the oculomotor nerve (III)
Synkinetic stimulation: Jaw movements activate both pterygoid muscles (normal) and levator muscle (abnormal), causing paradoxical lid elevation

Most Common Trigger Movements

Lateral pterygoid activation: Moving jaw to the contralateral side (most common trigger)
Jaw opening: Activation during mouth opening
Jaw protrusion: Thrusting jaw forward
Mastication: Chewing movements
Sucking / swallowing: Particularly noticeable in infants during feeding

Theories of Neural Misdirection

Aberrant regeneration theory: Misdirected regrowth during development (less likely as condition is congenital)
Primary misdevelopment: Incorrect axonal guidance during embryogenesis (more widely accepted)
Central mis-wiring: Abnormal central connections in brainstem nuclei

Classification

By Severity of Ptosis

Mild: MRD1 2–3 mm below normal
Moderate: MRD1 3–4 mm below normal
Severe: MRD1 >4 mm below normal; may occlude visual axis

By Clinical Presentation

Lateral pterygoid type (most common): Lid elevates with jaw opening or lateral jaw movement
Medial pterygoid type: Lid elevates with jaw closure or clenching
Rare variants: Lid elevation with tongue protrusion, smiling, or swallowing

By Functional Impact

Non-occlusive: Ptosis does not cover visual axis; primarily a cosmetic concern
Occlusive: Ptosis occludes pupil; risk of deprivation amblyopia in children
Visually significant: Superior visual field defect affecting daily function

Risk Factors

Marcus Gunn Jaw-Winking Syndrome is a congenital condition; traditional modifiable risk factors are absent. However, certain associations have been identified:

Congenital Factors

No known prenatal risk factors: Cause is developmental, not environmental
Sex: Near-equal sex distribution; no consistent sex bias established
Laterality: Left eye more commonly affected than right

Genetic Factors (Rare)

Family history: Rare autosomal dominant cases reported
Consanguinity: May increase risk in rare familial cases

Risk for Complications

Age at presentation: Younger children with severe ptosis are at higher risk for amblyopia
Degree of ptosis: Severe ptosis covering the visual axis increases amblyopia risk substantially
Bilateral cases (very rare): Higher impact on binocular vision development

Clinical Signs

Pathognomonic Sign

Jaw-winking phenomenon: Rapid, involuntary elevation of the ptotic eyelid during jaw movements (opening, lateral excursion, protrusion, chewing)
Synkinetic movement: Lid elevation synchronised with specific jaw muscle activation

Eyelid Findings

Unilateral ptosis (at rest): Variable degree; mild to severe
Reduced or absent lid crease: Due to levator muscle dysfunction
Decreased levator function: Typically <8 mm excursion
Good to normal Bell's phenomenon: Usually preserved
Paradoxical lid retraction: During jaw movement lid may elevate above the normal position

Compensatory Features

Chin-up head posture: To clear the visual axis in moderate-to-severe ptosis
Frontalis over-action: Brow elevation on the affected side to assist lid elevation
Increased blinking: May be present

Associated Ocular Findings

Amblyopia: In severe cases with visual axis occlusion (especially if undiagnosed in infancy)
Strabismus: May coexist (vertical or horizontal deviations)
Superior visual field defect: If ptosis is significant
Anisometropia: May develop secondary to visual deprivation

Symptoms

Many patients or caregivers report the following:

Primary Complaint (Caregiver-Reported in Infants/Children)

"Winking" during feeding: Eyelid elevates when infant sucks or chews
Asymmetric eyelid appearance: One eyelid appears lower than the other at rest
Eye "jumps" with jaw movement: Noticeable lid elevation during eating or jaw activity

Visual Symptoms (if Moderate-Severe)

Obscured superior vision: Droopy lid blocks upper field of view
Head tilting: Child adopts chin-up posture to see better under the drooping lid
Visual fatigue: Straining to see through a partially occluded pupil
Difficulty with upgaze activities: Reading, watching TV, participating in sports

Cosmetic and Psychosocial Concerns

Cosmetic asymmetry: Droopy eyelid and paradoxical movements noticeable to others
Social embarrassment: Older children and adults may be self-conscious during social eating or speaking
Attention from peers: Other children may notice and comment on the phenomenon

