Journal of Ophthalmology

Research Article

Changes in Intraocular Pressure after Transepithelial Photorefractive Keratectomy and Femtosecond Laser In Situ Keratomileusis

Table 1

Patients’ demographic data, refractive status, and corneal biomechanical properties.


	FS-LASIK (n = 93)	TPRK (n = 104)	value†

Gender, %			0.409
Male	31 (33.3%)	28 (26.9%)
Female	62 (66.7%)	76 (73.1%)
Age (year)	32.00 (25.00, 37.00)	32.50 (26.00, 40.00)	0.549
SE (D)	−5.75 (−6.81, −4.50)	−5.49 (−7.00, −3.87)	0.768
Average K (D)	43.50 (42.61, 44.87)	43.56 (42.77, 44.48)	0.943
Depth of ablation (μm)	68.00 (53.00, 84.50)	47.50 (25.50, 66.75)	<0.001
IOP (mmHg)	14.50 (13.50, 16.00)	13.50 (12.50, 14.50)	<0.001
bIOP (mmHg)	14.60 (13.65, 15.70)	13.95 (12.90, 15.18)	<0.004
CCT (μm)	530 (518, 557)	513 (502, 532)	<0.001
A1L (mm)	2.29 (1.89, 2.53)	1.91 (1.86, 2.13)	<0.001
A1V (m/s)	0.15 (0.14, 0.16)	0.16 (0.15, 0.17)	<0.001
A2L (mm)	1.96 (1.80, 2.05)	1.87 (1.49, 2.02)	<0.004
A2V (m/s)	−0.28 (−0.29, −0.26)	−0.30 (−0.31, −0.28)	<0.001
A1T (ms)	7.43 (7.29, 7.62)	7.12 (7.01, 7.27)	<0.001
A2T (ms)	21.95 (21.78, 22.11)	22.06 (21.82, 22.32)	0.013
Radius (mm)	7.11 (6.69, 7.71)	6.72 (6.41, 7.24)	<0.001
PD (mm)	5.11 (4.98, 5.25)	5.22 (5.01, 5.40)	<0.001
DA (mm)	1.07 (1.01, 1.11)	1.14 (1.07, 1.21)	<0.001
Young’s modulus (MPa)	0.45 (0.38, 0.56)	0.64 (0.46, 0.89)	<0.001
CBI	0.30 (0.05, 0.74)	0.78 (0.44, 0.96)	<0.001
DA ratio	4.70 (4.40, 5.05)	5.10 (4.90, 5.50)	<0.001
Integrated radius (mm⁻¹)	8.50 (7.70, 9.20)	9.10 (8.70, 9.70)	<0.001
ARTh	421.30 (366.80, 469.65)	385.85 (343.28, 445.25)	<0.011
SP-A1	93.90 (83.85, 101.55)	82.90 (76.60, 88.98)	<0.001

Mann–Whitney U test, median (interquartile range). and . FS-LASIK, femtosecond laser in situ keratomileusis; TPRK, transepithelial photorefractive keratectomy; SE, spherical equivalent; K, keratometric readings in diopter; IOP, intraocular pressure; bIOP, biomechanically corrected IOP; A1L, first applanation length; A1V, applanation-1 velocity; A2L, second applanation length; A2V, applanation-2 velocity; PD, peak distance; DA, deformation amplitude; CCT, central corneal thickness; A1T, applanation-1 time; A2T, applanation-2 time; CBI, Corvis Biomechanical Index; DA ratio, DA ratio at 2.0 mm; Integrated radius, the integrated area under the radius of the inversed curvature during the concave phase; ARTh, Ambrósio’s relational thickness in the horizontal profile; SP-A1, stiffness parameter at applanation 1. † LASIK vs PR.