For an average baseline age of 11.2 years , baseline SphE of -2.10 D , a baseline axial length of 24.6 mm , and 320 days of compliant lens wear , the estimated increase in axial length ( AL ) was 33 % less at 0.27 mm ( 95 % CI , 0.22-0 .32 mm ) than at 0.40 mm ( 95 % CI , 0.35-0 .45 mm ) for the contact lens and spectacle lens groups , respectively .
