Intraocular pressure after myopic laser refractive surgery measured with a new Goldmann convex prism: correlations with GAT and ORA

Table 3 Mean differences for IOP measurements in pre-surgery with GAT and at 3 and 12 months after surgery with GAT, CT and IOPcc

	IOP difference	GAT3M - GATpre	GAT12M - GATpre	CT3M - GATpre	CT12M - GATpre	CT3M -IOPcc3M	CT12M -IOPcc12M
All	md (bias)	−3.80	−2.43	−0.0333	0.533	2.70	3.27
All	Wilcoxon test	Z = -4.747;p < 0.000	Z = -3904;p < 0.000	Z = -0.361;p = 0.718	Z = -0.888;p = 0.375	Z = -3.754;p < 0.000	Z = -4.618;p < 0.000
LASIK GV	md (bias)	−4.52	−2.74	−1.11	0.158	2.04	2.91
LASIK GV	Wilcoxon test	Z = -3.836;p < 0.000	Z = -3.209;p < 0.001	Z = -2.017; p = 0.440	Z = -0.776;p = 0.438	Z = -2.636; p = 0.008	Z = -3.582;p < 0.000
PRK	md (bias)	−2.54	−1.91	1.82	1.18	3.83	3.89
PRK	Wilcoxon test	Z = -2.185;p < 0.005	Z = -2.203;p = 0.028	Z = -1.616;p = 0.106	Z = -6.55;p = 0.512	Z = -2.667;p = 0.008	Z = -2.936;p = 0.03

Mean differences between GATpre, GAT, IOPcc and CT after surgery (at 3 and 12 months) were calculated and tested for the absence of differences using the Wilcoxon test. Significant differences are marked in bold. md, mean difference; Z, Wilcoxon test; p, probability value
GAT Goldmann applanation tonometer, CT Convex tonometer, IOPg Goldmann-correlated IOP, IOPcc Corneal-compensated IOP, M Months

ISSN: 1471-2415