38 CFR 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 = 22 1/2° average concentric contraction.

(Authority: 38 U.S.C. 1155) [43 FR 45352, Oct. 2, 1978, as amended at 73 FR 66549, Nov. 10, 2008]