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Trapezoidal keratotomy. A vector analysis.

M P Merck, P A Williams, R L Lindstrom

    Ophthalmology
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Trapezoidal astigmatic keratotomy (Ruiz keratotomy) effectively reduced corneal astigmatism. However, surgically induced changes varied with optical zone size, sometimes creating new astigmatic errors.

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    Area of Science:

    • Ophthalmology
    • Corneal Surgery
    • Refractive Surgery

    Background:

    • High regular astigmatism can significantly impair vision, particularly after corneal transplantation or cataract surgery.
    • Astigmatic keratotomy is a surgical technique used to correct corneal astigmatism.

    Purpose of the Study:

    • To evaluate the effectiveness of trapezoidal astigmatic keratotomy (Ruiz keratotomy) in correcting high regular astigmatism.
    • To analyze the relationship between optical zone size and surgically induced changes in corneal curvature.

    Main Methods:

    • Twenty-three eyes of 23 patients with high regular astigmatism underwent Ruiz keratotomy.
    • Preoperative and postoperative keratometry readings were analyzed using trigonometric vector analysis.
    • Patient follow-up ranged from 1 to 15 months (mean of 5 months).

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    Main Results:

    • Surgically induced change in corneal curvature ranged from 1.28 to 14.21 diopters.
    • The magnitude of induced change was inversely proportional to the optical zone size.
    • In many cases, the induced change did not fully correct the preoperative astigmatism or created a new astigmatic error in a different meridian.

    Conclusions:

    • Ruiz keratotomy can induce significant changes in corneal curvature, but its effectiveness in reducing residual astigmatism is variable.
    • Optical zone size is a critical factor influencing the outcome of astigmatic keratotomy.
    • Further research may be needed to optimize surgical parameters for predictable astigmatic correction.