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Background illumination and automated perimetry.

K M Klewin, R L Radius

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |March 1, 1986
    PubMed
    Summary
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    Neutral density filters greater than 0.5 log units significantly reduced visual field sensitivity in normal subjects. Low background illumination in automated perimetry may amplify minor ocular media light loss effects.

    Area of Science:

    • Ophthalmology
    • Visual Neuroscience
    • Optometry

    Background:

    • Automated perimetry is crucial for assessing visual field function.
    • Ocular media opacity can affect light transmission and visual field test results.
    • Understanding the impact of light reduction is vital for accurate visual field interpretation.

    Purpose of the Study:

    • To evaluate the effect of neutral density filters on visual field sensitivity.
    • To determine the threshold at which visual field sensitivity is significantly reduced.
    • To investigate the influence of low background illumination on perimetry outcomes.

    Main Methods:

    • Visual field function was assessed in 31 normal volunteers using an OCTOPUS automated projection perimeter.
    • Serial visual field evaluations were conducted with neutral filters of increasing optical density (0.5 log units and greater).

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  • Threshold determinations were compared across different filter conditions.

    • Main Results:

    • Significant reductions in threshold sensitivity were observed at multiple test spots within the central 30 degrees visual field.
    • These reductions were associated with neutral density filters of 0.5 log units or greater.
    • The low background illumination (4.0 apostilbs) of the perimeter may exacerbate the impact of minor light transmission losses.

    Conclusions:

    • Even minor reductions in light transmission through ocular media can significantly alter threshold sensitivity measurements.
    • Careful consideration of background illumination and potential media opacity is necessary for accurate visual field interpretation.
    • Automated perimetry results can be sensitive to subtle changes in light transmission, particularly under low illumination conditions.