Table 2. Number of cases for which either the anterior lamina cribrosa insertion distance (ALID) or the marginal anterior laminar cribrosa depth (mALCSD) was not measurable in each meridian.

Clock hour	ALID			mALCSD
	POAG (N = 50)	Control (N = 50)	p	POAG (N = 50)	Control (N = 50)	p
3	12	10	0.629*	2	1	1.000†
4	4	3	1.000†	1	0	1.000†
5	6	4	0.741†	0	1	1.000†
6	3	1	0.617†	0	0
6.5	0	0		0	0
7	0	0		0	0
8	0	0		0	0
9	0	0		0	0
10	1	2	1.000†	0	0
11	5	3	0.715†	0	1	1.000†
11.5	7	3	0.318†	0	0
12	9	4	0.234†	1	1	1.000†
1	20	15	0.295*	2	1	1.000†
2	17	14	0.517*	1	2	1.000†

^* p values were calculated by the Chi-square test.

^† p values were calculated by the Fisher's exact test.

ALID  =  anterior lamina cribrosa insertion distance; mALCSD  =  marginal anterior lamina cribrosa surface depth; POAG  =  primary open angle glaucoma.