Table 1. Anterior segment parameter changes after collagen cross-linking therapy measured by pentacam HR.

Anterior segment parameter		Preoperative	Postoperative	P
Rh front (mm)		7.15±0.73	7.35±0.93	0.48
Rv front (mm)		6.78±0.76	6.86±0.78	0.62
Rh back (mm)		5.77±0.77	5.66±1.02	0.55
Rv back (mm)		5.53±0.92	5.41±0.95	0.66
RMS HOA front (µm)		2.22±1.63	2.04±1.46	0.65
RMS HOA back (µm)		0.43±0.22	0.42±0.24	0.33
RMS HOA cornea (µm)		1.87±1.5	1.68±1.28	0.77
RMS LOA front (µm)		15.31±8.52	14.25±7.86	0.66
RMS LOA back (µm)		3.34±1.51	3.4±1.5	0.32
RMS LOA cornea (µm)		12.14±7.09	11.02±6.4	0.9
CCT (µm)		441.7±67	444.3±56	0.7
anterior corneal elevation	zone 3.0 mm	9.03±3.2	10.62±3.1	0.68
	zone 4.0 mm	3.48±2.5	5.33±1.2	0.53
	zone 5.0 mm	-1.61±0.9	0.3±0.25	0.35
	zone 6.0 mm	-5.34±1.2	-3.66±1.14	0.27
posterior corneal elevation	zone 3.0 mm	19.34±5.6	23.57±3.9	0.51
	zone 4.0 mm	6.97±3.6	10.3±2.9	0.45
	zone 5.0 mm	-3.7±1.1	-0.9±0.15	0.42
	zone 6.0 mm	-10.9±1.5	-8.28±2.32	0.45

Rh: Horizontal radius of cornea; Rv: Vertical radius of cornea; RMS: Root mean square; HOA: Higher order aberration; LOA: Lower order aberration; CCT: Central corneal thickness.