Increased Corneal Toricity after Long-Term Orthokeratology Lens Wear

Table 1

Comparison of refractive error and corneal curvature between the ortho-k and control group.

	OK ()		SVL ()		value
	Mean	SD	Mean	SD
Pretreatment age	9.1	1.5	9.4	1.8	0.149
Pretreatment sphere	−2.53	1.07	−2.37	1.52	0.336
Pretreatment cylinder	−0.31	0.40	−0.45	0.58	0.024
Pretreatment FK	42.84	0.98	42.84	1.34	0.970
Pretreatment SK	44.00	1.17	44.11	1.57	0.494
Pretreatment toricity	1.16	0.41	1.28	0.57	0.047
Posttreatment FK	42.62	1.01	42.74	1.35	0.430
Posttreatment SK	44.06	1.12	44.14	1.58	0.645
Posttreatment toricity	1.44	0.44	1.40	0.61	0.556
Change in toricity	0.28	0.43	0.12	0.38	0.001