OcuLearning › Lens

Pediatric Cataract

URGENT — Lens

Symptoms

  • leukocoria (white pupil): often noticed by parents or on screening
  • poor visual attention: inability to track light or toys
  • strabismus (eye turn) or nystagmus (shaking eyes)
  • asymptomatic: mild opacities may only be found on routine red reflex exam

Clinical Findings

Critical surgical timing

  • dense unilateral cataract: remove by 4–6 weeks of age (amblyopia emergency)
  • dense bilateral cataracts: remove by 8–10 weeks of age
  • delay leads to irreversible deprivation amblyopia and sensory nystagmus

Systemic associations

  • galactosemia: classic "oil-droplet" lens; reversible with early diet change
  • torch (rubella): "pearly" nuclear cataract and "salt-and-pepper" retinopathy
  • lowe syndrome: cataract, congenital glaucoma, and renal fanconi (males)

Ocular features

  • persistent fetal vasculature (pfv): usually unilateral; elongated ciliary processes
  • aphakic glaucoma: risk in 20–30% after infant surgery; requires lifelong monitoring
  • rapd: a cataract alone does NOT cause a pupillary defect; implies nerve/retina pathology

Etiology

Idiopathic & genetic

  • most common cause is idiopathic; familial cases are usually autosomal dominant

Metabolic/syndromic

  • galactosemia, trisomy 21, lowe syndrome, and alport syndrome

Morphology

  • zonular (lamellar): most common; "onion skin" appearance with clear/white layers
  • anterior polar: small, usually stable, but can cause refractive amblyopia
  • posterior lenticonus: progressive posterior protrusion and opacification

Acquired

  • trauma, steroid use, chronic uveitis, or radiation

Red Flags

  • leukocoria: always exclude retinoblastoma before assuming it is "just" a cataract
  • nystagmus: a late sign indicating the fovea has never received a clear image
  • unilateral microphthalmos: suggests pfv or intrauterine infection
  • rapid progression: can turn a partial cataract into a dense amblyogenic one quickly

Investigations

Clinical screen

  • brückner test: assess for asymmetric or absent red reflex
  • retinoscopy: a blunted or absent reflex confirms a visually significant cataract

Imaging

  • b-scan ultrasound: mandatory if the fundus is obscured to rule out retinoblastoma/pfv

Laboratory (bilateral cases)

  • rbc galt activity: screen for galactosemia (mandatory if not yet explained)
  • urine amino acids: screen for lowe or alport syndrome
  • torch titers: screen for congenital infections (rubella, cmv, etc.)

Treatment

Surgical

  • lensectomy with anterior vitrectomy: to prevent posterior capsule opacification
  • infant aphakia treatment study (iats): contact lenses are preferred over iols in <7 months

Medical/visual

  • pupillary dilation: temporizing measure for small central cataracts
  • aggressive amblyopia therapy: patching of the better eye is crucial post-operatively
  • aphakic correction: high-power contact lenses or glasses

Clinical Pearl

the visual outcome of a pediatric cataract depends on how quickly you operate — unilateral dense cataract is an amblyopia emergency and should be removed within weeks of detection, not months.

Differential Diagnosis

  • • retinoblastoma (the "must-not-miss" cause of leukocoria)
  • • persistent fetal vasculature (pfv)
  • • retinopathy of prematurity (rop) with vitreous haze
  • • coats disease

Related Lens Conditions