Table 3 The amplitude and latency before, during, and after scleral indentation (SI) with IOP control setting.

		a-wave		b-wave	p value^#	on-PhNR	p value^#	d-wave	p value^#	off-PhNR	p value^#
Amplitude (uV)
before SI	mean ± SD	2.71 ± 0.84		6.79 ± 1.85		2.50 ± 1.20		3.14 ± 0.99		3.28 ± 0.84
(baseline)	range	1.5~4.0		3.5~9.0		1.0~4.5		2.0~5.0		2.0~4.5
during SI	mean ± SD	2.43 ± 0.68	0.356	6.43 ± 1.76	0.182	1.93 ± 0.82	0.030*	3.21 ± 0.88	0.788	2.93 ± 0.94	0.094
during SI	range	1.5~3.5	0.356	4.0~9.0	0.182	1.0~3.5	0.030*	2.0~4.5	0.788	1.0~4.0	0.094
after SI	mean ± SD	2.93 ± 1.18	0.589	7.64 ± 2.49	0.053	2.00 ± 1.10	0.086	4.57 ± 3.16	0.245	4.64 ± 3.21	0.278
after SI	range	1.5~4.5	0.589	4.0~11.0	0.053	1.0~4.5	0.086	2.0~12.0	0.245	2.0~12.0	0.278
Latency (msec)
before SI	mean ± SD	26.43 ± 3.50		43.57 ± 3.50		64.29 ± 4.16		27.86 ± 2.47		46.86 ± 2.16
(baseline)	range	20.0~30.0		40.0~50.0		60.0~70.0		25.0~30.0		45.0~50.0
during SI	mean ± SD	25.71 ± 4.16	0.356	43.57 ± 3.50	1	64.29 ± 4.16	1	27.86 ± 2.47	1	46.86 ± 2.16	1
during SI	range	20.0~30.0	0.356	40.0~50.0	1	60.0~70.0	1	25.0~30.0	1	45.0~50.0	1
after SI	mean ± SD	25.00 ± 3.78	0.172	43.57 ± 3.50	1	64.29 ± 4.16	1	27.86 ± 2.47	1	46.86 ± 2.16	1
after SI	range	20.0~30.0	0.172	40.0~50.0	1	60.0~70.0	1	25.0~30.0	1	45.0~50.0	1

IOP: intraocular pressure, PhNR: photopic negative response, SD: standard deviation.
^#Statistical comparison by paired t-test compared to baseline, *significant difference compared to baseline (p < 0.05).

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