Congenital & Developmental Glaucoma

Primary Congenital Glaucoma

The classic triad, epiphora (tearing), photophobia, and blepharospasm, all trace back to corneal edema and stretching under elevated IOP in an infant eye. The infant sclera and cornea are still elastic. Instead of resisting the raised pressure the way an adult globe would, they stretch, producing buphthalmos ("ox eye"), a globe visibly enlarged beyond normal. A horizontal corneal diameter greater than 12 mm (normal newborn diameter runs about 10 to 10.5 mm) is itself suspicious for the diagnosis. The same stretching can rupture Descemet's membrane, producing horizontal or curvilinear breaks called Haab's striae.

The underlying defect is trabeculodysgenesis: maldevelopment of the trabecular meshwork and anterior chamber angle that obstructs aqueous outflow. When the cornea is clear enough to allow it, the first-line treatment is surgical rather than medical: goniotomy, incising the abnormal meshwork under direct gonioscopic visualization. CYP1B1 mutations are the most frequently identified cause of autosomal recessive primary congenital glaucoma. Timing also matters for classification: onset within the first month of life is termed "newborn onset" and tends to run a more severe, treatment-resistant course than later-onset disease.

Left untreated, primary congenital glaucoma causes optic nerve damage, corneal scarring, and amblyopia, and it remains a leading cause of preventable childhood blindness worldwide. That is exactly why early recognition of the triad matters clinically. Simple nasolacrimal duct obstruction also causes tearing, but it never touches the cornea: corneal enlargement and clouding with photophobia are what separate true congenital glaucoma from NLDO at the bedside.

Syndromic & Genetic Associations

A handful of developmental syndromes carry glaucoma as a recognized complication, each with its own distinctive exam finding:

• Axenfeld-Rieger syndrome: a prominent, anteriorly displaced Schwalbe's line, called posterior embryotoxon, visible at the corneal periphery on slit-lamp exam.
• Peters anomaly: a central corneal opacity (leukoma) with adhesions between the iris and posterior cornea, from failure of normal anterior segment cleavage.
• Aniridia: caused by PAX6 mutations, with progressive angle closure leading to secondary glaucoma alongside foveal hypoplasia and cataract.
• Sturge-Weber syndrome: glaucoma presenting later in childhood is most often caused by elevated episcleral venous pressure from anomalous episcleral vascular development, impairing aqueous outflow.

Juvenile open-angle glaucoma (onset ages 3 to 35) is a distinct entity, most strongly associated with MYOC (myocilin) mutations. It is autosomal dominant, produces markedly elevated IOP, and unlike true congenital glaucoma, the angle itself is normally developed and open rather than dysgenetic.