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

Table 2

Comparison of locational correlation with retinal nerve fiber layer defect between β zone and γ-zone parapapillary atrophy group.

	β-zone group (49 eyes)	γ-zone group (40 eyes)	value
Angular extent of RNFL defect (°)	29.88 ± 11.65	30.14 ± 12.44	0.920
Location of RNFL defect, n (%)			0.071^†
Superior	12 (24.5)	17 (42.5)
Inferior	37 (75.5)	23 (57.5)
Angular location of RNFL defect (°)	−24.77 ± 52.26	−7.37 ± 64.38	0.172
Angular location of PMRE (°)	−15.86 ± 38.38	−4.44 ± 10.06	0.050
Width of PPA on PMRE (μm)	412.02 ± 125.85	603.83 ± 257.81	<0.001
The angular distance between the RNFL defect and PMRE (°)	26.49 ± 17.27	60.31 ± 17.12	<0.001

RNFL = retinal nerve fiber layer, PMRE = point of maximum radial extent on the parapapillary atrophy margin, PPA = parapapillary atrophy. Data are presented as mean ± standard deviation. Comparison performed using independent t-test. ^†Comparison performed using chi-square test.