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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

Code of Federal Regulations

Code of Federal Regulations 407

[Please see PDF for image: EC04NO91.005 ]

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
Code of Federal Regulations 408
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.

Code of Federal Regulations

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

Code of Federal Regulations

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

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