Fig. 3From: Different patterns of myopia prevalence and progression between internal migrant and local resident school children in Shanghai, China: a 2-year cohort studyMyopia incidence (a), change of SE (b) and AL (c) between resident and migrant children. Blank rectangles stand for grade 1 and rectangles with oblique line stand for grade 2. SE, spherical equivalent refraction; AL, axial lengthBack to article page