The Topographical Effect of Optical Zone Diameter in Orthokeratology Contact Lenses in High Myopes

Table 5

Corneal and total spherical aberration measured with Visionix VX110 at 5 mm pupil diameter.

	Corneal Z12 (µm)			Total Z12 (µm)
Visit	5 mm OZ lens	6 mm OZ lens	p value	5 mm OZ lens	6 mm OZ lens	value
PRE	0.144 ± 0.030	0.132 ± 0.029	0.854	0.041 ± 0.054	0.011 ± 0.029	0.456
1 day	0.403 ± 0.083	0.331 ± 0.089	0.526	—	—	—
7 days	0.644 ± 0.101	0.477 ± 0.153	0.027	—	—	—
15 days	0.603 ± 0.116	0.476 ± 0.124	0.039	0.574 ± 0.496	0.451 ± 0.199	0.043

Values are expressed as mean ± SD. SD: standard deviation; OZ: optical zone; Z12: 4^th spherical aberration.  < 0.05 comparison between lenses (Student's t-test for paired samples).