Comparison of Intraocular Pressure before and after Laser In Situ Keratomileusis Refractive Surgery Measured with Perkins Tonometry, Noncontact Tonometry, and Transpalpebral Tonometry

Table 2

Intraocular pressure readings with Perkins, air and Diaton tonometers, and central and superior pachymetries before and after LASIK.

Parameter	Presurgery	Postsurgery	Presurgery − postsurgery	value
IOP Perkins (mmHg); (mean (SD))	14.02 ± 2.25	11.85 ± 2.08	2.16 ± 2.47
IOP air tonometry (mmHg); (mean (SD))	14.92 ± 2.98	10.86 ± 1.71	4.05 ± 2.72
IOP Diaton (mmHg); (mean (SD))	14.18 ± 2.70	14.38 ± 3.50	−0.20 ± 2.73	0.590
Central pachymetry (µm); (mean (SD))	572.59 ± 45.41	475.91 ± 55.95	96.67 ± 44.83
Superior pachymetry (µm); (mean (SD))	658.62 ± 31.69	645.18 ± 29.41	13.44 ± 29.30	0.080

Presurgery versus postsurgery. . Student’s paired -test.