Table 4.

Vertical cup-to-disc ratio change from baseline

	Month 1	Month 3	Month 6	Month 9	Month 12
Two iStents (N=94)
N	92	91	92	93	93
Better (decrease >0.2)	2 (2%)	0 (0%)	0 (0%)	1 (1%)	0 (0%)
No change (change within ±0.2)	89 (97%)	89 (98%)	91 (99%)	89 (96%)	90 (97%)
Worse (increase >0.2)	0 (0%)	1 (1%)	1 (1%)	2 (2%)	1 (1%)
N (missing)	0	2	0	0	0
Two medications (N=98)
N	94	93	92	91	89
Better (decrease >0.2)	1 (1%)	0 (0%)	2 (2%)	0 (0%)	1 (1%)
No change (change within ±0.2)	92 (98%)	92 (99%)	90 (98%)	91 (100%)	88 (99%)
Worse (increase >0.2)	0 (0%)	0 (0%)	0 (0%)	0 (0%)	0 (0%)
N (missing)	1	1	0	0	1