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Related Experiment Videos

The Westheimer function as an indicator of fixation locus

J M Enoch, C A Johnson

    American Journal of Ophthalmology
    |April 1, 1977
    PubMed
    Summary

    The Westheimer function remains stable, aiding in assessing fixation accuracy. This study quantified eccentric fixation in a patient with macular degeneration, estimating it at 4 degrees.

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    Area of Science:

    • Ophthalmology
    • Visual Neuroscience

    Background:

    • The Westheimer function describes spatial summation and inhibition in the visual field.
    • Understanding fixation stability is crucial for visual function assessment.

    Observation:

    • The Westheimer function's dimensions are consistent across diverse populations and over time.
    • Function dimensions correlate with the eccentricity of visual fixation.

    Findings:

    • The Westheimer function can determine if an individual is fixating centrally.
    • It allows for the estimation of eccentric fixation degree.
    • In a patient with senile macular degeneration, summation and inhibition regions were identified.
    • Eccentric fixation was estimated at approximately 4 degrees in this patient.

    Implications:

    • The Westheimer function offers a reliable method for assessing fixation accuracy.
    • It can quantify eccentric fixation, important for diagnosing and managing visual impairments.
    • This technique aids in understanding visual field defects in conditions like macular degeneration.

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