Functional Limitations

Eyelid heaviness: Feeling of weight or tiredness in the affected eyelid
Difficulty keeping eye open: Especially when fatigued
No pain: Condition is typically painless

Complications

Amblyopia (Most Serious)

Deprivation amblyopia: If severe ptosis covers the visual axis during the critical period of visual development (birth to age 7–9 years)
Irreversible if untreated: Early surgical intervention is critical in severe cases
Risk factors: Severe ptosis covering the pupil, young age (especially <3 years), delayed diagnosis

Refractive and Binocular Vision Abnormalities

Anisometropia: Unequal refractive error between eyes due to visual deprivation
Astigmatism: Mechanical pressure from the ptotic lid on the cornea
Strabismus: Secondary to amblyopia or underlying oculomotor dysfunction
Abnormal head posture: Compensatory chin-up position leading to neck and back strain

Surgical Complications

Lagophthalmos: Incomplete lid closure post-surgery if overcorrected
Exposure keratopathy: Corneal dryness and damage from poor lid closure
Lid retraction: Excessive elevation of the lid
Residual or recurrent ptosis: Undercorrection or tissue changes over time
Asymmetry: Cosmetic asymmetry between eyelids
Loss of jaw-winking: While a surgical goal, families should be counselled that levator disinsertion removes voluntary blink drive

Psychosocial Impact

Self-consciousness: Particularly in older children and adults during social eating
Bullying or teasing: Children may be subject to peer attention
Body image concerns: Cosmetic asymmetry affecting self-esteem

Systemic Relations and Associations

Marcus Gunn Jaw-Winking Syndrome is typically an isolated congenital anomaly without systemic disease associations. Rare associations have been reported:

Usually Isolated

No systemic disease: Majority of cases occur in otherwise healthy children
No neurological deficits: Central nervous system is typically normal
Normal development: Motor and cognitive milestones are unaffected

Rare Reported Associations

Duane retraction syndrome: Rare co-occurrence
Other cranial nerve synkinesis patterns: Very rare
Craniofacial anomalies: Cleft palate, hemifacial microsomia (case reports)
Blepharophimosis syndrome: Rare overlap

Clinical Implication

Limited systemic workup needed: Diagnosis is clinical; no imaging or labs required in typical cases
Neuroimaging not routine: Only if atypical features, bilateral presentation, or acquired ptosis is suspected
Ophthalmology focus: Management centres on vision preservation and cosmesis

Diagnosis

Diagnosis is primarily clinical, based on observation of the pathognomonic jaw-winking phenomenon. A thorough examination is essential to assess visual impact and plan management.

Clinical History

Age at onset: Congenital; typically noticed in infancy during feeding
Family history: Usually negative; rare familial cases exist
Birth history: Usually unremarkable; no birth trauma association
Jaw-winking observation: Parent/caregiver reports lid elevation with chewing, sucking, or jaw movements
Visual symptoms: Assess for functional visual impairment and abnormal head posture

Physical Examination

Elicit jaw-winking: Ask patient to open mouth, move jaw side-to-side, chew, and protrude jaw — observe for synkinetic lid elevation
Ptosis assessment: MRD1 (normal ~4–5 mm), palpebral fissure height comparison, levator function (typically <8 mm)
Lid crease assessment: Often poorly defined or absent on the affected side
Bell's phenomenon: Check for adequate ocular protection on attempted closure
Frontalis over-action: Observe brow position and muscle activity

Visual Assessment

Visual acuity: Age-appropriate testing; assess for amblyopia
Refractive error: Cycloplegic refraction to detect anisometropia
Ocular alignment: Cover test and alternate cover test to rule out strabismus
Visual field testing: Confrontation or formal perimetry to assess superior field defect
Binocular function: Stereopsis testing

Imaging and Ancillary Tests (if Indicated)

