Table 2. Optical quality parameters in eyes undergoing implantable collamer lens (ICL) implantation with and without a central artificial hole.

	Hole ICL group	Conventional ICL group	P value
MTF cutoff frequency (cpd)	26.21±8.32 cpd (95%CI, 9.91 to 42.52 cpd)	27.58±9.11 cpd (95%CI, 9.73 to 45.42 cpd)	0.59
Strehl ratio	0.16±0.04 (95%CI, 0.08 to 0.25)	0.17±0.05 (95%CI, 0.07 to 0.26)	0.82
OSI	1.16±0.57 (95%CI, 0.40 to 2.48)	1.18±0.53 (95%CI, 0.14 to 2.23)	0.63
OV100%	0.87±0.28 (95%CI, 0.33 to 1.41)	0.92±0.30 (95%CI, 0.32 to 1.51)	0.58
OV20%	0.80±0.35 (95%CI, 0.12 to 1.48)	0.84±0.30 (95%CI, 0.25 to 1.43)	0.40
OV9%	0.80±0.33 (95%CI, 0.15 to 1.45)	0.80±0.29 (95%CI, 0.23 to 1.36)	0.87

ICL = implantable collamer lens, MTF = modulation transfer function, cpd = cycles/degree, CI =  confidence interval, OSI = objective scattering index, OV = optical quality analysis system value.