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Hyperopic shift after refractive keratotomy using the Casebeer System

T P Werblin, G M Stafford

    Journal of Cataract and Refractive Surgery
    |October 1, 1996
    PubMed
    Summary
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    Refractive keratotomy can cause a hyperopic shift, which decreases over three years. For optimal outcomes, aim for a slight undercorrection of -0.5 to -0.7 diopters after refractive surgery.

    Area of Science:

    • Ophthalmology
    • Refractive Surgery
    • Corneal Surgery

    Background:

    • Refractive keratotomy (RK) is a surgical procedure to correct vision.
    • Hyperopic shift is a common complication following RK.

    Purpose of the Study:

    • To quantify the degree of hyperopic shift after refractive keratotomy.
    • To analyze the stability of refractive changes over time.

    Main Methods:

    • Retrospective analysis of 241 RK procedures in 128 patients.
    • Procedures performed using Casebeer nomograms.
    • Refractive data collected at 3 months, 1 year, and 3 years post-surgery.

    Main Results:

    • The hyperopic shift decreased significantly from +0.34 D/year to +0.12 D/year over 3 years.

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  • Eyes with higher intended correction (>6.0 D) showed greater instability.
  • Eyes with lower intended correction (<5.0 D) were more stable.

    • Conclusions:

    • The average hyperopic shift was +0.6 D in the first 3 years.
    • A slight undercorrection (-0.5 D to -0.7 D) is recommended as the refractive endpoint.
    • This strategy aims to optimize outcomes for primary and enhanced RK surgeries.