The Effect of Altitude on Intraocular Pressure in Vitrectomized Eyes with Sulfur Hexafluoride Tamponade by the Friedenwald Method: Rabbit Animal Model

Table 2

IOP at different altitudes and different measurement methods.

Altitude	SF6 100% Tonopen	SF6 100% Schiotz	SF6 50% Tonopen	SF6 50% Schiotz	SF6 25% Tonopen	SF6 25% Schiotz	Air 100% Tonopen	Air 100% Schiotz	Pneum Tonopen	Pneum Schiotz	BSS; Tonopen	BSS; Schiotz
2260	16	17	12	12	15	16	16	17	14	14	14	14
2410	19	22	12	12	20	21	20	21	13	13	11	11
2740	27	26	22	22	25	26	25	26	12	12	12	13
3093	31	30	24	24	26	26	25	26	15	16	12	13
3198	32	32	23	24	27	28	26	26	18	17	15	14
3090	26	26	18	20	26	26	27	28	17	17	14	14
2740	18	17	16	17	25	26	22	22	18	18	17	17
2420	18	17	16	17	21	22	20	22	18	18	19	18
2260	17	17	14	13	20	20	18	18	17	17	14	13
	0.441		0.593		0.55		0.6		0.574		0.953
	0.979/0.958		0.982/0.964		0.987/0.974		0.977/0.954		0.979/0.958		0.962/0.925

Differences in intraocular pressure among all study eyes, according to its particular measuring method and change in altitude. IOP: intraocular pressure. SF₆: sulfur hexafluoride. BSS: balanced saline solution. Pneum: rabbit eye without vitrectomy and 0.35 cc of 100% pure SF₆. : Wilcoxon signed rank test. : Pearson’s coefficient of correlation/coefficient of determination.