Ophthalmology – Congenital Ptosis

Basics

Description

Congenital ptosis is drooping of the upper eyelid that is present at birth or develops within the first year of life.

The most common form is:

Simple congenital myogenic ptosis due to levator palpebrae superioris dysgenesis

It may be:

• Unilateral
• Bilateral
• Mild to complete
• Isolated or syndromic

The major clinical concern is not cosmetic appearance but preservation of visual development by preventing:

• Amblyopia
• Significant astigmatism
• Anisometropia
• Strabismus
• Visual-axis obstruction
• Persistent abnormal head posture

Pathophysiology

In simple congenital ptosis, the levator muscle is developmentally abnormal.

Normal skeletal muscle fibers are variably replaced by:

• Fibrous tissue
• Adipose tissue

This produces:

• Reduced levator contractility
• Reduced relaxation in downgaze

The result is the classic combination of:

Ptosis in primary gaze + lid lag in downgaze

Epidemiology

Congenital ptosis is uncommon, but exact prevalence varies among populations.

Most cases are:

• Sporadic
• Idiopathic

Familial cases occur.

Genetics

The genetics of isolated congenital ptosis are heterogeneous.

Some familial forms demonstrate:

• Autosomal dominant inheritance
• X-linked inheritance
• Other chromosomal associations

Routine genetic testing is not required for isolated simple congenital ptosis.

Genetic evaluation is more useful when:

• Ptosis is bilateral
• Other congenital anomalies are present
• There is a strong family history
• A defined syndrome is suspected

Blepharophimosis-Ptosis-Epicanthus Inversus Syndrome

BPES is an important syndromic cause of congenital ptosis.

It is associated with pathogenic variants in:

FOXL2

and usually follows an:

Autosomal dominant

inheritance pattern.

BPES Features

The classic findings are:

• Bilateral ptosis
• Blepharophimosis
• Epicanthus inversus
• Telecanthus

Some affected females also develop:

Primary ovarian insufficiency

depending on the BPES subtype.

Other Syndromic Associations

Congenital ptosis may occur with:

• Congenital fibrosis of the extraocular muscles
• Craniofacial syndromes
• Myotonic disorders
• Mitochondrial disease
• Chromosomal syndromes

Systemic evaluation is appropriate when other developmental abnormalities are present.

Clinical Presentation

The eyelid position may range from:

• Subtle asymmetry
• Partial pupillary coverage
• Complete visual-axis obstruction

Parents may notice:

• Drooping eyelid
• Chin-up posture
• Brow elevation
• Forehead wrinkling
• Eye closure asymmetry
• Strabismus

Amblyopia

Amblyopia is one of the most important complications.

It may result from:

• Visual-axis occlusion
• Induced astigmatism
• Anisometropia
• Associated strabismus

An important point:

Refractive error and strabismus are common causes of amblyopia in congenital ptosis, even when the pupil is not completely covered.

Refractive Error

Congenital ptosis may be associated with:

• Astigmatism
• Anisometropia
• Myopia
• Hyperopia

The pressure and altered contour of a ptotic lid may contribute to:

Corneal astigmatism

Therefore all children require:

Cycloplegic refraction

Abnormal Head Posture

Children with bilateral severe ptosis may compensate with:

Chin elevation

This allows them to see beneath the drooping eyelids.

Persistent chin-up posture is itself an indication to consider surgery.

Frontalis Recruitment

Children often compensate by:

• Elevating the eyebrows
• Contracting the frontalis muscle

This may partially mask the severity of ptosis.

The brow should therefore be stabilized during formal measurement.

History

Ask about:

• Present since birth?
• Stable or progressive?
• Unilateral or bilateral?
• Does it fluctuate?
• Worse when tired?
• Jaw movement change the eyelid?
• Abnormal head posture?
• Sleep with the eye partly open?
• Family history?
• Birth trauma?
• Other congenital abnormalities?

Old photographs are useful for documenting:

• Chronicity
• Symmetry
• Head posture
• Variability

Fluctuating Ptosis

True simple congenital ptosis is generally:

Stable rather than fluctuating

Marked variability should raise suspicion for:

• Myasthenia gravis
• Intermittent neurogenic disease
• Mechanical factors

Examination

A complete pediatric ophthalmic examination should assess:

• Visual acuity
• Cycloplegic refraction
• Ocular alignment
• Ocular motility
• Pupils
• Eyelid measurements
• Cornea
• Anterior segment
• Fundus

Margin Reflex Distance 1

MRD1 is the distance from the corneal light reflex to the upper eyelid margin in primary gaze.

It helps quantify:

• Ptosis severity
• Symmetry

A normal MRD1 is generally approximately:

4–5 mm

in adults, though pediatric interpretation should consider age and cooperation.

