[Code of Federal Regulations]
[Title 38, Volume 1]
[Revised as of January 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 38CFR4.76a]

[Page 406-409]
 
            TITLE 38--PENSIONS, BONUSES, AND VETERANS' RELIEF
 
                CHAPTER I--DEPARTMENT OF VETERANS AFFAIRS
 
PART 4_SCHEDULE FOR RATING DISABILITIES--Table of Contents
 
                      Subpart B_Disability Ratings
 
Sec. 4.76a  Computation of average concentric contraction of 

visual fields.

    The extent of contraction of visual field in each eye is determined 
by recording the extent of the remaining visual fields in each of the 
eight 45 degree principal meridians. The number

[[Page 407]]

of degrees lost is determined at each meridian by subtracting the 
remaining degrees from the normal visual fields given in table III. The 
degrees lost are then added together to determine total degrees lost. 
This is subtracted from 500. The difference represents the total 
remaining degrees of visual field. The difference divided by eight 
represents the average contraction for rating purposes.

     Table III--Normal Visual Field Extent at 8 Principal Meridians
------------------------------------------------------------------------
                                                                Normal
                          Meridian                              degrees
------------------------------------------------------------------------
Temporally..................................................          85
Down temporally.............................................          85
Down........................................................          65
Down nasally................................................          50
Nasally.....................................................          60
Up nasally..................................................          55
Up..........................................................          45
Up temporally...............................................          55
                                                             -----------
 Total......................................................         500
------------------------------------------------------------------------


[[Page 408]]

[GRAPHIC] [TIFF OMITTED] TC04NO91.005

    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

[[Page 409]]

 
Down nasally................................................          30
Nasally.....................................................          40
Up nasally..................................................          35
Up..........................................................          25
Up temporally...............................................          35
                                                             -----------
 Total loss.................................................         320
------------------------------------------------------------------------
Remaining field 500[deg] minus 320[deg] = 180[deg]. 180[deg] / 8 = 22\1/
  2\[deg] average concentric contraction.


[43 FR 45352, Oct. 2, 1978]