The study aims to observe the ocular development and refractive error changes among school children and adolescents
This study aims to observe the refractive error changes of school children and adolescents for 3 years, and to collect data of ocular structural parameters, family history and environmental factors so as to understand the natural course and internal laws of myopia progression.
Study Type
OBSERVATIONAL
Enrollment
7,050
Zengcheng
Guangzhou, Guangdong, China
Zengcheng
Guangzhou, Guangdong, China
spherical equivalent change
SE was measured by autorefractometer with cycloplegic once a year at scheduled time Every 12 months, follow up for 3 years
Time frame: examine every 12 months, follow up for 3 years
Axial length
Axial length is measured by IOMaster once a year at scheduled time
Time frame: examine every 12 months, follow up for 3 years
Anterior chamber depth
Anterior chamber depth is measured by IOMaster once a year at scheduled time
Time frame: examine every 12 months, follow up for 3 years
lens thickness
lens thickness is measured by IOMaster once a year at scheduled time
Time frame: examine every 12 months, follow up for 3 years
Vitreous length
Vitreous length was measured by IOMaster once a year at scheduled time
Time frame: examine every 12 months, follow up for 3 years
Environmental factor
Time of outdoor activities \& short range reading,measured by questionnaire
Time frame: examine every 12 months, follow up for 3 years
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