Changes and Diurnal Variation of Visual Quality after Orthokeratology in Myopic Children

Table 2

Effects of orthokeratology on refraction and corneal curvature (, mean ± SD).

Time	Sphere (D)	Cylinder (D)	K1 (D)	K2 (D)
AM baseline	−3.83 ± 0.97	−0.47 ± 0.43	42.05 ± 1.26	43.19 ± 1.37
AM 1 month	−1.03 ± 0.85	−0.69 ± 0.57	39.75 ± 0.97	40.64 ± 1.27
PM 1 month	−1.10 ± 0.68	−0.66 ± 0.52	40.02 ± 1.05	40.95 ± 1.27
P1	<0.001	0.155	<0.001	<0.001
P2	0.568	0.500	<0.001	<0.001

Paired t-test. P1: comparison between AM baseline and AM 1 month after orthokeratology; P2: comparison between AM and PM during the same day 1 month after orthokeratology; K1: flat keratometric value; K2: steep keratometric value.