Table 1.

Demographics of preoperative parameters

Parameter	ICL V4	ICL V4c	P value
N, eyes	38	39
Age, years	28.66 ± 7.53(20 ~ 45)	28.69 ± 6.44(20 ~ 45)	0.98
UDVA (Snellen lines)	0.06 ± 0.04(0.01 ~ 0.15)	0.07 ± 0.06(0.01 ~ 0.15)	0.29
CDVA (Snellen lines)	0.94 ± 0.17(0.50 ~ 1.20)	0.97 ± 0.15(0.7 ~ 1.20)	0.39
Refractive errors (D)
Spherical	−11.97 ± 3.46(−5.25 ~ −20.50)	−11.72 ± 3.58(−7.25 ~ −20.25)	0.76
Cylindrical	−1.34 ± 1.02(0 ~ −4.75)	−1.47 ± 1.10(−0.25 ~ −5.00)	0.59
Spherical equivalent	−12.64 ± 3.60(−5.75 ~ −21.38)	−12.46 ± 3.67(−7.75 ~ −22.00)	0.83
Keratometric value (D)
Flat K	43.39 ± 1.73(38.3 ~ 46.7)	43.12 ± 1.74(39.4 ~ 46.7)	0.51
Steep K	44.60 ± 2.03(38.7 ~ 49.2)	44.52 ± 1.87(41.2 ~ 49.0)	0.86
STS (mm)
Vertical	12.36 ± 0.43(11.54 ~ 13.33)	12.36 ± 0.68(10.67 ~ 13.75)	0.98
Horizontal	11.76 ± 0.37(11.12 ~ 12.64)	11.81 ± 0.62(10.31 ~ 13.39)	0.68
IOP (mm Hg)	14.08 ± 2.38(8.8 ~ 19.1)	15.20 ± 2.70(9.9 ~ 20.1)	0.57
Axial length (mm)	28.24 ± 1.78(25.01 ~ 31.49)	28.24 ± 1.78(25.42 ~ 32.19)	0.99
WTW diameter (mm)	11.77 ± 0.34(11.2 ~ 12.5)	11.85 ± 0.49(10.7 ~ 12.7)	0.39
ACD (mm)	3.21 ± 0.23(2.83 ~ 3.70)	3.18 ± 0.19(2.87 ~ 3.70)	0.86
CCT (mm)	521.08 ± 35.70(467 ~ 603)	515.51 ± 22.26(469 ~ 572)	0.12
ECD (cells/mm2)	3254.18 ± 366.74(2331 ~ 3951)	3270.18 ± 351.21(2374 ~ 4258)	0.85
Pupil size (mm)	3.38 ± 0.74(2.09 ~ 4.48)	3.14 ± 0.60(2.14 ~ 4.42)	0.52
ICL size (mm)	12.36 ± 3.84(11.5 ~ 13.0)	12.97 ± 0.47(12.1 ~ 13.7)
ICL power (D)	−15.16 ± 7.22(−8.50 ~ −23.00)	−12.62 ± 2.92(−8.50 ~ −18.00)

Results are expressed as means ± standard deviation (range)

N number of eyes, UDVA uncorrected distance visual acuity, CDVA corrected distance visual acuity, D diopters, K keratometry, STS sulcus to sulcus, IOP intraocular pressure, WTW horizontal white-to-white diameter, ACD anterior chamber depth, CCT central corneal thickness, ECD corneal endothelial cell density, ICL implantable collamer lens