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Related Experiment Videos

Negative predictive value of a population-based preschool vision screening program.

I De Becker1, H J MacPherson, G R LaRoche

  • 1Department of Ophthalmology, Dalhousie University, Halifax, Nova Scotia, Canada.

Ophthalmology
|June 1, 1992
PubMed
Summary
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The Enhanced Vision Screening Program effectively identifies vision problems in children, with a high negative predictive value of 97.6%. However, it

Area of Science:

  • Ophthalmology
  • Pediatric Vision Care
  • Public Health Screening

Background:

  • The Enhanced Vision Screening Program is a population-based initiative examining children for amblyopia, strabismus, and high refractive errors.
  • The program screens an average of 11,910 children aged 4.5 to 5.5 years annually.
  • To date, 59,782 children have been examined.

Purpose of the Study:

  • To determine the negative predictive value (NPV) of the Enhanced Vision Screening Program.
  • To assess the probability that a child who passes the screening test does not have amblyopia, strabismus, or high refractive errors.

Main Methods:

  • A total of 11,734 children passed the initial vision screening.
  • 200 of these children were randomly selected for a gold standard examination.

Related Experiment Videos

  • Examinations were conducted by an orthoptist and an ophthalmologist.

    • Main Results:

    • 157 out of 200 selected children completed the gold standard evaluation.
    • The overall NPV for any potentially vision-threatening ocular condition was 97.6%.
    • The NPV for visually significant conditions targeted by the screening was 98.7%.

    Conclusions:

    • The screening program's NPV is not 100%, meaning some cases of amblyopia, strabismus, or refractive errors may be missed.
    • Rare, potentially vision-threatening conditions might also go undetected.
    • Parents should be informed about the screening's limitations when results are shared.