Is Ortho-K Safe? Infection Risk and Long-Term Care

MyopiaProgression.com · Teaching guide

VISUAL GUIDE 2 / 3

Keep “patient-years” beside the number

4 cases / 7,415 patient-years× 10,0005.4 per 10,000 patient-years

5.4microbial keratitis cases per 10,000 patient-years

95% confidence interval: 1.0–9.8. A patient-year is a unit of observation time, not an individual child.

Hiraoka et al. (2025): retrospective study at four Japanese hospitals; 1,438 Ortho-K wearers, mean age 12.7 ± 5.4 years. This is not lifetime risk or a head-to-head treatment comparison.Sources: [1] · Open or save this visual ↗

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