There was a prospective cohort observational study. Forty hyperopic children, 40 myopic children and 120 emmetropia children were randomly selected from grade 1 to grade 3, and were followed up every six months for 3 years. All patients received cycloplegic refraction examination, ocular biological test, binocular visual function test and a questionnaire related to daily eye habits. A multi-level and multi-dimensional data analysis model was constructed to explore the possible factors affecting the occurrence and development of myopia in children.

Inclusion Criteria:

• students in grades 1-3
• Can cooperate with the examination of students

Exclusion Criteria:

• Obvious strabismus and amblyopia
• Eye diseases that affect vision, such as congenital cataracts, glaucoma, and retinal diseases
• History of ocular surgery

Healthy children with hyperopia, emmetropia and myopia