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Congenital and paediatric cataract

TL;DR — Childhood cataract is rare (prevalence median 1.03 per 10,000 children; congenital cataract median 1.71 per 10,000; incidence 1.8–3.6 per 10,000/year) but competes with the critical period of visual development, so timing dominates management (Sheeladevi 2016, PMID 27518543). The Infant Aphakia Treatment Study is the field's anchor: 114 infants operated at 1–6 months, randomised to primary IOL or aphakia with contact lens. At 10.5 years median treated-eye acuity was 0.89 vs 0.86 logMAR (P = 0.82); 25% achieved ≤0.30 logMAR and 44% were ≥1.00 logMAR, with no difference between arms (Lambert 2020, PMID 32077909). Primary IOL bought no visual advantage and cost a great deal of surgery: intraoperative complications 28% vs 11% (P = 0.031), adverse events 81% vs 56% (P = 0.008), additional intraocular operations 72% vs 16% (P < 0.0001) by 5 years (Plager 2014, PMID 25077835). Glaucoma is the dominant late risk, rising to 22% (95% CI 16–31) and glaucoma-or-suspect to 40% (32–50) by 10 years, unrelated to IOL status (Freedman 2021, PMID 33331850). Adult evidence — on IOL choice, formula accuracy, PCO, or the meaning of "success" — does not transfer here.

Epidemiology and aetiology

Prevalence estimates span 0.32–22.9 per 10,000 children (median 1.03) and congenital cataract 0.63–9.74 per 10,000 (median 1.71) across 20 prevalence and 4 incidence studies from five geographical regions; prevalence was 0.42–2.05 per 10,000 in low-income economies versus 0.63–13.6 in high-income economies, with no difference by laterality or sex (PMID 27518543). The lower figure in low-income economies is best read as ascertainment failure, since that is exactly where childhood cataract blindness is concentrated. Worldwide, 20,000–40,000 children with congenital or childhood cataract are born each year (Bell 2020, PMID 37180497).

Aetiology divides into genetic, syndromic/metabolic, infectious and idiopathic. Approximately 50% of congenital cataract cases have a genetic cause; all three Mendelian modes occur but autosomal dominant transmission is most frequent, and in most bilateral cases a causative variant can be identified — autosomal dominant inheritance in 44% of cases in one clinical series (Pichi 2016, PMID 27043388; Santana 2011, PMID 21779674; PMID 37180497). Around 15% of cases have systemic features, so paediatric input is required, and in some metabolic conditions congenital cataract is the presenting sign of a treatable disorder (PMID 37180497; Cassidy 1999, PMID 10627826).

Gene class Examples of encoded proteins Source
Crystallins α-, β-, γ-crystallin genes — the largest reported group of mutations Taylan Şekeroğlu 2021, PMID 33951899; PMID 27043388
Lens-specific connexins Gap-junction proteins PMID 27043388
Aquaporins Membrane water channels PMID 27043388
Cytoskeletal structural proteins Fibre-cell architecture PMID 21779674
Developmental regulators Eye-development transcription factors; associated ocular malformations PMID 37180497
Sterol synthesis LSS (lanosterol synthase) — homozygous W581R and G588S in two families with extensive congenital cataract Zhao 2015, PMID 26200341
Phosphoinositide kinases PIKFYVE — p.G1943E identified by whole-exome sequencing; haploinsufficiency reproduced lens vacuolation in zebrafish, alleviated by bafilomycin A1 Mei 2022, PMID 35023829

Next-generation sequencing has changed the diagnostic pathway: determining the molecular cause enables individualised genetic counselling and can identify concomitant ocular or systemic disorders (PMID 33951899). Cataract morphology itself carries aetiological and prognostic information and can guide surgical approach (Lenhart 2022, PMID 35307324).

Detection and referral

Red-reflex examination of all neonates, with referral of suspected cases, is the standard screening approach; parents most often present after noticing strabismus or leukocoria (Rajavi 2016, PMID 27621790; Katre 2022, PMID 36381901). The clinical urgency is entirely about timing: if nystagmus has developed, amblyopia is irreversible (Zetterström 2007, PMID 17944624). Delayed recognition is why congenital cataract was described half a century ago as a preventable cause of childhood blindness and why it still is (Rice 1982, PMID 6819024).

Recommended timing from the review literature: surgery before ~6 weeks of age for dense unilateral cataract (subject to neonatal fitness), and for bilateral cases before nystagmus or strabismus appears (<10 weeks), with no more than about one week between fellow eyes (PMID 27621790). The competing consideration is that earlier surgery is itself the strongest risk factor for aphakic glaucoma, so timing is a genuine trade-off rather than a simple "earlier is better" rule (Kuhli-Hattenbach 2020, PMID 32076840).