Palpebral Fissure Height

Measure the vertical distance between:

• Upper lid margin
• Lower lid margin

in primary gaze.

Compare both eyes.

Levator Function

This is the most important surgical measurement.

To measure:

1. Stabilize the brow to eliminate frontalis action.
2. Ask the patient to look from maximum downgaze to maximum upgaze.
3. Measure upper-lid excursion.

Approximate interpretation:

• Good: ≥12 mm
• Fair: 5–11 mm
• Poor: ≤4 mm

Congenital Ptosis Examination Pattern

Classic simple congenital ptosis shows:

• Poor levator function
• Weak or absent lid crease
• Lid lag in downgaze
• Possible lagophthalmos
• Frontalis overaction
• Chin-up posture in severe bilateral cases

Lid Crease

The upper eyelid crease is often:

• Weak
• Poorly formed
• Absent

because the abnormal levator has reduced attachment and function.

This contrasts with aponeurotic ptosis, which often has:

Good levator function with a high lid crease.

Lid Lag in Downgaze

This is a classic congenital ptosis feature.

Because the dysgenic levator does not relax normally, the affected eyelid remains relatively elevated in downgaze.

Thus the ptotic lid may appear:

Higher than expected in downgaze

compared with the normal side.

Bell Phenomenon

Always assess:

Bell phenomenon

before ptosis surgery.

Poor Bell phenomenon increases the risk of:

• Exposure keratopathy
• Corneal ulceration

after postoperative eyelid elevation.

Lagophthalmos

Assess:

• Voluntary closure
• Forced closure
• Sleep-related lagophthalmos when history suggests it

Children with congenital ptosis may already have incomplete closure, and surgery can worsen it.

Corneal Examination

Look for:

• Exposure
• Punctate epithelial erosions
• Scarring
• Reduced tear-film protection

especially when:

• Bell phenomenon is poor
• Lagophthalmos is present

Pupillary Examination

Pupils are essential in distinguishing congenital ptosis from neurogenic causes.

Miosis

Consider:

Horner syndrome

Mydriasis

Consider:

CN III palsy

especially if accompanied by ophthalmoplegia.

Ocular Motility

Assess all ductions and versions.

Motility abnormalities suggest diagnoses other than isolated levator dysgenesis.

Important possibilities include:

• CN III palsy
• Monocular elevation deficiency
• Congenital fibrosis of extraocular muscles
• Marcus Gunn jaw-winking
• Other congenital cranial dysinnervation disorders

Monocular Elevation Deficiency

The older term:

Double elevator palsy

is now more often termed:

Monocular elevation deficiency

The affected eye has limited elevation in:

• Abduction
• Adduction

and may appear ptotic because of:

• True ptosis
• Hypotropia-related pseudoptosis
• Both

Marcus Gunn Jaw-Winking Syndrome

Marcus Gunn jaw-winking is a congenital cranial dysinnervation disorder characterized by:

Elevation or retraction of the ptotic upper lid during jaw movement

Triggers may include:

• Sucking
• Chewing
• Opening the mouth
• Moving the jaw laterally

Marcus Gunn Mechanism

It results from aberrant innervation between:

• Trigeminal motor pathways
• Levator palpebrae superioris

It is usually:

• Unilateral
• Associated with congenital ptosis

Examination for Jaw-Winking

Observe the eyelid while the child:

• Sucks from a bottle
• Chews
• Opens the mouth
• Moves the jaw side to side

This is easily missed if not specifically tested.

Treatment of Jaw-Winking

Mild jaw-winking may simply be observed.

Significant socially or functionally troublesome synkinesis may require:

• Levator weakening/excision
• Frontalis suspension

Surgical strategy is individualized according to:

• Degree of jaw wink
• Ptosis severity
• Symmetry

Horner Syndrome

Congenital Horner syndrome may produce:

• Mild ptosis
• Miosis
• Lower-lid “reverse ptosis”
• Iris heterochromia

The affected iris may appear:

Lighter

when sympathetic disruption occurs early in life.

Congenital Horner Workup

Congenital Horner syndrome requires evaluation based on:

• Timing
• Birth trauma
• Neurologic examination
• Acquired vs clearly congenital onset

If the cause is uncertain, investigation for lesions along the sympathetic pathway may be needed.

Third Nerve Palsy

Congenital or acquired CN III dysfunction may cause:

• Ptosis
• Ophthalmoplegia
• Exotropia/hypotropia
• Possible pupil abnormality

A ptotic child with abnormal motility should not automatically be diagnosed with simple congenital ptosis.

