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Calibration error in dark adaptometer.

J M Maggiano, G A Fishman, L S Evans

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |June 1, 1978
    PubMed
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    A calibration error in the Goldmann-Weekers dark adaptometer causes overestimation of retinal eccentricity. This occurs because the tested eye is off-center, but true retinal locus can be calculated.

    Area of Science:

    • Ophthalmology
    • Visual Neuroscience
    • Medical Device Calibration

    Background:

    • The Goldmann-Weekers dark adaptometer is a key instrument for assessing retinal function.
    • Accurate measurement of retinal eccentricity is crucial for interpreting dark adaptation data.

    Purpose of the Study:

    • To identify and explain a calibration error in the adjustable fixation device of the Goldmann-Weekers dark adaptometer.
    • To provide a method for correcting the overestimation of retinal eccentricity caused by this error.

    Main Methods:

    • Analysis of the Goldmann-Weekers dark adaptometer's adjustable fixation device.
    • Geometric and trigonometric analysis of the optical system to determine the source of error.
    • Development of a computational method to correct measured retinal eccentricity.

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    Main Results:

    • A consistent and predictable overestimation of retinal eccentricity was identified.
    • The error stems from the tested eye not being positioned at the geometric center of the projection sphere.
    • Trigonometric analysis allows for the computation of the true retinal locus.

    Conclusions:

    • The adjustable fixation device on certain Goldmann-Weekers dark adaptometer models contains a calibration error.
    • This error leads to inaccurate retinal eccentricity measurements.
    • A method for correction using trigonometric analysis and a provided conversion table is available.