A randomised study to evaluate the effects of 0.01% and 0.02% atropine eye drops (one drop once nightly to both eyes) on myopic progression, pupil diameter and accommodative amplitude in myopic patients. Four hundred myopic children were divided into three groups: 138 (0.02%), 142 (0.01%) and 120 (control group only wore single-vision (SV) glasses). After 12 months, the spherical equivalent refractive error (SER) change was -0.38D, -0.47D, -0.7D and axial length (AL) change was 0.3mm, 0.37mm and 0.46mm respectively (all p<0.001). 0.01% and 0.02% atropine have similar effects on pupil diameter and accommodation amplitude after 12 months treatment. The authors concluded that 0.02% had a better effect on myopic progression than 0.01% atropine.