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Related Experiment Video

Updated: May 10, 2025

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System
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Visual Acuity Among Portuguese School-Aged Population.

María Ibeth Peñaloza-Barbosa1, Clara Martinez-Perez2, Cristina Andreu-Vázquez3

  • 1School for Doctoral Studies and Research, Universidad Europea de Madrid, 28670 Madrid, Spain.

Journal of Clinical Medicine
|April 26, 2025
PubMed
Summary

This study established visual acuity (VA) norms for Portuguese children aged 6-17, finding 86.8% had normal vision. It provides crucial data for early detection of vision impairments in school-aged populations.

Keywords:
amblyopiachildrenearly detectionrefractive errors

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Area of Science:

  • Ophthalmology
  • Pediatric Optometry
  • Public Health

Background:

  • Visual acuity (VA) screening is essential for identifying visual impairments in school-aged children.
  • Previous research highlights the validity of VA screening in this demographic.
  • There is a need for localized, age-specific VA data for effective screening protocols.

Purpose of the Study:

  • To establish comprehensive, age-specific visual acuity (VA) normative reference values for school-aged children (6-17 years) in Lisbon, Portugal.
  • To estimate the prevalence of abnormal VA (defined as VA < 0.8 in the worst eye) within this urban population.
  • To provide data supporting the development of tailored vision-screening programs for children.

Main Methods:

  • An observational, descriptive, and cross-sectional study was conducted.
  • 2215 healthy children aged 6-17 years from three educational centers in Lisbon participated.
  • Monocular and binocular VA were assessed using the Herman Snellen optotype, with retinoscopy performed.

Main Results:

  • The study established VA ranges for different age groups, with overall normal VA (≥0.8) found in 86.8% of children.
  • Prevalence of VA deficits: mild (10.5%), moderate (1.1%), and severe (1.6%).
  • Age-specific percentiles for monocular and binocular VA were calculated for the cohort.

Conclusions:

  • The study provides essential age-specific visual acuity normative data for Portuguese children.
  • Prevalence estimates of visual acuity deficits offer critical insights for public health initiatives.
  • Findings support the implementation of age-adjusted vision-screening protocols for early detection of visual impairments.