Study on the effect of increasing time outdoors on myopia onset and progression in school children

Status

Active, not recruiting

Phases

Early Phase 1

Study type

Interventional

Source

ChiCTR

Registry ID

ChiCTR2200057057

Enrollment

Unknown

Registered

2022-02-27

Start date

2022-03-01

Completion date

Unknown

Last updated

2023-09-26

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Refractive error, myopia

Interventions

intervention group:Increase time outdoors during class recess and weekends

Control group:No intervention, continue usual pattern of time outdoors

Eligibility

Sex/Gender

All

Age

6 Years to 12 Years

Inclusion criteria

Inclusion criteria: 1. Primary school students in grades 1-4 2. The written consent of the parent or guardian; 3. No congenital dysplasia, amblyopia or any other pathological changes in both eyes; 4. No diseases affecting visual development or refractive development, such as diabetes, fibrous tissue lesions, etc..

Exclusion criteria

Exclusion criteria: 1. According to the investigator's judgment, unable to understand or cooperate with the research process, unable to cooperate with the ophthalmological examination, unable to cooperate with the annual follow-up; 2. Wear contact lenses during the ophthalmic examination; wear orthokeratology lenses on the eve of the ophthalmic examination; 3. History of eye surgery; 4. Parents or guardians request to withdraw from the research.

Design outcomes

Primary

Measure	Time frame
Spherical equivalent;Axial Lenth;	—

Countries

China

Contacts

Public ContactNingli Wang

Beijing Tongren Hospital, Capital Medical University

wningli@vip.163.com+86 010-58265922

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026