Guangzhou Outdoor Activity Longitudinal Study

A Controlled Clinical Trial of the Effect of Increases Time Outdoors in the Prevention of Juvenile-onset Myopia in Chinese Children

Status

UNKNOWN

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00848900

Enrollment

2000

Registered

2009-02-20

Start date

2009-04-30

Completion date

2012-07-31

Last updated

2010-11-22

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

Conditions

Myopia

Brief summary

The purpose of this study is to assess whether outdoor activities are effective in preventing the development and progression of juvenile-onset myopia in Chinese children.

Detailed description

1. To determine if increased engagement in outdoor activities reduces the development and progression of myopia in Chinese school children. 2. To identify the risk factors associated with the development and progression of juvenile-onset myopia. 3. To characterize the interaction between refractive error and education.

Interventions

BEHAVIORALOutdoor activity

Adding 1 hour outdoor time into school curricula

Study design

Allocation

RANDOMIZED

Intervention model

SINGLE_GROUP

Primary purpose

PREVENTION

Masking

NONE

Eligibility

Sex/Gender

ALL

Healthy volunteers

Inclusion criteria

* All the students in Grade 1

Exclusion criteria

* No

Design outcomes

Primary

Measure	Time frame
Cycloplegic refraction	1 year

Secondary

Measure	Time frame
Visual acuity	6 months

Countries

China

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Mar 5, 2026