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Optical pachometry measurements: reliability and variability.

A C Snyder

    American Journal of Optometry and Physiological Optics
    |June 1, 1984
    PubMed
    Summary
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    Accurate polymethyl methacrylate (PMMA) lens thickness measurements are crucial. Changes less than 1-2% may not represent true corneal thickness alterations, according to this study.

    Area of Science:

    • Ophthalmology
    • Biomaterials Science
    • Optometry

    Background:

    • Polymethyl methacrylate (PMMA) is a common material for intraocular lenses (IOLs).
    • Accurate measurement of corneal thickness is essential for various ophthalmic procedures and research.
    • Understanding measurement variability is key to interpreting corneal thickness changes.

    Purpose of the Study:

    • To assess the measurement variability of corneal thickness using a pachometer.
    • To establish a threshold for determining significant changes in corneal thickness.
    • To evaluate the repeatability of thickness measurements by an experienced investigator.

    Main Methods:

    • Polymethyl methacrylate (PMMA) lenses of known thickness were measured.
    • Measurements were performed by a single, experienced investigator using a pachometer.

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  • Repeatability and variation in measurements were statistically analyzed.

    • Main Results:

    • The investigator maintained thickness measurement variation within 1% over time.
    • Measurement repeatability was high, with a standard deviation (SD) less than 1%.
    • The study suggests that changes less than 1-2% should not be considered true corneal thickness changes.

    Conclusions:

    • Experienced investigators can achieve highly repeatable corneal thickness measurements.
    • A threshold of 1-2% change is proposed to distinguish true corneal thickness alterations from measurement noise.
    • These findings have implications for monitoring corneal health and evaluating refractive surgery outcomes.