Received: 18 December 2022
Accepted: 26 April 2023
First Online: 1 July 2023
: The results of this study have been previously presented at the International Myopia Conference 2022. The results have been reported in the PhD thesis entitled “Variation of orthokeratology lens treatment zone (VOLTZ) study”.
: This study was conducted according to the tenets of the Declaration of Helsinki, with written consent obtained and ethics approval (HSEARS20170118004) from the Human Subject Ethics Subcommittee of the School of Optometry of the Hong Kong Polytechnic University.
: Not applicable.
: R. Kojima is a clinical research and development director for Precision Technology Services (Vancouver, Canada), a partner in the KATT Design Group (Vancouver, Canada) and a clinical advisor to Medmont International Pty (Nunawading, Australia). Other authors have no proprietary interest in any of the products mentioned.