AIM: To investigate the characteristics of the refractive state of the youngsters of different ages, and to provide a scientific basis for the prevention and control of juvenile myopia.

METHODS: Visual acuity, computer optometry, inserts, anterior segment and fundus were examined in eyes of 37 700 students from some schools in local county.

RESULTS: There were statistically significant differences in the subnormal vision rate among different age groups from 7 to 18 years old. There were statistically significant differences in the hyperopia and myopia incidence among different age groups from 7 to 18 years old.

CONCLUSION: With the increase of age, adolescents' refractive state is changing. The number of juvenile hyperopia decreases gradually, while the number of juvenile myopia increases gradually. The follow-up observation is needed to protect them from the change of vision and refractive state to make the proper treatment.