CVNet - query on interpretation of color vision tests

From: Color and Vision Network (cvnet@lawton.ewind.com)
Date: Thu May 25 2000 - 08:40:39 PDT

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    From: Gene4@aol.com
    Subject: Assistance Requested
    To: cvnet@lawton.ewind.com

    I would appreciate assistance from the group. The test results below are
    from two individuals applying to become police officers. The indoor tests
    were given in March. The Outdoor tests given in May.

    Three color vision tests were given to two persons: Ishihara, Farnsworth
    D-15 and Lanthony 15 Hue. Both were desaturated panel tests.

    The Ishihara and Farnsworth were administered in an office under florescent
    lighting and outside in sunlight. The Lanthony in sunlight only.

    Person 1 Results:

    INDOOR Florescent Lighting:
    Isihara: Unknown: Results recorded as "fail."
    Farnsworth: 1, 2, 15, 3, 14 4 ,13, 5, 12, 11, 6, 10, 7, 9, 8

    OUTDOOR Sunlight
    Ishihara: 17 out of 17 correct
    Farnsworth: Perfect Score
    Lanthony: 1,15,2,14,5,13,12,4,5,11,10,6,9,7,8

    The test is being used in an employment process. The Lanthony was given due
    to concerns the individual might have obtained a Farnsworth to practice on.
    I suspect this person wore an x-chrom lens that was undetected during the
    test (the physician did not check). Is there another explanation for these
    scores?

    Person 2 Results
     
    INDOOR Florescent Lighting:
    Isihara: 1 out of 7 plates correct.
    Farnsworth: 1, 15, 2, 14, 3, 13, 4, 5, 12, 11, 6, 10, 7, 9, 8

    OUTDOOR Sunlight
    Ishihara: 17 out of 17 correct
    Farnsworth: Perfect Score
    Lanthony: Perfect Score

    Is it possible to have obtained results like this without cheating on the
    test with an x-chrom lens?

    Gene Carmean
    GCarmean@med-tox.com
    www.med-tox.com



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