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Differences between objective and subjective refractions after radial keratotomy.

G E Russell1, J P Bergmanson, R Barbeito

  • 1University of Houston, College of Optometry, Tex. 77004.

Refractive & Corneal Surgery
|July 1, 1992
PubMed
Summary
This summary is machine-generated.

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Radial keratotomy significantly weakens the link between automatic and subjective eye refractions. Post-surgery, automatic refractions show more myopia, especially in younger patients, due to optical changes.

Area of Science:

  • Ophthalmology
  • Optometry
  • Refractive Surgery

Background:

  • Automatic and subjective refractions typically agree in healthy eyes.
  • Radial keratotomy (RK) surgery appears to disrupt the correlation between objective and subjective refraction.

Purpose of the Study:

  • To investigate the impact of radial keratotomy on the agreement between automatic and subjective refractions.
  • To identify factors influencing refractive discrepancies after RK.

Main Methods:

  • Seventy-two myopic patients underwent objective (autorefractor) and subjective refractions pre- and post-RK.
  • Refractions were performed without cycloplegia.

Main Results:

  • Preoperative refraction agreement was good (0.25 D difference).

Related Experiment Videos

  • Postoperative, automatic refractions were significantly more myopic (1.25 D difference).
  • Younger patients (<40 years) showed a greater myopic shift in automatic refractions compared to older patients.

    • Conclusions:

    • Post-RK refractive discrepancies may stem from induced optical aberrations and pupil size changes.
    • These refractive inconsistencies can contribute to visual fluctuations experienced by RK patients.
    • Accurate refraction in RK patients is complex and influenced by surgical factors and patient age.