近视眼是我国和世界许多国家、地区青少年学生的常见病和多发病。日本高中生视力低下率已达55%以上(1981),我国学生的近视率和视力低下率也相当高,有发展的趋势。如某市城区1980年中学生视力低下率为30.8%,1985年上升到55.0%(1985年为13～18岁学生,以下同);郊区农村1980年中学生视力低下率为24.8%,1985年上升到31.1%。1985年 Myopia is a common and frequently-occurring disease in young people in many countries and regions in our country and in the world. The prevalence of sight loss in high school students in Japan has reached over 55% (1981). The myopia rate and the low vision rate are also quite high in our country. For example, in 1980, the visual acuity rate of secondary school students in a certain city dropped from 30.8% to 55.0% in 1985 (for students aged 13 to 18 years in 1985, the following is the same); in rural areas, the low rate of vision of secondary school students in 1980 was 24.8% 31.1%. 1985