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Guangzhou Outdoor Activity Longitudinal Study

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified October 2010 by Sun Yat-sen University.
Recruitment status was:  Enrolling by invitation
Information provided by:
Sun Yat-sen University Identifier:
First received: February 19, 2009
Last updated: November 19, 2010
Last verified: October 2010
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.

Condition Intervention
Myopia Behavioral: Outdoor activity

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Prevention
Official Title: A Controlled Clinical Trial of the Effect of Increases Time Outdoors in the Prevention of Juvenile-onset Myopia in Chinese Children

Further study details as provided by Sun Yat-sen University:

Primary Outcome Measures:
  • Cycloplegic refraction [ Time Frame: 1 year ]

Secondary Outcome Measures:
  • Visual acuity [ Time Frame: 6 months ]

Estimated Enrollment: 2000
Study Start Date: April 2009
Estimated Study Completion Date: July 2012
Estimated Primary Completion Date: April 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: Control
Experimental: Outdoor activity
Adding 1 hour outdoor time into school curricula
Behavioral: Outdoor activity
Adding 1 hour outdoor time into school curricula

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.

Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • All the students in Grade 1

Exclusion Criteria:

  Contacts and Locations
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Please refer to this study by its identifier: NCT00848900

China, Guangdong
Zhongshan Ophthalmic Center
Guangzhou, Guangdong, China, 510060
Sponsors and Collaborators
Sun Yat-sen University
Principal Investigator: Mingguang He, PhD, MD Zhongshan Ophthalmic Center, Sun Yet-sen University
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Mingguang He, Zhongshan Ophthalmic Center, ZOC Identifier: NCT00848900     History of Changes
Other Study ID Numbers: GOAL2009
Study First Received: February 19, 2009
Last Updated: November 19, 2010

Additional relevant MeSH terms:
Refractive Errors
Eye Diseases processed this record on September 21, 2017