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Comparison of repeat videokeratography: repeatability and accuracy

M Jeandervin1, J Barr

  • 1Ohio State University College of Optometry, Columbus, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|October 21, 1998
PubMed
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This study compared five eye measurement devices. While no significant repeatability differences were found, the EyeSys System 2000 showed the best results, and the Humphrey Atlas was the most accurate videokeratography instrument.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Accurate corneal measurements are crucial for contact lens fitting and refractive surgery.
  • Videokeratography instruments offer advanced corneal mapping capabilities compared to manual keratometry.

Purpose of the Study:

  • To compare the repeatability and accuracy of four commercial videokeratography systems and one manual keratometer.
  • To evaluate the clinical relevance of differences in repeatability and accuracy among these instruments.

Main Methods:

  • Ten optometry students and two employees underwent measurements using Alcon EyeMap EH-290, EyeSys System 2000, Humphrey Mastervue, Humphrey Atlas, and Marco manual keratometer.
  • Two independent measurements were taken on the right eyes for each instrument.

Related Experiment Videos

  • Accuracy was tested using four calibration spheres with selected videokeratography systems.

    • Main Results:

    • No statistically significant differences in repeatability were observed across the instruments.
    • The EyeSys System 2000 demonstrated the narrowest 95% limits of agreement, suggesting high repeatability.
    • The Humphrey Atlas exhibited the highest accuracy, with the greatest percentage of data points within +/- 0.37 D of known values.

    Conclusions:

    • While statistical repeatability was similar, the EyeSys System 2000's superior repeatability may hold clinical significance.
    • The Humphrey Atlas was the most accurate instrument tested, despite variations in accuracy among devices.
    • The choice of instrument can impact diagnostic precision in corneal evaluation.