Topographic Relationship with a Retinal Nerve Fiber Layer Defect Differs between β-Zone and γ-Zone Parapapillary Atrophy

Figure 7

Cases showing the presence of inferior retinal nerve fiber layer (RNFL) defect at the edge of parapapillary atrophy (PPA) in eyes with γ-zone PPA. Color disc photographs are in the left. Arrows indicate the location of inferior PPA edge. Red-free photographs are in the right. Note that the optic disc is considerably torted inferiorly in (b). The angle between the fovea-disc center axis (yellow line) and the line drawn from the center of the disc to the midpoint of the RNFL defect (red line) is considerably different between the two eyes. Note that the angular distance of the inferiorly located RNFL defect is greater in B which had greater inferior torsion than (a).