Congenital Fibrosis of the Extraocular Muscles

CFEOM is a congenital cranial dysinnervation disorder characterized by:

• Restrictive ophthalmoplegia
• Abnormal eye position
• Ptosis
• Compensatory head posture

Genetic causes include several genes affecting cranial motor neuron development.

Myasthenia Gravis

Rarely, childhood myasthenia may mimic congenital ptosis.

Features favoring myasthenia include:

• Fluctuating ptosis
• Fatigability
• Variable diplopia
• Orbicularis weakness
• Normal pupils

Testing may include:

• AChR antibodies
• Ice-pack test
• Electrophysiology

Mechanical Ptosis

Always evert and inspect the lid when an atypical mass is suspected.

Potential causes include:

• Dermoid
• Neurofibroma
• Hemangioma
• Chalazion
• Other eyelid/orbital tumors

Imaging may be required if:

• Mass effect
• Proptosis
• Globe displacement

is present.

Pseudoptosis

Apparent congenital ptosis may result from:

• Microphthalmos
• Enophthalmos
• Hypotropia
• Contralateral lid retraction
• Brow asymmetry

These should be distinguished from true levator dysfunction.

Diagnostic Testing

Simple congenital ptosis usually requires:

No laboratory testing or imaging

The diagnosis is clinical.

When Imaging Is Indicated

Consider MRI or CT when there is:

• Abnormal ocular motility
• CN III palsy
• Suspected Horner syndrome
• Orbital mass
• Proptosis
• Rapid progression
• Neurologic abnormalities
• Atypical presentation

MRI is generally preferred when evaluating:

• Brain
• Cranial nerves
• Soft-tissue orbital pathology

Genetic Testing

Consider genetic evaluation when there is suspicion for:

• BPES
• CFEOM
• Syndromic craniofacial disease
• Multiple affected family members

Differential Diagnosis

Important differentials include:

• Simple congenital myogenic ptosis
• Marcus Gunn jaw-winking syndrome
• Horner syndrome
• CN III palsy
• Monocular elevation deficiency
• CFEOM
• Mechanical ptosis
• Birth-trauma-related ptosis
• Myasthenia gravis
• CPEO
• Myotonic dystrophy
• Microphthalmos
• Enophthalmos
• Hypotropia-related pseudoptosis
• BPES

Treatment Principles

The priorities are:

1. Prevent amblyopia
2. Correct refractive error
3. Treat strabismus when indicated
4. Correct significant abnormal head posture
5. Improve eyelid position and symmetry

Cosmesis is important but comes after preservation of visual development.

Refractive Correction

Treat:

• Astigmatism
• Anisometropia
• Hyperopia
• Myopia

with appropriate spectacles or contact lenses.

Cycloplegic refraction should be repeated periodically throughout childhood.

Amblyopia Treatment

Treatment may include:

• Spectacle correction
• Patching
• Atropine penalization in selected children

Amblyopia therapy should begin promptly when indicated and should not be delayed solely until after ptosis surgery.

Observation

Observation is appropriate for mild congenital ptosis when there is:

• Clear visual axis
• No amblyopia
• No significant refractive error
• No strabismus-related concern
• No abnormal head posture

These children still require:

Long-term visual surveillance.

Indications for Early Surgery

Early surgery is indicated when there is:

• Visual-axis obstruction
• Amblyopia or high risk of amblyopia
• Significant induced astigmatism
• Persistent chin-up posture
• Severe bilateral ptosis affecting visual development

In these circumstances:

Do not delay surgery for cosmetic-age considerations.

Timing When Vision Is Not Threatened

If vision develops normally and there is no significant head posture, surgery can often be deferred until approximately:

3–5 years of age

This allows:

• More reliable measurements
• Better tissue size
• Improved postoperative assessment

Timing should be individualized.

Surgical Choice

The operation is determined primarily by:

Levator function

Poor Levator Function

When levator function is approximately:

≤4 mm

the preferred procedure is generally:

Frontalis suspension / frontalis sling

Frontalis Sling

The eyelid is connected to the frontalis muscle so that:

Brow elevation raises the eyelid

This is especially useful for:

• Severe simple congenital ptosis
• Poor levator function
• Selected neuromuscular disorders

Sling Materials

Options include:

• Autologous fascia lata
• Silicone rod
• Other synthetic materials

Autologous fascia lata is durable but may be impractical in very young children because insufficient fascia is available.

