Pediatric & Congenital Glaucoma

Overview

Pediatric glaucoma is a heterogeneous group of conditions causing elevated intraocular pressure (IOP) and optic nerve damage in infants and children, and remains a major, largely preventable cause of childhood blindness.² It is broadly divided into primary congenital glaucoma (isolated developmental abnormality of the aqueous outflow pathway) and glaucoma associated with other ocular or systemic anomalies, most notably anterior segment dysgenesis (ASD) syndromes.

Epidemiology & Risk Factors

Primary congenital glaucoma (PCG) typically presents in infancy, often bilaterally, though unilateral cases are common (in one surgical series, 13 of 18 children had bilateral disease and 5 had unilateral involvement, with a mean age at diagnosis of 14 months).¹ ASD-associated glaucoma encompasses a heterogeneous group of congenital ocular malformations resulting from disrupted differentiation of neural crest-derived anterior segment tissues, including aniridia, Axenfeld-Rieger anomaly/syndrome, Peters anomaly, and primary aphakia; mutations in key transcriptional and structural genes account for the majority of these cases, with genotype-phenotype correlations helping to explain variability in glaucoma onset and treatment response among subtypes.² Axenfeld-Rieger syndrome specifically is a rare, autosomal dominant disorder (estimated prevalence roughly 1 in 100,000 live births) that can present as an isolated ocular anomaly or with systemic features.³

Pathophysiology

In classic PCG, trabeculodysgenesis — abnormal, incomplete development of the trabecular meshwork and anterior chamber angle — impairs aqueous outflow, currently classified into clinical subtypes based on gonioscopic angle appearance.² In ASD-associated glaucoma, disrupted neural crest cell differentiation during anterior segment development produces structural angle anomalies (iridocorneal adhesions, abnormal iris insertion, incomplete angle cleavage) that similarly obstruct aqueous outflow, with the specific gene defect (e.g., PAX6 in aniridia, PITX2 or FOXC1 in Axenfeld-Rieger) shaping both the ocular phenotype and systemic associations.²³

Clinical Presentation

The classic triad of PCG is epiphora (excessive tearing), photophobia, and blepharospasm, often first noticed by parents. Because the infant sclera and cornea are more distensible than in adults, sustained elevated IOP causes progressive globe enlargement (buphthalmos) and corneal enlargement, sometimes with corneal edema/clouding and breaks in Descemet's membrane (Haab's striae) visible as horizontal or curvilinear lines. In ASD syndromes, additional distinctive findings are present depending on the specific syndrome — for example, iris abnormalities (corectopia, polycoria, iris hypoplasia) and posterior embryotoxon in Axenfeld-Rieger syndrome, often accompanied by systemic features (dental anomalies, umbilical defects, hearing loss, cardiac anomalies).³

Exam Findings

• Corneal diameter enlargement (buphthalmos) — a hallmark sign, since the pediatric eye is more distensible than the adult eye under pressure
• Corneal edema/clouding and Haab's striae (curvilinear Descemet's membrane breaks)
• Elevated IOP on exam (often requiring exam under anesthesia in young children for accurate, reliable measurement)
• Optic disc cupping, which — unlike in adults — can partially reverse with adequate IOP control given ongoing scleral/neural elasticity in infancy
• In ASD syndromes: posterior embryotoxon (prominent, anteriorly displaced Schwalbe's line), iridocorneal adhesions, corectopia, polycoria, iris hypoplasia, depending on the specific syndrome³

Differential Diagnosis

• Congenital nasolacrimal duct obstruction (epiphora without photophobia, corneal enlargement, or elevated IOP — a much more common and benign cause of a tearing infant)
• Megalocornea (large but structurally normal cornea, normal IOP, no glaucomatous optic nerve changes)
• Birth trauma (forceps injury) causing corneal Descemet's membrane breaks that can resemble Haab's striae but are typically vertical/oblique and unilateral, without elevated IOP
• Other anterior segment dysgenesis syndromes (aniridia, Peters anomaly) with distinct associated features
• Metabolic/storage disorders with corneal clouding (e.g., mucopolysaccharidoses)

Management

Diagnosis in a young child requires slit-lamp biomicroscopy, tonometry, gonioscopy, corneal diameter/pachymetry measurement, and optic disc assessment — often performed under examination under anesthesia (EUA) given the difficulty of cooperative exam in infants. Modern diagnostic strategies increasingly integrate anterior segment imaging with next-generation sequencing to improve early detection and prognostic accuracy, particularly for ASD-associated cases.²

Surgery is the primary treatment for PCG, in contrast to adult glaucoma where medical therapy is often first-line: angle surgery (goniotomy or trabeculotomy, including newer approaches like microcatheter-assisted circumferential trabeculotomy) is the mainstay, aiming to directly address the trabeculodysgenesis. In a five-year single-center surgical series, mean preoperative IOP was 32 mmHg, surgery produced significant reductions in both IOP and corneal diameter, optic disc cupping reversed in most cases, and only 2 of 31 eyes required additional glaucoma surgery, with no significant intraoperative complications recorded — supporting favorable outcomes with early, timely surgical intervention.¹ Medical therapy (topical IOP-lowering agents) is used as a temporizing measure before surgery or for eyes not adequately controlled by angle surgery alone. Management of ASD-associated glaucoma requires individualized surgical and medical approaches based on the underlying genetic mechanism and specific angle anatomy.²

Complications

• Amblyopia from corneal clouding, induced astigmatism, or anisometropia, requiring concurrent amblyopia management alongside IOP control
• Permanent corneal scarring or opacity from prolonged corneal edema if diagnosis/treatment is delayed
• Progressive buphthalmos and axial myopia from globe enlargement, with associated risk of retinal detachment later in life
• Need for repeat surgical intervention in a subset of eyes despite initial successful angle surgery
• In ASD syndromes, systemic anomalies (cardiac, dental, hearing, neurological) requiring coordinated multidisciplinary care beyond ophthalmology alone³

Clinical Pearls

• The classic triad — epiphora, photophobia, blepharospasm — in an infant should prompt urgent ophthalmology referral to exclude PCG, not be dismissed as a simple tearing/nasolacrimal duct issue
• Corneal enlargement (buphthalmos) and Haab's striae are relatively specific findings distinguishing PCG from more benign causes of infant tearing
• Unlike adults, optic disc cupping in infants can partially reverse with adequate, timely IOP control — reinforcing the importance of early surgical intervention
• Surgery (goniotomy/trabeculotomy), not medical therapy, is the primary treatment for PCG, with favorable outcomes when performed early¹
• Posterior embryotoxon and iris anomalies (corectopia, polycoria) in an infant should prompt consideration of Axenfeld-Rieger syndrome and screening for associated systemic anomalies³

Common Pitfalls

• Attributing infant tearing/photophobia to simple nasolacrimal duct obstruction without examining for corneal enlargement or elevated IOP
• Delaying ophthalmology referral, missing the window where early surgery produces the best structural and visual outcomes
• Failing to perform exam under anesthesia when office exam is unreliable in an uncooperative infant, risking missed or delayed diagnosis
• Overlooking systemic anomaly screening in a child with ASD-associated glaucoma, missing associated cardiac, dental, or hearing abnormalities
• Assuming medical therapy alone is adequate first-line management for PCG, rather than recognizing surgery as the primary treatment modality