Comparative analysis of treatment zone diameter, location and amount of maximum defocus and pupil size with orthokeratology

Purpose: The purpose of this study was to retrospectively examine data from young patients who had undergone orthokeratology (OK) for myopia control to quantify the size and amount of central (treatment zone) and mid-perpheral (reverse zone) total refractive power (TRP) changes and compare where these changes occur with respect to the pupil size (PS) and location.