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  § 4.76a - Computation of average concentric contraction of visual fields.

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  • § 4.76a Computation of average concentric contraction of visual fields.

    Table III - Normal Visual Field Extent at 8 Principal Meridians

    Meridian Normal degrees
    Temporally 85
    Down temporally 85
    Down 65
    Down nasally 50
    Nasally 60
    Up nasally 55
    Up 45
    Up temporally 55
    Total 500

    Example of computation of concentric contraction under the schedule with abnormal findings taken from Figure 1.

    Loss Degrees
    Temporally 55
    Down temporally 55
    Down 45
    Down nasally 30
    Nasally 40
    Up nasally 35
    Up 25
    Up temporally 35
    Total loss 320

    Remaining field 500° minus 320° = 180°. 180° ÷ 8 = 221⁄2° average concentric contraction.

    (Authority: 38 U.S.C. 1155)

    [43 FR 45352, Oct. 2, 1978, as amended at 73 FR 66549, Nov. 10, 2008]