Related Experiment Video
Updated: Jul 18, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
Published on: October 18, 2024
The influence of low birth weight on the prevalence of refractive errors among schoolchildren
Damian Czepita1, Maria Zejmo, Artur Mojsa
1Department of Ophthalmology, Pomeranian Medical University al. Powstańców Wlkp. 72, 70-111 Szczecin.
Insights
Low birth weight may influence refractive errors in schoolchildren. Children born weighing over 2500 grams showed higher rates of hyperopia and lower rates of anisometropia.
Area of Science:
- Ophthalmology
- Pediatric Ophthalmology
- Public Health
Background:
- Refractive errors are common vision impairments in children.
- Birth weight is a potential factor influencing early development, including ocular health.
Purpose of the Study:
- To investigate the association between low birth weight and the prevalence of refractive errors in a large cohort of schoolchildren.
- To determine if birth weight impacts the occurrence of myopia, hyperopia, and anisometropia.
Main Methods:
- A cross-sectional study involving 3663 schoolchildren aged 6-17 years.
- Refractive errors assessed via skiascopy with cycloplegia, reported as spherical equivalent (SE).
- Birth weight data collected via parental questionnaire; statistical analysis using chi-square test.
Main Results:
- Hyperopia was more prevalent in children aged 6-7 years with birth weights > 2500 grams (p < 0.05).
- Anisometropia was less frequent in children aged 10-11 years with birth weights > 2500 grams (p < 0.05).
Conclusions:
- Low birth weight may be associated with the prevalence of refractive errors in schoolchildren.
- Findings suggest a potential link between birth weight and specific refractive error types, warranting further investigation.
Purpose:
The aim of the study was to determine in a large population whether low birth weight has an influence on the prevalence of refractive errors among schoolchildren.
Material And Methods:
3663 schoolchildren were examined (1738 boys and 1925 girls, aged 6-17 years, mean age 11.1, SD = 3.2). The weight at birth was 1500-2500 grams (mean 2184, SD = 271) in 254 and more than 2500 grams (mean 3398, SD = 441) in the remaining 3409 children. Skiascopy with cycloplegia was done and refractive error readings were reported as the spherical equivalent (SE). Myopia was defined as SE < or = -0.5 D, hyperopia as SE > or = +1.5 D. Anisometropia was diagnosed when the difference in the refraction of both eyes was > 1.0 D. The parents completed a questionnaire on the child's weight and term of birth. Data analysis was performed using chi-square test. P values of less than 0.05 were considered statistically significant.
Results:
Hyperopia was observed more frequently in 6-7 year-old children whose birth weight was > 2500 grams (p < 0.05) - table 1. Additionally, it was found that anisometropia was less frequent in 10-11 year-old children whose birth weight was > 2500 g (p < 0.05) - table 2.
Conclusion:
Low birth weight may have an effect on the prevalence of refractive errors among schoolchidren.
Related Concept Videos
Focusing of Light in the Eye
Regression Toward the Mean
Photoreceptors and Visual Pathways
Environmental Influences on Intelligence
