How is the Total Deviation of a Statpac-2 Printout calculated

Discussion in 'Optometry Archives' started by Abe Sleem, Aug 16, 2003.

  1. Abe Sleem

    Abe Sleem Guest

    How is the Total Deviation of a Statpac-2 displayed by the Humphery
    Visual Field Analyzer calulated. Does anyone know the principle or
    even the specific means?

    The Pattern Deviation from what I understand is based on the
    population means for specific age /gender groups, etc.

    -Abe S.

    Abe Sleem, Aug 16, 2003
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  2. Abe Sleem

    nipidoc Guest

    The values in the total deviation plot represent the difference in
    decibels between the patient's tested results and the age corrected
    normal values at each tested point in the field.

    The pattern deviation is obtained by adjusting the total deviation up
    be a specific value to compensate for an overall depression of
    sensitivity, such as that which would result from cataracts, or small

    The pattern devation can also shift the total deviation DOWN for
    patients who are "supernormal" and this process can show a localized

    nipidoc, Aug 17, 2003
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