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Pachometry: a comparison between touch and overlap measurement method.

J F Molinari, T Bonds

    American Journal of Optometry and Physiological Optics
    |January 1, 1983
    PubMed
    Summary
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    Central corneal thickness measurement accuracy varied between two methods. One method involved touching split images, while the other overlapped them, showing a statistically significant difference in results.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Optometry

    Background:

    • Accurate central corneal thickness (CCT) measurement is crucial for diagnosing and managing various ocular conditions.
    • Standardized pachymetry techniques are essential for reliable clinical data.

    Purpose of the Study:

    • To compare the accuracy and reliability of two distinct endpoint methods for CCT measurement using a Haag-Streit 900 slitlamp and pachometer.
    • To determine if investigator variability impacts CCT measurements when using different endpoint setting techniques.

    Main Methods:

    • Twelve human eyes underwent CCT measurements by two independent investigators.
    • Two endpoint visualization methods were employed: (1) touching of split images at the epithelium/endothelium and (2) overlapping of split images.

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  • Measurements were performed using a Haag-Streit 900 slitlamp with a standard pachometer.

    • Main Results:

    • Investigator CCT measurements were comparable, indicating good inter-observer reliability.
    • A statistically significant difference was observed between the two endpoint measurement methods.
    • The 'touching' method and 'overlapping' method yielded different CCT values.

    Conclusions:

    • The choice of endpoint visualization method significantly impacts CCT measurements.
    • Standardization of the endpoint setting technique is recommended for consistent and reproducible CCT assessments in clinical practice.
    • Further research may be needed to validate the optimal method for CCT determination.