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Progression status at 18‐month follow‐up for the orthokeratology and single‐vision spectacle groups. No progression: ≤0 mm; emmetropic progression (0 D/year): >0–0.22 mm; low progression (<0.5 D/year): >0.22‐0.41 mm; intermediate progression (>0.5 < 0.75D/year): >0.41‐0.62 mm; fast progression (>0.75D/year): >0.62 mm. M18 = 18‐month follow‐up; OKL = orthokeratology group; SVS = single‐vision spectacle group.
