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;

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;

Ethnicity and refractive errors in Peruvian children aged 7¿11 years: A five-year analysis of the Demographic and Health Survey Guillermo De-La-Borda-Prazak; Carolina Mendez-Guerra; Fiorella Huertas-Campos; Percy Herrera-Añazco; Vicente A. Benites-Zapata;