Visual rehabilitation in moderate keratoconus: combined corneal wavefront-guided transepithelial photorefractive keratectomy and high-fluence accelerated corneal collagen cross-linking after intracorneal ring segment implantation

Table 5 Preoperative and postoperative corneal biomechanical properties in eyes undergoing combined corneal wavefront-guided transepithelial photorefractive keratectomy and accelerated corneal collagen cross-linking after intracorneal ring segment implantation in patients with moderate keratoconus

	Preop (Baseline, before ICRS)	Before tPRK-CXL	P ^a	1 mon after tPRK-CXL	3 mon after tPRK-CXL	P ^b	6 mon after tPRK-CXL	P ^c	P ^d	P ^e	P ^f
Radius (mm)	5.33 ± 0.98 (3.56 to 8.05)	4.89 ± 0.71 (3.89 to 6.52)	.042	4.34 ± 0.54 (2.98 to 5.10)	4.51 ± 0.65 (3.00 to 5.60)	.093	4.78 ± 0.67 (3.09 to 5.85)	< .001	.023	.012	.999
DA (mm)	1.09 ± 0.13 (0.89 to 1.43)	1.07 ± 0.11 (0.88 to 1.36)	.938	1.08 ± 0.11 (0.91 to 1.39)	1.03 ± 0.10 (0.91 to 1.35)	.014	1.01 ± 0.11 (0.86 to 1.36)	.008	.844	.012	.042
MCP (1/mm)	0.19 ± 0.03 (0.12 to 0.28)	0.21 ± 0.03 (0.15 to 0.26)	.047	0.23 ± 0.03 (0.20 to 0.34)	0.23 ± 0.04 (0.18 to 0.33)	.371	0.21 ± 0.03 (0.17 to 0.32)	< .001	.034	.005	.999

Results are expressed as means ± standard deviation (range)
Preop preoperative, ICRS intracorneal ring segment implantation, tPRK-CXL corneal wavefront-guided transepithelial photorefractive keratectomy and corneal collagen cross-linking, DA deformation amplitude, MCP maximal concave power
^a P value between baseline and before tPRK-CXL
^b P value between 1 month and 3 months after tPRK-CXL
^c P value between 1 month and 6 months after tPRK-CXL
^d P value between 3 months and 6 months after tPRK-CXL
^e P value between baseline and 6 months after tPRK-CXL
^f P value between before tPRK-CXL and 6 months after tPRK-CXL

ISSN: 1471-2415