Silicone is useful because it is:

• Adjustable
• Reversible
• Commonly used in younger children

Fair or Good Levator Function

If levator function is adequate, options include:

• Levator resection
• Levator advancement

The amount of resection depends on:

• Ptosis severity
• Levator function
• Desired eyelid height

Müller Muscle Procedures

Posterior Müller muscle–conjunctival procedures are less commonly the primary operation for classic severe congenital myogenic ptosis because:

• Levator function is often abnormal

They may be useful in carefully selected mild cases with:

• Good levator function
• Good phenylephrine response

Surgical Goals

Goals are:

• Clear visual axis
• Appropriate lid height
• Good contour
• Acceptable symmetry
• Preservation of corneal protection

Perfect symmetry in:

• Primary gaze
• Upgaze
• Downgaze

is often impossible because the dysgenic levator does not behave normally.

Postoperative Lagophthalmos

Some degree of lagophthalmos is common after congenital ptosis surgery.

This is particularly expected after:

• Frontalis sling
• Large levator resection

The key is whether the cornea remains:

Adequately protected.

Postoperative Lubrication

Management may include:

• Preservative-free tears
• Lubricating ointment
• Nighttime ointment
• Temporary taping in selected cases

especially when lagophthalmos is significant.

Exposure Keratopathy

Risk is greater with:

• Poor Bell phenomenon
• Reduced corneal sensation
• Aggressive correction
• Preexisting dry eye
• Severe bilateral surgery

Monitor carefully for:

• Punctate epitheliopathy
• Persistent epithelial defect
• Corneal ulceration

Hering’s Law

In asymmetric bilateral ptosis, increased central levator drive may elevate the less ptotic eyelid.

After correcting one eyelid:

The fellow eyelid may fall

revealing previously masked bilateral ptosis.

This should be assessed before surgery.

Strabismus

Strabismus is relatively common in congenital ptosis.

Management depends on:

• Visual axis
• Head posture
• Ocular alignment
• Type of motility disorder

In some patients:

Strabismus surgery is performed before ptosis surgery

because changing ocular alignment can alter apparent eyelid position.

Follow-Up

Children require regular follow-up throughout visual development.

Monitor:

• Visual acuity
• Cycloplegic refraction
• Amblyopia
• Ocular alignment
• MRD1
• Levator function
• Chin-up posture
• Corneal exposure
• Recurrence

Frequency

Follow-up is individualized.

Infants and young children at amblyopia risk require:

Closer and more frequent surveillance

than older children with stable mild ptosis.

Recurrence

Ptosis may recur because of:

• Growth
• Sling stretching
• Material degradation
• Progressive tissue changes

Repeat surgery may occasionally be necessary.

Surgical Complications

Potential complications include:

• Undercorrection
• Overcorrection
• Eyelid asymmetry
• Abnormal contour
• Lagophthalmos
• Exposure keratopathy
• Infection
• Granuloma
• Sling extrusion
• Recurrence

Frontalis Sling Infection

Synthetic sling material can rarely cause:

• Infection
• Granuloma
• Extrusion

Management may require:

• Antibiotics
• Drainage
• Partial or complete sling removal

Prognosis

With appropriate surveillance and treatment:

Visual prognosis is generally excellent.

The most important preventable cause of poor vision is:

Amblyopia

rather than the lid abnormality itself.

Ophthalmology Pearls

• Simple congenital ptosis is usually caused by levator dysgenesis with fibrofatty replacement of normal muscle.
• The classic examination is poor levator function + weak lid crease + lid lag in downgaze.
• The major threat is amblyopia, which can arise from visual-axis obstruction, astigmatism, anisometropia, or associated strabismus.
• Every child with congenital ptosis requires cycloplegic refraction and amblyopia surveillance, even if the pupil is not completely covered.
• A chin-up posture suggests functionally significant ptosis and may itself justify surgery.
• Always examine pupils and ocular motility to exclude Horner syndrome, CN III palsy, and congenital cranial dysinnervation disorders.
• Marcus Gunn jaw-winking causes lid elevation with jaw movement and should be specifically tested during chewing or sucking.
• The historical term double elevator palsy is now more commonly called monocular elevation deficiency.
• BPES is associated with FOXL2 and features bilateral ptosis, blepharophimosis, epicanthus inversus, and telecanthus.
• Simple congenital ptosis usually requires no laboratory testing or neuroimaging unless neurologic, motility, orbital, or syndromic findings are present.
• Surgery should be performed early if the visual axis is obstructed, amblyopia risk is high, or a significant chin-up posture is present.
• When visual development is not threatened, surgery can often be deferred until approximately 3–5 years of age.
• Poor levator function (≈4 mm or less) → frontalis sling is the classic surgical principle.
• Fair/good levator function → levator resection or advancement is usually preferred.
• Check Bell phenomenon and corneal exposure risk before surgery.
• Some postoperative lagophthalmos is expected, particularly after frontalis suspension; the critical issue is maintaining corneal protection.
• Congenital ptosis requires follow-up throughout childhood because refractive error, amblyopia, strabismus, and recurrence can evolve over time.