Abstract: Objective To investigate the myopia situation of students in Nantong City in 2021,provide a basis for the prevention and control of myopia in children and adolescents in Nantong City. Methods All municipal schools in Nantong City were investigated in 2021. Using stratified cluster sampling method,four schools were randomly selected from the main urban area of each county（city,district） and four schools were randomly selected from the selected townships,for a total of 31 327 students to undergo vision examinations. And the data were analyzed. Results There were 20 801 students with myopia,of which 134 wore orthokeratology lenses,and the detection rate of myopia was 66.40%. The myopia detection rate in girls was 69.30%,which was higher than that in boys（63.77%）（χ²=106.966,P<0.05）. The detection rate of myopia in students showed an increasing trend with the increase of academic stage（χ²_trend=5 700.878,P<0.05）,and the myopia detection rate of township students was lower than that of urban students（χ²=328.011,P<0.05）. The detection rate of myopia among kindergarten students in townships（24.84%） was higher than that of students in urban areas（18.67%）（χ²=9.249,P<0.05）. Among the students with myopia,45.69% were judged to be mildly myopic,41.76% were moderately myopic,and 12.56% were severely myopic. Conclusion The detection rate of myopia among children and adolescents in Nantong City in 2021 is at a high level,and the problem of myopia is showing a younger age,while girls,urban students,and young children in rural areas should be regarded as the key objects of prevention and control.

Key words: Myopia, Children and adolescents, Detection rate, Cross-section study, Grades