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Table 1 Inclusion criteria

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

Age Subjects were 7–14 years of age
Visual acuity Had no other ocular diseases aside from refractive error and no keratoconus (confirmed by pre-treatment corneal topography)
Refractive errors Had an intraocular pressure (IOP) of <21 mmHg
Ocular health Had an with-the- rule astigmatism (axes 180 ± 30) ≤ 1.50 D
  Had a BCVA (best corrected visual acuity) ≤0.00 log MAR units in both eyes (Snellen equivalent to 20/20)
  Had no binocular vision problems
Others No medications that might affect refractive development
  Had no history of ortho-k or contact lens wear
  Maintained regularly scheduled visits and completed the 2-year follow-up
  Had no significant deviations during lens wear (criteria only for ortho-k group)
  Discontinued lens wear a total of 30 days or less during the 2 years (criteria only for ortho-k group)