Figure 2. Efficacy of brimonidine on inhibiting progressing myopia. The alternation of refractive error (RE), axial length (AL), and intraocular pressure (IOP) during experiment in groups A, B, C, and F is shown. All values were calculated as the difference between the right eye and the left eye. A: RE changing course in 3 weeks. B: Histogram analysis of the difference in RE before and after the experiment. C: AL changing course in 3 weeks. D: Histogram analysis of the difference in AL before and after the experiment. E: IOP changing course in 3 weeks. F: Histogram analysis of the difference in the IOP before and after the experiment. *p<0.05 (n=6). (Group A: 2% pirenzepine group; Group B: 0.2% brimonidine group; Group C: 0.1% brimonidine group; Group F: medium group).