China Axial Length Study (CALS)

Shanghai Eye Disease Prevention and Treatment Center

Status: Enrolling

Conditions: Myopia; Child Development; Axial Length

Study type: Observational

Funder types: Other

Identifiers

NCT05770661

NO.CALS20220101

Details and patient eligibility

About

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.

Enrollment: 30,000 estimated patients

Sex: All

Ages: 3 to 18 years old

Volunteers: Accepts Healthy Volunteers

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

Trial design

30,000 participants in 2 patient groups

Myopes

Description:

To collect the ocular data among myopic children.

Non-myopes

Description:

To collect the ocular data among non-myopic children.