Title 38
SECTION 4.76a
4.76a Computation of average concentric contraction of visual fields.
§ 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.