Time spent outdoors and myopia: establishing an evidence base

Myopia is a highly prevalent refractive error in Asia (1). Although mild myopia does not have serious ocular ramifications, pathological myopia is associated with the development of various ocular pathologies that can lead to irreversible visual loss or blindness (2). The prevalence of visual impairment attributable to pathologic myopia is 0.2-1.4% in Asian populations (3).