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Constant-area applanation tonography

R A Moses, W J Grodzki, R J Arnzen

    Investigative Ophthalmology & Visual Science
    |June 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    A new tonography device, based on the MacKay-Marg tonometer, maintains corneal applanation. This device shows a linear pressure decrease followed by a plateau, with final pressures often lower than Goldmann applanation pressure.

    Area of Science:

    • Ophthalmology
    • Biomedical Engineering
    • Ocular Physiology

    Background:

    • Tonography is crucial for assessing intraocular pressure (IOP) and aqueous humor dynamics.
    • Existing tonometry methods have limitations in maintaining consistent corneal applanation.
    • The MacKay-Marg tonometer principle offers a basis for improved IOP measurement.

    Purpose of the Study:

    • To construct and evaluate a novel tonography device based on the MacKay-Marg tonometer.
    • To assess the device's ability to maintain a preselected corneal applanation area.
    • To characterize the pressure decrease over time during tonography and compare it to established methods.

    Main Methods:

    • Construction of a tonography device utilizing the MacKay-Marg principle.
    • Achieving and maintaining corneal applanation over a specific area (5.0-6.0 mm diameter).

    Related Experiment Videos

  • Monitoring intraocular pressure changes over time, simulating fluid injection response.

    • Main Results:

    • The device successfully applanated the cornea to the preselected area and maintained it.
    • Intraocular pressure typically decreased linearly over time, followed by a distinct pressure plateau.
    • In most cases, the final tonography pressure after 4 minutes was lower than the initial Goldmann applanation pressure.

    Conclusions:

    • The developed MacKay-Marg based tonography device is capable of consistent corneal applanation.
    • The observed pressure decay pattern provides insights into ocular fluid dynamics.
    • The device shows potential for accurate IOP assessment, possibly offering advantages over the Goldmann method.