The Infant Aphakia Treatment Study

IATS randomised 114 infants aged 1–6 months with unilateral congenital cataract at 12 US sites to primary IOL (n = 57) or aphakia corrected with contact lens (n = 57); median age at surgery 1.8 months (Infant Aphakia Treatment Study Group 2010, PMID 20065212).

Outcome IOL Aphakia/contact lens Statistic Source
Grating acuity at 1 year (median logMAR) 0.97 0.80 P = 0.19 Lambert 2010, PMID 20457949
Additional intraocular operations by 1 year 63% 12% P < 0.001 PMID 20457949
Intraoperative complications (5 y) 28% 11% P = 0.031 PMID 25077835
Adverse events (5 y) 81% 56% P = 0.008 PMID 25077835
Additional intraocular surgeries (5 y) 72% 16% P < 0.0001 PMID 25077835
Median treated-eye acuity at 10.5 y (logMAR) 0.89 (IQR 0.33–1.43) 0.86 (IQR 0.30–1.46) P = 0.82 PMID 32077909
Good acuity (≤0.30 logMAR) at 10.5 y 12/57 (22%) 15/57 (27%) overall 27/110 (25%) PMID 32077909
Poor acuity (≥1.00 logMAR) at 10.5 y 25 (44%) 25 (44%) overall 50/110 (44%) PMID 32077909
Strabismus by 10.5 y 45/55 (82%) 45/54 (83%) P = 0.8 Bothun 2022, PMID 35843488

Three secondary findings shape practice. Glaucoma risk in all study eyes rose from 9% (95% CI 5–16) at 1 year to 17% (11–25) at 5 years and 22% (16–31) at 10 years; glaucoma-or-glaucoma-suspect rose from 12% (7–20) to 31% (24–41) to 40% (32–50), with no significant difference between arms, and eyes with glaucoma had longer axial length but relatively preserved retinal nerve fibre layer and similar acuity at 10 years (PMID 33331850). Preoperative anterior chamber depth predicts it: eyes that developed glaucoma had ACD 2.76 ± 0.48 mm versus 3.08 ± 0.38 mm (mean difference 0.32 mm, P = 0.003), and shallower ACD was a strong predictor (OR 5.8, 95% CI 1.8–18.9, P = 0.004) whereas axial length, lens thickness and corneal diameter were not (PMID 41419074). Anterior-segment OCT did not add discriminating information (Beck 2022, PMID 36122874).

Myopic shift in pseudophakic infant eyes is large and variable: 0.35 D/month (95% CI 0.29–0.40) from 1 month post-surgery to age 1.5 years, then 0.97 D/year (0.66–1.28); the mean total refractive change by age 5 was 8.97 D (7.25–10.68) for children operated at 1 month and 7.22 D (5.54–8.91) for those operated at 6 months, giving a mean refractive error of −2.53 D (−4.05 to −1.02) at 5 years (Weakley 2017, PMID 28215452). Achieving emmetropia at age 5 therefore requires immediate postoperative hyperopic targets of about +10.5 D at 4–6 weeks and +8.50 D at 7 weeks–6 months, and even then many children will need further correction (PMID 28215452).

Optical correction is the treatment, not the surgery. Contact-lens adherence was measured prospectively for the first time in IATS and was associated with visual outcome (Cromelin 2018, PMID 29423513); silicone elastomer lenses were used in 74% of treated eyes and rigid gas-permeable in 21%, with a mean 10.9 replacements per child in the first year and keratometric power falling 0.2 ± 0.2 D/month (Russell 2012, PMID 22669008). Patching hours from surgery to the first birthday and between 12 and 48 months were associated with optotype acuity at 4.5 years (Drews-Botsch 2016, PMID 27228110). Aphakia is often not permanent: 22 of 51 (43%, 95% CI 29–58) children randomised to aphakia and with better-than-light-perception vision at 4.5 years had received a secondary IOL by 10.5 years, 59% of them by age 6, and receiving one did not reduce contact-lens wear time (Drews-Botsch 2026, PMID 41962549).

Bilateral disease and older children

Randomised evidence for bilateral congenital cataract is thin. A Cochrane review identified three RCTs (79 participants under 2 years, all conducted in India, follow-up 1–5 years, unmasked); one 60-child trial comparing primary IOL with primary aphakia found little or no difference in acuity at 5 years (pseudophakic mean 0.50 vs aphakic 0.59 logMAR) (Singh 2022, PMID 36107778). A separate 60-infant randomised comparison of primary IOL with press-on spherical lens correction after unilateral infantile cataract removal found greater acuity improvement in the IOL arm but significantly more serious inflammation (P = 0.007), pupillary membrane (20% vs 0%, P = 0.024) and lens reproliferation (33% vs 7%, P = 0.021) (Li 2014, PMID 24930475).

