AIM:To discuss the differences between rigid gas permeable contact lens(RGPCL) and frame glasses in juvenile myopia accommodative lag. METHODS: Fifty-seven newly diagnosed,10 to 15 years old, moderate to low myopia patients(114 eyes)were examined with medical optometry, corneal curvature and corneal topography.According to the wishes of parents, 27 patients chose RGPCL, 30 patients chose frame glasses. Based on best-corrected visual acuity, accommodative lag was determined by low diopter neutralization dynamic retinoscopy method in two groups. The patients were reexamined one time every 3 months, accommodative lag was measured again using the same method for comparative analysis after 1 year. RESULTS:Eye accommodative lag had no significant difference between the two groups (F=1.961, P=0.121). After 1 year , 25 patients(50 eyes) adhered to wearing glasses in RGPCL group, the amount of accommodative lag was no significant difference (P>0.05); 27 patients(54 eyes) adhered to wearing glaeees in frame glasses group, the amount of accommodative lag was significantly different (F=4.658, P<0.05); comparing the two groups (F=6.134, P<0.01). CONCLUSION: Accommodative lag in RGPCL-wearing eye was significantly less than that in frame glasses-wearing eye, which may have a role in slowing progress of juvenile myopia and should be vigorously promoted.