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Related Experiment Videos

Method of evaluating ultrasonic pachometers.

T Ling, A Ho, B A Holden

    American Journal of Optometry and Physiological Optics
    |June 1, 1986
    PubMed
    Summary
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    This study presents a novel method for assessing ultrasonic pachometer accuracy using hydrogel contact lenses. The Vida-55 ultrasonic pachometer accurately measures corneal thickness when the correct ultrasound velocity is applied.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Materials Science

    Background:

    • Ultrasonic pachometers are widely used for corneal thickness measurement.
    • Limited data exists on the performance and accuracy of commercially available ultrasonic pachometers.
    • Accurate corneal thickness measurement is crucial for diagnosing and managing various eye conditions.

    Purpose of the Study:

    • To develop and validate a technique for evaluating ultrasonic pachometer accuracy.
    • To assess the performance of the Vida-55 ultrasonic pachometer.
    • To determine the ultrasonic velocity in cat corneal tissue and hydrogel contact lens materials.

    Main Methods:

    • Simulated corneal thickness measurements using hydrogel contact lenses.
    • Comparison of on-eye measurements (ultrasonic and optical pachometry) with absolute lens thickness (thickness gauge).

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  • Determination of ultrasonic velocity in biological tissues and synthetic materials.

    • Main Results:

    • The Vida-55 ultrasonic pachometer demonstrated accurate corneal thickness measurements when the appropriate ultrasound velocity was utilized (SEM = 6 microns).
    • The ultrasonic velocity in cat corneal tissue was determined to be 1590 m/s at 33°C.
    • Ultrasonic velocities for hydroxyethyl methacrylate (HEMA) and Snoflex 50 hydrogel materials were measured.

    Conclusions:

    • The developed technique provides a reliable method for evaluating ultrasonic pachometer performance.
    • The Vida-55 ultrasonic pachometer is accurate for corneal thickness assessment with proper calibration.
    • Accurate determination of ultrasound velocity is critical for precise pachymetry readings.