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Related Experiment Videos

Radial keratotomy clear zone diameter errors

M R Grimmett1, G S Ogawa

  • 1Bascom Palmer Eye Institute, Palm Beach Gardens, FL 33418, USA.

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|December 29, 1998
PubMed
Summary
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Radial keratotomy (RK) surgery shows significant variability in achieved clear zone diameters, with 69% of measurements differing by over 0.25 mm. These diameter errors did not correlate with refractive outcomes in this study.

Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Radial keratotomy (RK) is a surgical procedure to correct myopia.
  • Accurate control of the clear zone diameter is crucial for predictable refractive outcomes in RK.

Purpose of the Study:

  • To assess the variability of achieved clear zone diameters in radial keratotomy (RK).
  • To investigate the correlation between clear zone diameter errors and refractive outcomes post-RK.

Main Methods:

  • Retrospective analysis of 26 patients (51 eyes) who underwent RK.
  • Measurement of central clear zone diameters using slit-lamp and photography.
  • Statistical comparison of achieved vs. intended clear zone sizes and refractive results.

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Main Results:

  • Sixty-two of 90 (69%) eyes had achieved clear zone diameters differing by more than 0.25 mm from the intended size.
  • Observed variations in clear zone diameter reached up to +/- 0.80 mm.
  • No statistically significant difference in average clear zone diameter error was found among undercorrection, emmetropia, and overcorrection groups.

Conclusions:

  • Significant variability exists in achieved clear zone diameters following radial keratotomy, even in experienced hands.
  • The achieved clear zone diameter can deviate substantially from the intended size in centripetal RK.