Goldmann and modified Goldmann tonometry measuring intraocular pressure changes in eyes which underwent myopic laser in situ Keratomileusis and photorefractive keratectomy

Table 3 IOPc and IOPg reduction following LASIK and PRK procedures including paired (post-operative – pre-operative) IOP measurement changes

Procedural Changes in IOP	LASIK (n = 58)	T-test between groups p=	PRK (n = 62)	T-test between groups p =
IOPg (GAT)
Mean Pre-Op	14.8+/−3.0 (20,7)		14.3+/−2.6 (20,8)
Mean Post-Op	11.5+/−2.0 (18,8)	< 0.0001	12.4+/−3.1 (19,6)	< 0.0001
IOPc (Mod. GAT)
Mean Pre-Op	16.5+/−2.8 (22,10)		14.3+/−2.6 (20,8)
Mean Post Op	12.8+/−2.1 (18,10)	< 0.0001	13.3+/−3.0 (19,6)	< 0.0001
Paired Procedural IOP Change
IOPg (Post-Pre)	(−)3.27+/−3.2 (4,-10)		(−)1.92+/−3.6 (7,-10)
IOPc (Post-Pre)	(−)1.93+/−3.3 (8,-8)	< 0.0001	(−)1.06+/− 3.6 (7,-8)	< 0.0001

IOPc and IOPg Reduction with Ablation Depth and CCT Reduction. Correlations to the measured parameters following LASIK and PRK were not statistically significant (Tables 4 and 5). It should be noted, however, that increased ablation depth and decreased CCT trended toward lower post-operative IOP measured with IOPc and IOPg (Fig. 2). The GAT reduction in IOP following LASIK was nearly significant following LASIK (−)0.24 mmHg/μm (p = 0.07)

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