Prevalence of astigmatism among 99,515 children in different areas of Xi'an City, China Ye Zhang; Xiaokang He; Wei Dong; Zihao Wang; Chengfei Liu; Yanying Li; Zhaojiang Du;

Practice of orthokeratology in Algeria: a retrospective study Mhamed Ouzzani; Moatez Billah Mekki; Selma Chiali; Fatiha Kail; Larbi Chahed;

Effect of high-energy visible light¿filtering spectacle lenses on high and low contrast distance visual acuity Nishanee Rampersad; Rekha Hansraj;