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Table 3 Mean (±SD) spherical equivalent refractive error and axial length in different degree of myopia for the ortho-k and spectacle groups during the study period

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

  1 year 2 year
Axial length   
Low myopia   
Ortho-k 24.48 ± 0.75 24.67 ± 0.74
Control 24.36 ± 0.88 24.69 ± 0.81
Moderate myopia   
Ortho-k 24.92 ± 0.35 25.11 ± 0.37
Control 25.19 ± 0.79 25.53 ± 0.76
High myopia   
Ortho-k 25.77 ± 0.78 25.95 ± 0.89
Control 26.11 ± 0.70 26.38 ± 0.70
Total   
Ortho-k 25.07 ± 0.82 25.26 ± 0.87
Control 25.25 ± 1.06 25.56 ± 1.02
spherical equivalent refractive error (SER)   
Low myopia   
Ortho-k 0.00 ± 0.24 −0.22 ± 0.24
Control −2.09 ± 0.43 −2.73 ± 0.77
Moderate myopia   
Ortho-k −0.36 ± 0.45 −0.71 ± 0.45
Control −4.52 ± 0.86 −5.06 ± 0.98
High myopia   
Ortho-k −1.97 ± 1.30 −2.17 ± 1.30
Control −7.59 ± 1.34 −8.19 ± 1.39
Total   
Ortho-k −0.80 ± 1.18 −1.05 ± 1.15
Control −5.02 ± 2.34 −5.60 ± 2.38