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Related Experiment Videos

Comparison of three computerized videokeratoscopy systems with keratometry

R C Moura1, B L Bowyer, S X Stevens

  • 1Federal University of Sao Paulo, Brazil.

Cornea
|October 2, 1998
PubMed
Summary

Computerized videokeratoscopy systems show reproducible results within each device. However, significant differences exist between systems, meaning their clinical data should not be interchanged.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optometry

Background:

  • Computerized videokeratoscopy is crucial for corneal topography analysis.
  • Evaluating the reproducibility and inter-system agreement of these devices is essential for clinical applications.

Purpose of the Study:

  • To compare the reproducibility of three commercial videokeratoscopy systems (EyeSys, TechnoMed C-Scan, PAR Corneal Topography System [CTS]) using normal eyes and calibrated objects.

Main Methods:

  • Three videokeratoscopy systems and a manual keratometer were used.
  • Calibration spheres and 20 eyes from 10 normal subjects underwent 10 serial examinations on each system.
  • Average keratometry (K) within the central 3.0 mm was compared between systems and with manual keratometry.

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Main Results:

  • All videokeratoscopy systems demonstrated good correlation with each other and manual keratometry for calibration objects.
  • EyeSys showed the strongest correlation with manual keratometry (35%), followed by PAR-CTS (25%) and C-Scan (5%).
  • Significant differences (p < 0.05) were found between systems when analyzing clinical data, with average K differences <0.35 D.

Conclusions:

  • While individual videokeratoscopy systems provide reproducible measurements, significant inter-system variability exists.
  • Results from different topography systems should not be assumed to be interchangeable in clinical studies.