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Angle κ Measurement and Its Correlation with Other Ocular Parameters in Normal Population by a New Imaging Modality.

Hani M Gharieb Ibrahim, Hesham Mohamed Gharieb, Ihab Saad Othman

    Optometry and Vision Science : Official Publication of the American Academy of Optometry
    |June 3, 2022
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    Summary

    This study established normative angle kappa (κ) values using Orbscan 3, finding averages of 2.3° in all eyes, crucial for optimizing refractive surgery. These findings provide essential data for laser vision correction procedures.

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    Area of Science:

    • Ophthalmology
    • Corneal topography
    • Refractive surgery

    Background:

    • Angle kappa (κ) is a critical parameter in refractive surgery planning.
    • Accurate measurement of angle kappa is essential for optimizing surgical outcomes.
    • Normative data for angle kappa can vary based on measurement devices and populations.

    Purpose of the Study:

    • To obtain normative database for angle kappa (κ) using Orbscan 3.
    • To determine the mean angle kappa value in healthy eyes of patients seeking laser vision correction.
    • To establish a reference range for angle kappa for pre-operative assessment.

    Main Methods:

    • A cross-sectional study involving 1815 eyes of 908 candidates for laser refractive surgery.
    • Orbscan 3 was utilized to measure angle kappa and other corneal parameters.
    • Included measurements: XY intercepts, keratometry, central corneal thickness, white-to-white diameter, and corneal asphericity (Qf, Qb).

    Main Results:

    • The mean angle kappa (κ) was 2.3 ± 1.34° in the total sample.
    • Mean angle kappa values were 2.23 ± 1.36° in myopic eyes and 3.3 ± 1.5° in hyperopic eyes.
    • Positive correlations were observed between angle kappa and age, spherical equivalent, and white-to-white diameter.

    Conclusions:

    • The study provides normative angle kappa (κ) data measured by Orbscan 3, with a mean of 2.3 ± 1.34°.
    • Observed variations may be influenced by software differences and high axial length in the study cohort.
    • This normative database is significant for optimizing refractive surgery outcomes.