Fig. 4From: Different patterns of myopia prevalence and progression between internal migrant and local resident school children in Shanghai, China: a 2-year cohort studyChange of myopia prevalence between 2010 and 2012 among migrant and resident children (Grade 3–4). Solid line with circle stands for myopia prevalence of migrant children in 2010; solid line with square stands for myopia prevalence of migrant children in 2012; dashed line with circle stands for myopia prevalence of resident children in 2010; dashed line with square stands for myopia prevalence of resident children in 2012Back to article page