Myopia is a global healthy concern, especially the high myopia and pathological myopia among Asian populations. However, its mechanism still remains largely unclear. Recent findings suggested choroidal changes might be related to the development of myopia. This study is to useOCT angiography (OCT-A) to investigate parapapillary choroidal microvasculature change in myopic eyes, and try to find the cause-and-effect relationship between choroidal change and the development of myopia.

Inclusion Criteria:

1. Spherical equivalent measurement can be included in above 4 groups
2. Willing to be followed up in the future 10 years

Exclusion Criteria:

1. Deny to sign the patient consent, or deny to be followed
2. Evidence of cardiac, or diabetic, or CNS disease.
3. Clinically diagnosed with retinal or choroidal disease
4. Glucoma
5. Cataract or corneal disease that influence the quality of fundus OCTA image

After completion of the prospective observational study, we would like to share data for reasonable request from other researchers.