Table 2 Changes in SER, UCVA, AL and topographic map parameters after orthokeratology treatment

SER at 1 month (D)

0.04 ± 0.57

0.05 ± 0.45

 − 0.110

0.913

UCVA at 1 month (logMAR)

0.00 ± 0.01

0.02 ± 0.12

 − 0.974

0.332

AL changes at 6 months (mm)

0.01 ± 0.09

0.05 ± 0.09

 − 2.266

0.025*

AL changes at 12 months (mm)

0.07 ± 0.11

0.14 ± 0.12

 − 3.291

0.001*

AL changes at 18 months (mm)

0.17 ± 0.15

0.26 ± 0.16

 − 3.407

0.001*

Changes in HOA (μm)

0.90 ± 0.43

0.71 ± 0.47

2.292

0.024*

Changes in total SA (μm)

0.37 ± 0.25

0.25 ± 0.29

2.477

0.015*

TZ diameter (mm)

2.50 ± 0.23

2.77 ± 0.18

 − 7.529

 < 0.001*

TZ area (mm²)

4.94 ± 0.89

6.05 ± 0.82

 − 7.425

 < 0.001*

Defocus ring width (mm)

2.45 ± 0.28

2.30 ± 0.30

2.814

0.006*

Total amount of defocus (D·mm²)

119.38 ± 63.71

91.40 ± 40.83

3.015

0.003*

Distance of decentration (mm)

0.41 ± 0.16

0.41 ± 0.16

0.096

0.923