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Related Experiment Videos

Rod saturation perimetry. Testing of the cone function with achromatic objects.

V Elenius

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |April 1, 1985
    PubMed
    Summary

    A woman with cone dysfunction experienced visual field restriction in bright light. Tangential perimetry revealed an absolute ring scotoma, highlighting challenges in diagnosing subtle visual field defects.

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    Field quadrant asymmetry in perimetric thresholds: results of normal and red-green-deficient persons.

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    Visual thresholds measured with red test object on backgrounds of high and low luminance.

    Acta ophthalmologica·1987

    Area of Science:

    • Ophthalmology
    • Visual Neuroscience

    Background:

    • Cone dysfunction is a condition affecting color vision and visual acuity.
    • Standard visual field testing may not detect subtle visual field defects.

    Observation:

    • A patient with slowly progressive cone dysfunction and normal rod function reported visual field restriction in bright light.
    • Normal results were observed with standard Goldmann perimetry.

    Findings:

    • Tangential perimetry using darker test objects on a bright white background revealed a large ring scotoma in both eyes.
    • This ring scotoma became absolute when rod function was saturated using a specific background luminance, indicating severe cone-specific visual field loss.

    Implications:

    • Subtle visual field defects in cone dysfunction may be missed by standard perimetry.
    • Advanced perimetric techniques are crucial for accurate diagnosis and management of retinal disorders.
    • This case underscores the importance of specialized visual field testing for characterizing visual field abnormalities.

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