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Related Experiment Video

Updated: Jan 21, 2026

Subjective Refraction Test Using a Smartphone for Vision Screening
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Can the Red Reflex Test Detect Unequal Refractive Error?

Kara C LaMattina1, Aldo Vagge1, Leonard B Nelson1

  • 1Pediatric Ophthalmology and Strabismus, Wills Eye Hospital, Philadelphia, PA.

The Journal of Pediatrics
|August 6, 2019
PubMed
Summary
This summary is machine-generated.

The red reflex test accurately detects anisometropia in children. This ophthalmologist-performed screening tool shows high sensitivity for detecting refractive errors, aiding early diagnosis.

Keywords:
Brückner testamblyopiaanisometropiapupillary crescentred reflex testrefractive error

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Area of Science:

  • Ophthalmology
  • Pediatric Ophthalmology
  • Vision Science

Background:

  • Anisometropia, a significant refractive error, can lead to amblyopia if undetected in children.
  • Early detection of anisometropia is crucial for timely intervention and optimal visual development.

Purpose of the Study:

  • To evaluate the diagnostic accuracy of the red reflex test in identifying anisometropia in pediatric patients.
  • To determine the sensitivity and specificity of the red reflex test for detecting spherical and cylindrical anisometropia.

Main Methods:

  • A prospective, single-masked study involving 92 new pediatric patients (<18 years) without prior pupillary dilation.
  • The red reflex test was performed by a masked fellow using direct ophthalmoscopy, followed by cycloplegic refraction by a pediatric ophthalmologist.
  • Exclusion criteria included strabismus, anisocoria, media opacity, and other visual impairments.

Main Results:

  • The red reflex test demonstrated 90.6% sensitivity and 58.3% specificity for spherical anisometropia (≥0.125 D).
  • For cylindrical anisometropia (≥0.25 D), sensitivity was 81.3% and specificity was 70%.
  • All cases of significant anisometropia (>1.5 D) were accurately detected.

Conclusions:

  • The red reflex test is a valuable and accurate screening tool for detecting anisometropia in children.
  • When performed by an ophthalmologist, this simple test can aid in the early identification of refractive errors.