The profile of astigmatism in 6¿12-year-old children in Iran Hassan Hashemi; Amir Asharlous; Mehdi Khabazkhoob; Abbasali Yekta; Mohammad Hassan Emamian; Akbar Fotouhi;

Gender and age distribution of refractive errors in an optometric clinical population Samuel Otabor Wajuihian; Khathutshelo Percy Mashige;

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;