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The shape factor in radial keratotomy.

P A Starr

    Eye (London, England)
    |January 1, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Photokeratoscopy revealed that the corneal shape factor changed after radial keratotomy for myopia reduction. Pre-operative myopia correlated with the shape factor, influencing surgical planning for emmetropia.

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    Area of Science:

    • Ophthalmology and Optometry
    • Corneal Surgery
    • Refractive Error Correction

    Background:

    • Myopia, a common refractive error, is often treated with surgical interventions like radial keratotomy.
    • Corneal contour changes significantly impact refractive outcomes after surgery.
    • Photokeratoscopy is a diagnostic tool used to analyze corneal topography.

    Purpose of the Study:

    • To investigate the relationship between corneal shape factor and myopia reduction following radial keratotomy.
    • To determine if the corneal shape factor can predict surgical outcomes for achieving emmetropia.
    • To evaluate the role of the shape factor in surgical planning for radial keratotomy.

    Main Methods:

    • Photokeratoscopy was used to measure the corneal shape factor before and after radial keratotomy in 51 eyes.

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  • Patients had a mean pre-operative myopia of -5.67 Diopters Sphere (DS).
  • A retrospective analysis correlated pre-operative myopia, shape factor, and optical zone size.

    • Main Results:

    • Radial keratotomy resulted in a mean myopia reduction of -5.23 DS.
    • The corneal shape factor consistently became negative in all treated eyes post-surgery.
    • A significant relationship was identified between pre-operative myopia, the shape factor, and the untouched optical zone size.

    Conclusions:

    • The corneal shape factor is a crucial parameter to consider in surgical planning for radial keratotomy.
    • Understanding the pre-operative shape factor can help optimize the optical zone size for achieving emmetropia.
    • Corneal contour analysis via shape factor provides valuable insights into refractive surgery outcomes.