MRI brain (brainstem protocol): To exclude space-occupying lesion or CN III anomaly when atypical features are present (bilateral, acquired onset, associated neurological signs)
Hess chart: To document any associated extraocular muscle defect
Standardised video documentation: Record jaw-winking with all jaw movements — opening, lateral left and right excursion, and jaw thrust
Slit lamp examination: Assess cornea for exposure changes if lagophthalmos is present

Combined Severity Grading

Severity	Ptosis (MRD1)	Jaw-Wink Amplitude	Surgical Approach
Mild	MRD1 >2 mm	<2 mm uplift	Observe or unilateral levator resection
Moderate	MRD1 1–2 mm	2–5 mm uplift	Levator disinsertion + bilateral frontalis sling
Severe	MRD1 ≤1 mm	>5 mm uplift	Bilateral levator disinsertion + bilateral frontalis sling

Diagnostic Criteria Summary: Congenital unilateral ptosis + pathognomonic synkinetic eyelid elevation with jaw movements (opening, lateral excursion, mastication) = Marcus Gunn Jaw-Winking Syndrome.

Management

Singapore Optometry Scope Note: Optometrists can identify, document, and monitor Marcus Gunn Jaw-Winking Syndrome. All cases require ophthalmology or paediatric ophthalmology referral for definitive management planning. Children with ptosis covering the visual axis require urgent referral to prevent amblyopia. Surgical correction is beyond the scope of optometric practice.

Management Approach (Ophthalmology-Led)

Treatment decisions depend on severity of ptosis, degree of jaw-winking, age of patient, and presence of amblyopia or visual impairment.

Conservative Management (Non-Surgical)

Observation

Indications: Mild ptosis not affecting vision or cosmesis; no amblyopia risk

Regular monitoring for visual development
Annual comprehensive eye examinations
Parent education regarding signs of visual impairment

Amblyopia Treatment (if Present)

Optical correction: Glasses for refractive error, particularly anisometropia
Patching therapy: Occlusion of the sound eye if amblyopia is detected
Pharmacological penalisation: Atropine drops in sound eye (alternative to patching)
Early intervention critical: Amblyopia treatment most effective before age 7–9 years

Ptosis Crutches (Temporary)

Spectacle-mounted lid crutch: Mechanical device to support the lid
Limited role: May be used as a temporising measure in infants awaiting surgery
Not definitive treatment: Does not address jaw-winking or underlying pathology

Surgical Management (Ophthalmology/Oculoplastics Referral Required)

Indications for Surgery

Severe ptosis occluding visual axis: Risk of amblyopia (urgent in children)
Moderate-severe jaw-winking: Cosmetically or functionally bothersome synkinesis
Superior visual field compromise: Functional impairment in daily activities
Patient/family request: Cosmetic concerns in older children and adults

Timing of Surgery

Severe ptosis (visual axis occlusion): Early surgery (6 months to 2 years) to prevent amblyopia
Mild-moderate ptosis: Delayed surgery (age 3–5 years or later) for better cooperation and assessment
Cosmetic concerns only: Often wait until child is old enough to participate in the decision (age 5+ years)

Surgical Options

1. Unilateral Levator Resection (Mild-Moderate Ptosis, Minimal Jaw-Winking)

Standard ptosis repair; shortens levator muscle to elevate lid
Does not eliminate jaw-winking (synkinesis may persist or increase)
Suitable when ptosis is the primary concern and jaw-winking is mild

2. Levator Excision + Frontalis Suspension (Moderate-Severe Jaw-Winking)

Step 1: Excision/disinsertion of the levator palpebrae to abolish aberrant innervation
Step 2: Frontalis sling procedure to suspend lid to frontalis muscle for elevation
Advantage: Eliminates jaw-winking by disconnecting the aberrant pathway
Disadvantage: Loss of spontaneous blinking, risk of lagophthalmos, requires brow elevation for lid movement

3. Bilateral Surgery (Hering's Law Consideration)

If levator excision is performed on the affected side, the contralateral lid may become ptotic (Hering's law)
May require bilateral frontalis suspension for a symmetric result
Careful surgical planning and family counselling is essential

Post-Operative Care and Monitoring (Ophthalmology)

