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Table 4 Changes in axial length during the 2-year treatment of subjects with different degrees of myopia between the ortho-k group (65 subjects) and spectacle group (63 subjects)

From: The control effect of orthokeratology on axial length elongation in Chinese children with myopia

  First year Second year 2 years
Low myopia    
Ortho-k 0.19 ± 0.17 0.18 ± 0.14 0.37 ± 0.28
Control 0.40 ± 0.18 0.32 ± 0.19 0.72 ± 0.28
t −3.80 −2.64 −3.97
P 0.001 0.012 <0.001
Moderate myopia    
Ortho-k 0.14 ± 0.18 0.18 ± 0.16 0.32 ± 0.31
Control 0.45 ± 0.22 0.34 ± 0.30 0.79 ± 0.39
t −5.09 −2.24 −4.40
P <0.001 0.030 <0.001
High myopia    
Ortho-k 0.16 ± 0.18 0.18 ± 0.15 0.33 ± 0.30
Control 0.34 ± 0.22 0.27 ± 0.21 0.61 ± 0.36
t −3.05 −1.651 −2.814
P 0.004 0.107 0.007
Total    
Ortho-k 0.16 ± 0.17 0.18 ± 0.15 0.34 ± 0.29
Control 0.39 ± 0.21 0.31 ± 0.24 0.70 ± 0.35
t −6.87 −3.699 −6.408
P <0.001 <0.001 <0.001