Corneal Cap Thickness and Its Effect on Visual Acuity and Corneal Biomechanics in Eyes Undergoing Small Incision Lenticule Extraction

Table 2

Comparison of visual parameters in the early postoperative period. (2 h, 4 h, and 24 h) (mean ± SD).

Time point	Visual parameter	110 cap ()	150 cap ()	value
2 h	UCVA	0.1 ± 0.0	0.50 ± 0.1	<0.001
	Sph (D)	0.78 ± 0.24	0.80 ± 0.42	0.88
	Cyc (D)	0.36 ± 0.16	0.30 ± 0.36	0.41
	SR	0.12 ± 0.04	0.08 ± 0.04	0.01
	OSI	2.71 ± 1.29	3.74 ± 1.43	<0.001
	MTF cutoff (cpd)	19.66 ± 5.61	15.55 ± 3.76	0.01
4 h	UCVA	0.1 ± 0.0	0.3 ± 0.1	<0.001
	Sph (D)	0.64 ± 0.24	0.63 ± 0.42	0.87
	Cyc (D)	0.14 ± 0.13	0.23 ± 0.17	0.05
	SR	0.14 ± 0.05	0.10 ± 0.03	0.01
	OSI	2.17 ± 0.96	2.65 ± 1.35	0.06
	MTF cutoff (cpd)	21.10 ± 6.12	17.15 ± 4.47	0.01
24 h	UCVA	0.1 ± 0.1	0.1 ± 0.1	<0.001
	Sph (D)	0.38 ± 0.30	0.36 ± 0.44	0.91
	Cyc (D)	0.20 ± 0.33	0.22 ± 0.55	0.89
	SR	0.21 ± 0.06	0.17 ± 0.08	0.05
	OSI	1.11 ± 0.95	1.96 ± 1.24	0.01
	MTF cutoff (cpd)	34.51 ± 11.31	24.76 ± 11.02	0.01

Uncorrected visual acuity (UCVA), Strehl ratio (SR), objective scatter index (OSI), and modulation transfer function (MTF) cutoff frequency.