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Related Experiment Videos

Short-term repeatability of hand-held keratometry measurements.

J A Shin1, R E Manny, R N Kleinstein

  • 1Southern California College of Optometry, Fullerton, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 20, 1999
PubMed
Summary

The Alcon Auto-Keratometer offers repeatable corneal curvature measurements in children. Averaging two readings ensures reliable results within +/-0.50 D for refractive error studies.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Pediatric Eye Care

Background:

  • Corneal curvature is a key factor in refractive error development.
  • The Alcon Auto-Keratometer is used in the CLEERE Study to measure corneal curvature in schoolchildren.
  • Previous research validated the Alcon Auto-Keratometer's accuracy but not its repeatability.

Purpose of the Study:

  • To assess the repeatability of the hand-held Alcon Auto-Keratometer for measuring anterior corneal curvature.
  • To determine the optimal number of readings for achieving reliable measurements.
  • To establish the short-term agreement of the instrument in a pediatric population.

Main Methods:

  • Sixty children participated in the study across two optometry clinics.
  • Two sets of five hand-held keratometry measurements were taken on each child's right eye.

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  • Measurements were repeated at least 10 minutes apart by the same investigator at each site.

    • Main Results:

    • Mean differences in corneal curvature measurements between occasions were not statistically significant.
    • Averaging the first two readings significantly improved repeatability, especially for the steep meridian.
    • The 95% limits of agreement for the average of two readings were within +/-0.39 D for meridians and +/-0.24 D for vector components.

    Conclusions:

    • The Alcon hand-held keratometer demonstrates good repeatability for corneal curvature measurements.
    • A short-term agreement within +/-0.50 D is achievable.
    • Manually averaging two consecutive measurements is essential for obtaining reliable results.