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Related Experiment Video

Updated: Nov 21, 2025

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia
06:19

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

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Amblyopia screening effectiveness at 3-4 years old: a cohort study.

Sandra Guimaraes1,2, Andreia Soares3,2, Cristina Freitas2

  • 1Ophthalmology, Hospital-Escola da Universidade Fernando Pessoa, Gondomar, Porto, Portugal sandraguimaraes.eye@gmail.com.

BMJ Open Ophthalmology
|January 13, 2021
PubMed
Summary

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Early amblyopia screening in 3-4 year olds is highly effective, preventing future cases. For every 48 children screened, one case of amblyopia is prevented, highlighting the importance of this intervention.

Area of Science:

  • Ophthalmology
  • Pediatric Medicine
  • Public Health

Background:

  • Amblyopia, or 'lazy eye,' is a leading cause of preventable vision impairment in children.
  • Early detection and treatment are crucial for effective amblyopia management.
  • Current screening practices and their effectiveness in preschool-aged children require further investigation.

Purpose of the Study:

  • To evaluate the effectiveness of amblyopia screening in a preschool population aged 3-4 years.
  • To determine key epidemiological metrics including prevalence, treatment success, and screening efficiency.
  • To assess the impact of early detection on long-term visual outcomes.

Main Methods:

  • A cohort of 2300 children aged 3-4 years underwent comprehensive ophthalmological examinations.
Keywords:
epidemiologypublic healthvision

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  • Amblyopia was diagnosed, treated, and monitored within the study cohort.
  • Key metrics such as prevalence, absolute risk reduction (ARR), number needed to screen (NNS), and relative risk reduction (RRR) were calculated.

    • Main Results:

    • Amblyopia prevalence ranged from 3.1% to 4.2% based on diagnostic criteria.
    • Screening at ages 3-4 yielded an estimated ARR of 2.09% and an RRR of 87%, preventing future adult amblyopia.
    • The Number Needed to Screen (NNS) was 47.8, with a treatment effectiveness of 88% for new diagnoses.

    Conclusions:

    • Population-based amblyopia screening at ages 3-4 is a highly effective public health strategy.
    • Screening at this age prevents future amblyopia, with one case averted for every 48 children screened.
    • Integrating primary care referrals for high-risk preverbal children with 3-4 year old screening offers a rational approach to amblyopia control.