A field is reviewed by masked, certified readers at the VFRC and considered abnormal if the PSD index is outside the normal 5% level or if the Glaucoma Hemifield Test (GHT) is ‘outside normal limits.’An abnormal visual field is defined as having a GHT ‘outside normal limits’ and/or a Pattern Standard Deviation (PSD) worse than the normal 5th percentile (p < 0.05).
Nasal Step
MILD SEVERE
Limited field loss adjacent to the nasal horizontal meridian with at least one abnormal point (p < 5%) at or outside 15 degrees on the meridian. Cannot include more than two significant points (on either plot) in the nerve fiber bundle region on the temporal side.
Partial Arcuate
MILD SEVERE
Visual field loss in the nerve fiber bundle region that extends incompletely from the blind spot to the nasal meridian. The defect is generally contiguous with either the blind spot or the nasal meridian and must include at least one abnormal location in the temporal visual field.
Arcuate
MILD SEVERE
Significant visual field loss in the nerve fiber bundle region, extending across contiguous abnormal points from the blind spot to at least one point outside 15 degrees adjacent to the nasal meridian.
Paracentral
A relatively small visual field abnormality (a cluster or a single point) in the nerve fiber bundle region that is generally not contiguous with the blind spot or the nasal meridian. In particular, it does not involve points outside 15 degrees that are adjacent to the nasal meridian.
Temporal Wedge
A small visual field defect that is temporal to the blind spot.