Lubrication: Aggressive tear supplementation to protect the cornea if lagophthalmos is present
Taping at night: May be necessary initially if incomplete closure occurs
Monitor for exposure keratopathy: Frequent follow-up in the early post-operative period
Amblyopia surveillance: Continue management if applicable
Revision surgery: May be needed for under- or over-correction

Role of Optometrist

Early detection: Recognise jaw-winking phenomenon during paediatric eye examinations
Documentation: Measure and record ptosis severity, levator function, and MRD1
Amblyopia screening: Age-appropriate visual acuity and binocular vision assessment
Refractive management: Prescribe glasses for refractive error
Urgent referral: Promptly refer children with visual axis occlusion to paediatric ophthalmology
Routine referral: Refer all diagnosed cases to ophthalmology for surgical consultation and management planning
Co-management: Monitor visual development and amblyopia treatment in collaboration with the ophthalmologist
Family education: Explain the condition, natural history, and importance of follow-up

Management Selection Guide

Clinical Scenario	Priority Action	Surgical Consideration
Severe ptosis, infant	Urgent ophthalmology referral	Early frontalis sling
Ptosis + amblyopia	Patch + refer urgently	Surgery after amblyopia stabilised
Mild ptosis, no amblyopia	Refractive correction, review	Observe or levator resection
Significant jaw-winking (cosmetically/functionally bothersome)	Refer to oculoplastics	Levator excision + bilateral frontalis sling
Older child, cosmetic concern only	Elective referral when ready	Patient-directed timing

URGENT REFERRAL CRITERIA

Ptosis occluding the visual axis in a child under 3 years
Confirmed or suspected deprivation amblyopia
Associated neurological features (acquired presentation, bilateral involvement)

Prognosis

Visual Prognosis

Excellent if managed early: With timely intervention, amblyopia can be prevented or successfully treated
Mild-moderate ptosis: Generally excellent visual outcome with or without surgery
Severe ptosis with delayed treatment: Risk of irreversible amblyopia if visual axis is occluded during the critical period (birth to age 7–9)
Post-surgical outcomes: Most patients achieve good functional vision with appropriate correction and amblyopia treatment

Functional and Cosmetic Prognosis

Non-progressive condition: Ptosis and jaw-winking do not worsen over time
Jaw-winking may become less noticeable: Some families report the phenomenon becoming less prominent with age or behavioural adaptation
Surgical correction: Can significantly improve cosmesis and eliminate jaw-winking if levator excision is performed
Functional improvement: Surgery improves the superior visual field and reduces compensatory head posture

Surgical Outcomes

Levator resection alone: Good cosmetic result; jaw-winking may persist or increase post-operatively
Levator excision + frontalis suspension: Eliminates jaw-winking; may result in lagophthalmos requiring long-term lubrication
Revision surgery: May be needed in 10–30% of cases for under- or over-correction
Symmetry challenges: Achieving bilateral symmetry can be difficult, especially when bilateral surgery is required

Long-Term Outlook

Quality of life: With appropriate management, most patients have an excellent quality of life
Psychosocial impact: Surgical correction can significantly improve self-esteem and reduce social embarrassment
No systemic complications: Condition is confined to the eyelid; no long-term systemic health consequences
Lifelong follow-up: Patients may need ongoing eye care for refractive changes, dry eye post-surgery, or revision procedures

Overall Prognosis: Excellent for vision and function with early detection and appropriate management. Cosmetic outcomes are generally favourable with surgical intervention when indicated. The key to optimal outcomes is prevention or early treatment of amblyopia in children with visual axis occlusion.

