Juvenile Cataracts (Cataracts in Children)

Why cataracts matter more in children

In adults, a cataract blurs vision that has already developed normally. In infants and young children, the brain is still learning to see. If one or both eyes send a blurred image during this critical period, mainly the first few years and especially the first months, the brain's visual pathways do not develop properly. This is deprivation amblyopia, which can become permanent even after the cataract is removed. Early detection and treatment are therefore essential.

Types

Cataracts can affect one eye (unilateral) or both (bilateral), and can be small and not affect vision, or dense and blocking.

Causes and risk factors

• Inherited (genetic): a large share of bilateral cataracts run in families, often autosomal dominant.
• Infections during pregnancy: rubella, toxoplasmosis, cytomegalovirus, herpes, syphilis, varicella.
• Metabolic disorders: galactosemia, low blood sugar, low calcium, diabetes.
• Chromosomal and genetic syndromes: Down syndrome, Lowe syndrome, Marfan syndrome and others.
• Eye conditions: uveitis (for example with juvenile idiopathic arthritis), persistent fetal vasculature.
• Medicines: long-term corticosteroids (tablets, inhalers, eye drops).
• Trauma and radiation therapy.
• Premature birth.
• Many unilateral cataracts have no identifiable cause.

Symptoms and signs

• white, gray or cloudy pupil (leukocoria)
• absent or asymmetric red reflex in flash photos or at a pediatric exam
• strabismus: an eye turning in or out
• nystagmus: rapid, involuntary eye movements, a sign of significant vision loss in infants
• poor eye contact or not following objects
• sensitivity to light or glare
• in older children: blurred vision, difficulty reading the board, holding things close

A white pupil can also be a sign of retinoblastoma, a rare eye cancer, so it always needs prompt examination.

Diagnosis

• Red reflex test: pediatricians check this at newborn and well-baby visits by shining a light in each eye.
• Pediatric eye exam: an ophthalmologist examines the lens with a slit lamp after dilating the pupils and assesses vision as appropriate for age.
• Ultrasound of the eye if the cataract prevents a view of the retina.
• Further tests for bilateral cataracts: blood and urine tests for infections and metabolic disorders, genetic testing and pediatric review for associated conditions.

Treatment

Small or partial cataracts

If vision is not significantly affected, the child is monitored closely. Dilating eye drops, glasses and patching may help vision develop around a small central cataract.

Surgery

Visually significant cataracts are removed surgically under general anesthesia. Timing matters:

• dense congenital cataracts in one eye are often removed around 4 to 6 weeks of age
• dense cataracts in both eyes usually by 6 to 8 weeks, with the eyes operated a short time apart

During surgery the cloudy lens is removed. Depending on age:

• infants are usually left without a lens implant (aphakia) and use contact lenses or glasses
• older children (typically after age 1 to 2) usually receive an intraocular lens implant

After surgery

• Optical correction: contacts or glasses, often bifocals, are essential.
• Amblyopia treatment: patching the stronger eye for several hours a day, often for years, especially after unilateral cataract surgery.
• Regular follow-up throughout childhood.

Complications

• amblyopia and permanent vision loss
• glaucoma: occurs in a significant proportion of children after early cataract surgery, sometimes years later, so lifelong pressure checks are needed
• clouding behind the implant (visual axis opacification), requiring laser or further surgery
• strabismus
• retinal detachment (uncommon, later in life)

Outlook

Children with bilateral cataracts treated early often achieve useful vision. Outcomes after unilateral cataracts depend greatly on early surgery and consistent patching and contact lens wear. Family commitment to follow-up and treatment has a large effect on the final result.

Frequently asked questions

What are juvenile cataracts?

Juvenile cataracts are cataracts that occur in babies, children or teenagers. They cloud the lens of the eye and can block vision during the years when the brain is learning to see, risking permanent vision loss if not treated promptly.

What causes cataracts in children?

Causes include inherited gene changes, infections during pregnancy such as rubella, metabolic disorders like galactosemia, chromosomal conditions, eye injuries, long-term steroid use, uveitis and radiation. Many cases, especially in one eye, have no identifiable cause.

What are the signs of a cataract in a baby?

Signs include a white or gray pupil, a missing or uneven red reflex in flash photos, eyes that wander or wobble, poor eye contact and not following objects. Any of these should prompt a prompt pediatric eye examination.

Do children need surgery for cataracts?

Not always. Small cataracts that do not affect vision can be monitored. Cataracts that block vision need surgery, ideally early in infancy for congenital cataracts, followed by glasses or contacts and often patching to treat amblyopia.

Can a child see normally after cataract surgery?

Many children achieve good, useful vision, especially when bilateral cataracts are treated early. Results after one-sided cataracts depend on early surgery, wearing contacts or glasses, and consistent patching. Lifelong eye checks are needed to watch for glaucoma.