Classification of Myopia
摘要
Myopia is derived from the Greek word ‘muopia’, which stands for ‘to close the eyes’; hence, it is also termed near-sightedness. It is described as a clinical condition where straight rays of light coming from far away and passing through various refracting structures of the eye are concentrated ahead of the retinal surface, with accommodation being at rest. Myopia and uncorrected refractive errors, along with cataracts, degenerative macular disorders, vitamin A deficiency and infections, have been classified among the frontrunner causes of visual morbidity and blindness worldwide by the World Health Organization [1]. Myopia is generally defined as a refractive error above 0.25/0.5 diopter; however, the risk of ocular complications that can lead to significant visual loss occurs in myopia above 6 diopter [2].