§ 4.76aComputation of average concentric contraction of visual fields.

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Table III—Normal Visual Field Extent at 8 Principal Meridians

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

Criteria	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.

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

End of § 4.76a

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