The TAPS registry extends observation to children operated after the IATS age window, at the same 10 sites:

Cohort n Key outcomes Source
Unilateral, 7–24 months 56 children (92% primary IOL), mean follow-up 47.6 months Intraoperative complications 7%; at age 5, acuity ≥20/40 in 11% and ≤20/200 in 44%; adverse events 24%; glaucoma suspect 4%; unplanned intraocular surgery 14% Bothun 2019, PMID 30880109
Bilateral, 7–24 months 40 children (76 eyes), 68% primary IOL Recurrent visual-axis opacification 7.5%, associated only with IOL use (OR 6.10, P = 0.005); glaucoma suspect 2.5%, no glaucoma Bothun 2021, PMID 32679160
Bilateral, 1–7 months 96 children (178 eyes), 24% primary IOL Median better-eye acuity 0.35 logMAR (~20/45) near age 5; ≥20/40 in 29% of better eyes; ≥20/200 in 1% of better eyes and 12% of worse eyes; younger age and corneal diameter <9.5 mm increased glaucoma/suspect risk Bothun 2020, PMID 31987642

The contrast between bilateral and unilateral outcomes is the practical point: with a healthy fellow eye, unilateral cases generally see well overall but the operated eye often does not; bilateral cases achieve better operated-eye results because there is no competing fixation (PMID 35307324). Better outcomes are associated with early presentation, bilateral disease, absence of nystagmus or strabismus, and consistent amblyopia therapy (PMID 35307324; Pfeifer 2023, PMID 37931117).

Surgical technique in children

Paediatric surgery differs structurally from adult surgery. The basic procedure has changed little in recent years; what has changed is the evidence and the device options, with the IATS 5-year results and comparisons of IOL with contact-lens correction shaping management, and OCT clarifying microstructural effects on paediatric eyes after surgery (Lim 2017, PMID 27653605). Anterior and posterior capsulorhexis with anterior vitrectomy is standard in young children to prevent visual axis opacification, which is the commonest complication of paediatric cataract surgery; secondary glaucoma is the most sight-threatening (PMID 17944624; Knebel 2026, PMID 42285159). Technique choice constrains IOL choice and the follow-up schedule, and biometry must anticipate the myopic shift through childhood (PMID 42285159; PMID 28215452). Premium optics are not established: a review of 17 studies of multifocal or toric IOLs in children found favourable refractive outcomes but data insufficient to support routine use (Asif 2023, PMID 36124376). IOL power calculation in these eyes is treated in IOL power calculation — mean absolute prediction error in IATS pseudophakic infants was 1.8 ± 1.3 D, with 41% of eyes within 1 D but 41% beyond 2 D (VanderVeen 2012, PMID 22411658; VanderVeen 2013, PMID 24011524).

Cost

Treatment cost differs substantially between the two strategies, in the opposite direction from surgical burden. Mean treatment cost to age 1 year was $14,752 with primary IOL versus $10,726 with contact lens, with the initial cataract operation about 50% of costs in both groups and contact lenses 15% ($1,600/patient) of the aphakic group's cost (Carrigan 2013, PMID 23047003). The 5-year analysis extended the same comparison (Kruger 2015, PMID 25439604).

Open questions

  • Which infants should receive a primary IOL? IATS showed no visual advantage and a large surgical burden overall (PMID 32077909; PMID 25077835), but the trial was not powered for subgroup identification; no prospective study has tested a prespecified selection rule (for example by corneal diameter, ACD or family capacity for contact-lens care) against the default of aphakia.
  • Can aphakic glaucoma be prevented rather than only predicted? Shallow preoperative ACD predicts glaucoma at 10 years (OR 5.8, 1.8–18.9) (PMID 41419074) and risk keeps rising with follow-up (PMID 33331850), yet no intervention — surgical timing, technique, or IOP surveillance protocol — has been tested for reducing incidence.
  • Where is the true timing optimum? Early surgery protects against amblyopia (PMID 27621790; PMID 17944624) while itself being the strongest risk factor for aphakic glaucoma (PMID 32076840); the trade-off has never been quantified in a design that measures both endpoints against age at surgery.
  • What is the evidence base for bilateral disease? The whole randomised literature is three small unmasked Indian trials totalling 79 children (PMID 36107778); the largest bilateral outcome data are registry-based (PMID 32679160; PMID 31987642).
  • How should refractive targets be individualised? Myopic shift varies enormously between children (PMID 28215452), and prediction error in infant eyes exceeds 2 D in 41% of cases (PMID 22411658); no validated individual-level growth model has been published.

References

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