Changes in Corneal Volume at Different Areas and Its Correlation with Corneal Biomechanics after SMILE and FS-LASIK Surgery

Table 3

Correlation between the reduction of corneal volume and spherical equivalent with the change in corneal hysteresis and corneal resistance factor at 3 months.

Parameters	SMILE		FS-LASIK
	r	value	r	value
△CV5 VS △CRF	0.498	<0.001	0.363	0.012
△CV5-10 VS△CRF	0.270	0.058	0.125	0.403
△CV5 VS △CH	0.374	0.007	0.264	0.073
△CV5-10 VS △CH	0.116	0.420	0.098	0.512
△CV5 VS △SE	−0.746	<0.001	^−0.798	<0.001
△CV5-10 VS △SE	^−0.353	0.012	^−0.440	0.002
△SE VS △CRF	^−0.559	<0.001	^−0.598	<0.001
△SE VS △CH	^−0.506	<0.001	^−0.472	0.001

CRF: corneal resistance factor，CH: corneal hysteresis, CV5: corneal volume of the central 5 mm diameter area, CV5-10: corneal volume of the peripheral 5–10 mm diameter area, SE: spherical equivalent, △: the reduction at postoperative month 3, (Pearson correlation).