Pediatric Cataract

Pediatric Cataract Basics - Cloudy Peepers Primer

• Lens opacity in children; key cause of treatable childhood blindness.
• Types: Congenital (at birth or <1 yr), infantile, developmental, traumatic.
• Etiology:
  • Genetic (most common)
  • Metabolic (e.g., galactosemia)
  • Intrauterine infections (TORCH)
  • Trauma, Idiopathic
• Signs: Leukocoria (white pupil), strabismus, nystagmus, poor fixation.

  ⭐ Leukocoria is the most common presenting sign of pediatric cataract.

• Early diagnosis & intervention crucial to prevent amblyopia.

Etiology & Classification - Cataract Culprits Lineup

• Etiology:
  • Idiopathic/Sporadic: Most common (approx. 50%).
  • Hereditary: Autosomal Dominant (AD, most common inherited), Autosomal Recessive (AR), X-linked. Genes: CRY, GJA.
  • Maternal Infections (TORCH): Rubella (Gregg's triad), Cytomegalovirus (CMV), Toxoplasmosis.
  • Metabolic: Galactosemia (oil-droplet, reversible), Lowe syndrome, Hypoglycemia.
  • Trauma: Penetrating, blunt.
  • Drugs: Corticosteroids (prolonged use).
  • Radiation.
  • Syndromic: Down syndrome, Stickler syndrome, Marfan syndrome.
• Morphological Classification:
  • Lamellar/Zonular: Most common congenital type; opacities around embryonic nucleus.
  • Polar: Anterior or Posterior (PPC often with Mittendorf's dot).
  • Nuclear: Central opacity, early onset.
  • Cortical: Peripheral, spoke-like opacities.
  • Sutural: Along Y-sutures, often visually insignificant.
  • Total/Mature or Membranous.
  • Blue-dot (Cataracta Punctata Caerulea).

⭐ Galactosemia can cause an "oil-droplet" cataract, which may be reversible with early dietary restriction of galactose.

Clinical Features & Diagnosis - Little Eyes, Big Clues

• Presentation:
  • Leukocoria (white pupil) - most common sign.
  • Absent red reflex.
  • Poor fixation, nystagmus (esp. bilateral, dense, early onset).
  • Strabismus.
  • Photophobia.
  • Family history.
• Diagnostic Evaluation:
  • Red Reflex Test (Bruckner): Crucial screening.
    • Dim room, direct ophthalmoscope from 1 meter.
  • Slit-lamp examination: Morphology (e.g., lamellar, polar, nuclear).
  • Ophthalmoscopy.
  • B-scan USG: If posterior view obscured.
  • Systemic workup: TORCH screen, metabolic tests (e.g., for galactosemia - "oil droplet" cataract).

⭐ Leukocoria is the most common presenting sign of pediatric cataract and warrants urgent ophthalmological evaluation to prevent amblyopia.

Management Strategies - Clearing the View Path

• Surgical Timing (Critical Period):
  • Unilateral dense: 4-6 weeks of birth.
  • Bilateral dense: 6-8 weeks of birth.
  • Partial/later onset: Individualized, based on visual significance.
• Surgical Technique:
  • Lensectomy & Aspiration.
  • Primary Posterior Capsulotomy (PPC).
  • Anterior Vitrectomy (AV).
  • Intraocular Lens (IOL) Implantation:
    • Primary IOL: Typically >1 year (or >6 months). Consider deferring in neonates.
    • Aphakia: If IOL deferred.
• Post-operative Management:
  • Optical Correction: Aphakic glasses, contact lenses (esp. unilateral), IOL.
  • Amblyopia Therapy: Crucial; patching, atropine penalization.
  • Regular follow-up: Refraction, IOP monitoring.

⭐ The most common cause of poor visual outcome after pediatric cataract surgery is amblyopia, emphasizing the need for aggressive post-op therapy.

Complications & Prognosis - Post-Op Peeks & Outlook

• Post-Op: Uveitis, Posterior Capsular Opacification (PCO) (very common), Visual Axis Opacification (VAO).
• Long-Term: Amblyopia, strabismus, secondary glaucoma.

⭐ Secondary glaucoma: most common vision-threatening complication.

• Prognosis: Early surgery (<6 wks bilateral; <4-6 wks unilateral) & rigorous amblyopia therapy are key for better visual outcomes. Unilateral often poorer_._

High‑Yield Points - ⚡ Biggest Takeaways

• Leukocoria (white reflex) is the most common presentation.
• Key causes: TORCH infections (e.g., Rubella), galactosemia, trauma.
• Critical surgery: unilateral by 6 weeks, bilateral by 8 weeks to prevent amblyopia.
• Unilateral cataracts pose a higher amblyopia risk than bilateral.
• Oil-drop reflex on retroillumination suggests galactosemic cataract.
• Posterior lenticonus is a common cause of progressive unilateral cataract.
• Lifelong aphakic correction and amblyopia therapy are essential post-surgery.