Table 2.

Mean number of drops per bottle and force for each medication in the vertical and horizontal axis.

Medication	Vertical			Horizontal
	mean # drops	force (kgf)		mean # drops	force (kgf)
		mean (SD)	range		mean (SD)	range
Xalatan 2.5mL	90	0.9 (0.05)	0.36–1.36	75	1.06 (0.20)	0.71–1.38
Latanoprost 2.5mL	70	1.50 (0.23)	1.13–1.78	65	1.36 (0.20)	0.96–1.85
Travatan Z 2.5mL	75	1.65 (0.37)	1.04–2.47	100	1.77 (0.37)	1.21–3.32
Travaprost 2.5mL	70	1.59 (0.36)	0.98–2.17	65	1.75 (0.26)	1.23–2.11
Lumigan 2.5mL	95	1.47 (0.33)	0.95–2.78	70	1.62 (0.30)	1.16–2.85
Travatan Z 5mL	150	1.14 (0.15)	0.85–1.44	190	1.63 (0.64)	0.86–4.29
Travaprost 5mL	145	1.13 (0.17)	0.84–1.38	145	1.27 (0.31)	0.87–2.47
Lumigan 5mL	195	0.67 (0.11)	0.47–0.91	155	0.91 (0.19)	0.65–1.81
Timolol 5mL	160	1.78 (0.4)	1.18–2.49	150	1.63 (.07)	1.02–2.3
Timoptic 5mL	210	1.81 (0.63)	0.77–3.38	145	2.33 (2.78)	1.01–12.78
Combigan 5mL	165	0.92 (0.35)	0.59–1.89	145	1.05 (0.21)	0.71–1.78
Lumigan 7.5mL	295	0.69 (0.12)	0.51–1.25	230	0.88 (0.23)	0.6–2.03
Simbrinza 8mL	195	0.97 (0.10)	0.77–1.16	210	1.31 (0.12)	1.08–1.87
Alphagan P 10mL	215	1.16 (0.10)	0.95–1.41	225	1.31 (0.20)	0.93–1.73
Brimonidine 10mL	310	0.88 (0.15)	0.68–1.4	275	1.03 (0.16)	0.7–1.38
Combigan 10mL	290	0.8 (0.10)	0.62–0.97	310	0.81 (0.22)	0.53–1.59
Cosopt 10mL	320	4.49 (1.48)	1.77–9.71	225	2.53 (1.40)	1.28–9.55
Dorz-Timolol 10mL	325	1.25 (0.19)	0.8–1.81	295	0.97 (0.13)	0.75–1.31
Azopt 10mL	290	1.51 (0.19)	1.19–2.02	295	1.45 (0.37)	0.97–2.26
Trusopt 10mL	325	3.30 (0.96)	1.34–5.34	215	3.00 (1.16)	1.54–6.77
Dorzolamide 10mL	325	1.09 (0.15)	0.78–1.39	310	0.93 (0.14)	0.58–1.43

kgf = kilograms of force; SD = standard deviation; mL = milliliters.