The high prevalence of myopia has become a global public health problem. The study amied to investigate the prevalence and progression of myopia associated with social environmental factors in Tianjin, a Chinese megacity in north China.
The high prevalence of myopia has become a global public health problem, especially in East and South Asian countries. It's still not clear for the prevalence and progression of myopia associated with social environmental factors. Thus, the investigators will conducted a long-term observational study to the effect of the socioeconomics, medical resources and school-related environmental parameters and others on the prevalence and progression of myopia among Chinese school-aged children and adolescent.
Study Type
OBSERVATIONAL
Enrollment
500,000
Tianjin Eye Hospital
Tianjin, Tianjin Municipality, China
RECRUITINGPrevalence of myopia
Myopia is defined as any eye's SER (sphere + 1/2 cylinder) of at least -0.5 diopters (D).
Time frame: up to 3years
Changes in prevalence of myopia
Myopia is defined as any eye's SER (sphere + 1/2 cylinder) of at least -0.5 diopters (D).
Time frame: up to 3years
Changes of Spherical equivalent
Changes of Spherical equivalent
Time frame: changes from baseline at 36months
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