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Analysis reveals a 2:3 change ratio of refractive error to corneal power in orthokeratology, suggesting complex interactions.
We analyzed data from 4 orthokeratology studies of refractive error change (ARE) and keratometer‐reading change (ΔK). Instead of the reported ΔRE/ΔK ratio of 2:1, we calculated from linear‐regression analysis a ratio (slope) of 2:3. The ordinate intercept of the straight line fitted to the data (N = 181 eyes) indicates that when ΔK = 0, ΔRE = 0.72. The correlation between ΔK and ΔRE is poor (+0.63). Causes and interpretations of these results are discussed.
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Erickson et al. (1977) studied this question.
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