Multifocal Electroretinography in Assessment of Macular Function after Internal Limiting Membrane Peeling in Macular Hole Surgery

Table 2

Visual acuity and amplitude of P1 and N1 by photoreceptor status before and after surgery.

Parameter	Before surgery ()	After surgery ()	value
Intact photoreceptor
Visual acuity (logMAR)	2.10 (2.90)	0.70 (4.80)	0.007
P1 amplitude (nV/deg^2)
Ring 1	37.70 (77.20)	59.00 (92.60)	<0.001
Ring 2	51.50 (39.70)	67.30 (97.30)	0.231
N1 amplitude (nV/deg^2)
Ring 1	31.40 (120.80)	67.90 (117.80)	<0.001
Ring 2	20.30 (30.80)	24.80 (47.40)	0.571
Disrupted photoreceptor
Visual acuity (logMAR)	1.80 (1.60)	1.10 (2.00)	0.008
P1 amplitude (nV/deg^2)
Ring 1	35.65 (48.10)	60.80 (82.20)	0.001
Ring 2	35.15 (62.30)	45.85 (80.20)	0.084
N1 amplitude (nV/deg^2)
Ring 1	23.35 (127.30)	31.65 (155.30)	0.001
Ring 2	21.30 (85.80)	21.50 (40.20)	0.861

Amplitude of P1 and N1 are expressed in nanovoltage (nV)/area degree² (deg²). All values are expressed as median (range). values are obtained from the Wilcoxon signed-rank test.