Patients in the 0.125 A + ACU group had less myopic progression and AL elongation ( -0.41 diopter and 0.24 mm/year ) than those in the 0.125 A group ( -0.66 diopter and 0.32 mm/year ) ( mean follow-up 14.7 months , p < 0.0001 and p = 0.02 , respectively ) .