Differential Diagnosis

The characteristic jaw-winking makes Marcus Gunn syndrome readily distinguishable from other causes of ptosis. However, consider the following conditions:

Simple Congenital Ptosis

Presentation: Unilateral or bilateral ptosis present from birth
Key difference: No jaw-winking or synkinetic movements
Mechanism: Isolated levator muscle dysgenesis
Distinction: Absence of jaw-winking phenomenon on examination

Blepharophimosis-Ptosis-Epicanthus Inversus Syndrome (BPES)

Presentation: Bilateral ptosis with narrow palpebral fissures, telecanthus, epicanthus inversus
Key difference: Bilateral with characteristic facial features; no jaw-winking
Inheritance: Autosomal dominant (FOXL2 gene mutation)
Distinction: Distinctive craniofacial phenotype

Congenital Horner Syndrome

Presentation: Mild ptosis, miosis (small pupil), anhidrosis, iris heterochromia (if congenital)
Key difference: Pupillary findings; no jaw-winking; ptosis is mild (1–2 mm)
Mechanism: Sympathetic pathway disruption (Müller's muscle denervation)
Distinction: Pharmacological testing (apraclonidine or cocaine drops) confirms diagnosis

Third Nerve Palsy (Congenital or Acquired)

Presentation: Ptosis with large non-reactive pupil; eye deviated "down and out"; limited ocular motility
Key difference: Associated ocular motility deficits and pupil involvement
Distinction: Neurological workup and imaging if acquired; no jaw-winking

Myasthenia Gravis (Paediatric or Juvenile)

Presentation: Variable, fatigable ptosis; worsens with sustained upgaze or late in the day
Key difference: Acquired, not congenital; fluctuating nature; no jaw-winking
Mechanism: Autoimmune neuromuscular junction disorder
Distinction: Ice-pack test, acetylcholine receptor antibody testing, electromyography

Marin Amat Syndrome (Inverse Marcus Gunn)

Presentation: Lid closure (not elevation) with jaw opening — opposite pattern to MGJWS
Mechanism: Acquired post-facial nerve palsy with aberrant regeneration
Key difference: History of facial nerve injury; synkinesis is lid closure; not congenital

Mechanical Ptosis

Presentation: Ptosis due to a lid mass (haemangioma, neurofibroma, dermoid cyst)
Key difference: Palpable lid lesion; no jaw-winking
Distinction: Physical examination reveals the underlying mass

Differential Comparison Table

Condition	Jaw-Winking	Onset	Key Feature
MGJWS	Yes (pathognomonic)	Congenital	Lid elevation with jaw movement
Simple congenital ptosis	No	Congenital	Isolated levator dysgenesis
Horner syndrome	No	Variable	Miosis + mild ptosis
Myasthenia gravis	No	Acquired	Fatigable, fluctuating ptosis
Marin Amat syndrome	Inverse (lid closure)	Acquired	Post-facial palsy synkinesis

Diagnostic Key: The presence of synkinetic eyelid elevation with jaw movements is pathognomonic for Marcus Gunn Jaw-Winking Syndrome and readily distinguishes it from all other causes of congenital ptosis. If jaw-winking is absent, consider other differential diagnoses.

Clinical Pearls

Jaw-winking is pathognomonic — no other condition causes ipsilateral lid elevation with jaw movement. Always test all pterygoid actions: mouth opening, lateral left excursion, lateral right excursion, and jaw thrust to identify the triggering movement.

The lateral pterygoid muscle (CN V3) is most commonly involved. Its activation during jaw opening and lateral excursion produces the characteristic winking — explaining why the phenomenon is most obvious during eating or speaking.

Amblyopia management is the clinical priority — not cosmesis. Patching therapy for the fellow eye must begin as early as possible in children under 8 years of age. Surgical timing should not delay amblyopia treatment.

Müllerectomy alone is insufficient for severe ptosis. When MRD1 is ≤1 mm, levator disinsertion and bilateral frontalis sling are required for symmetry. Warn parents that levator disinsertion renders the eye unable to close fully — requiring long-term lubrication.

Inform parents the jaw-winking may persist after ptosis correction, particularly after levator resection alone. Full disinsertion significantly reduces but may not completely eliminate the synkinesis.

Hering's law matters for surgical planning. When unilateral levator excision is performed, the fellow lid may become ptotic due to the bilateral innervation drive being disrupted. Bilateral surgery may be required for a symmetric cosmetic result.

Singapore Optometry Scope Note: Refer to paediatric ophthalmologist for amblyopia assessment and management — this is time-critical in children under 8 years. Document MRD1 in primary gaze and with all jaw movements. Video documentation is strongly recommended. MRI referral is appropriate if associated neurological features are present.

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