China Children Eye Study

China Nine Provinces Children Eye Study

The primary objective of this multi-center, observational study is to establish the reference ranges of axial length in Chinese children and adolescents.

30,000 children aged 3-18 years were examined with cycloplegia to collect their ocular parameters and were all followed up for three years with annual visits.

Inclusion Criteria:

• Aged 3 to 18 years
• Have been lived in the research areas for at least one year, and will not move to other places in the following two years
• Parents or guardians sign an informed consent form, and children over 6 years old need oral consent to participate

Exclusion Criteria:

• Mental diseases, unable to cooperate to complete the eye assessment
• Ophthalmic diseases, inability to cooperate to complete the inspection