Fig. 1

A flow diagram of the study design. OK, orthokeratology lens; OK + 0.01%ATP, orthokeratology lens combined with 0.01% atropine eye drops; OK + 0.025%ATP, orthokeratology lens combined with 0.025% atropine eye drops; OK + 0.05%ATP, orthokeratology lens combined with 0.05% atropine eye drops.