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Related Experiment Videos

Clinical evaluation of refractive techniques

A M McKendrick1, N A Brennan

  • 1Department of Optometry, University of Melbourne, Carlton, Australia.

Journal of the American Optometric Association
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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Automated refractometers and autokeratometers showed comparable precision for corneal curvature. However, subjective refraction achieved better visual acuity than automated methods, despite lower precision.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Comparison of automated refractometers (Shin-Nippon RC380, Topcon KR-3100) and autokeratometer (Alcon) against subjective refraction and conventional keratometry.
  • Evaluation of diagnostic instruments in optometric and ophthalmologic practice.

Purpose of the Study:

  • To assess the accuracy and precision of commercial auto kerato-refractometers and autokeratometers.
  • To compare automated refractive error and corneal curvature measurements with subjective refraction and conventional keratometry.

Main Methods:

  • 20 subjects underwent measurements of refractive error and corneal curvature.
  • Data converted to vector format for simultaneous analysis of spherical and cylindrical errors.
  • Repeatability and precision assessed for different instruments and measurement conditions.

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Main Results:

  • Shin-Nippon showed higher repeatability than Topcon when measurements were immediate; the trend reversed with realignment.
  • Subjective refraction yielded significantly better visual acuity (93% >= 6/6) compared to Topcon (85%) and Shin-Nippon (45%).
  • Corneal curvature measurements by all methods demonstrated minimal bias and comparable precision.

Conclusions:

  • Subjective refraction generally achieved superior visual acuity compared to automated methods.
  • Automated methods exhibited considerably poorer precision in refractive error determination.
  • All tested keratometry measurement methods yielded similar results regarding bias and precision.