10-2 Visual Field - III, red stimulus; Interpreting the Normal Field

This 10-2 visual field (VF) was done with the III, red stimulus using the FASTPAC protocol. The field is normal, and illustrates several points to consider in interpreting such VFs. The test took 6 minutes, 47 seconds (red arrow). The gray scale commonly shows dark areas particularly near the edge of the visual field that are not worrisome, because the thresholds at the involved locations, as shown from the defect depth display, all lie within 4 db of the expected thresholds for age-matched normal subjects. In the defect depth display, there is only one location with an abnormal threshold ( red-circled locus). At this location the threshold was 16 db (green-circled locus), which can be seen to be a higher threshold (reduced sensitivity) compared to its neighboring loci, which range from 19-23 db. Note the inexact congruence of the grayscale and defect depth display. For example, on the grayscale display there appears to be a relative scotoma at the green arrow, but the defect depth display shows that the threshold at this location lies within 4 db of normal as represented by the 0 at the location (blue-circled location).