Time Outdoors as an Intervention for Myopia in Children

Inclusion Criteria: 1. at baseline be enrolled in grade 1 and 2 of primary schools; 2. have a parent or guardian who is able to read and comprehend Mandarin and give informed consent as demonstrated by signing a record of informed consent; 3. Children verbally consent when registration for examination Exclusion Criteria: 1. Any systemic or ocular pathology that may affect the refractive error status of the eye; 2. Strabismus and amblyopia; 3. Intellectual disability; 4. Using any anti-myopia treatments (orthokeratology, atropine, accommodation function training, acupuncture, auricular point sticking, progressive addition spectacle lenses or other anti-myopia contact lenses). 5. Not suitable for inclusion in the study as deemed by the investigator.