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Related Experiment Videos

Ophthalmometry without patient fixation

P Gruenberg, W Manning, D Miller

    Annals of Ophthalmology
    |April 1, 1981
    PubMed
    Summary

    Accurate corneal curvature measurement is challenging with nonfixating subjects. This study details a simple tripod attachment for ophthalmometers, enabling precise measurements even when the visual axis is misaligned.

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    Area of Science:

    • Ophthalmology
    • Optometry
    • Biomedical Engineering

    Background:

    • Corneal asphericity necessitates alignment of the visual axis, instrument axis, and corneal apex for accurate ophthalmometry.
    • Nonfixating subjects (animals and humans) often fail to align their visual axis with the instrument's optical axis, complicating measurements.

    Purpose of the Study:

    • To describe an innovative method for achieving accurate corneal curvature measurements in nonfixating subjects.
    • To present a practical modification to the Haag Streit ophthalmometer for improved usability.

    Main Methods:

    • Attachment of a photographer's tripod pan arm to the Haag Streit ophthalmometer.
    • Development of a technique to ensure accurate corneal curvature measurement despite visual axis misalignment.

    Main Results:

    • The described method allows for accurate corneal curvature measurements.
    • The modification facilitates precise measurements even when the subject's visual axis is not aligned with the instrument's axis.

    Conclusions:

    • The tripod pan arm attachment provides a viable solution for accurate ophthalmometry in nonfixating subjects.
    • This technique enhances the diagnostic capabilities of the Haag Streit ophthalmometer for challenging cases.

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