www.nature.com/scientificreports OPEN received: 18 February 2016 accepted: 20 June 2016 Published: 07 July 2016 Ocular biometric parameters among 3-year-old Chinese children: testability, distribution and association with anthropometric parameters Dan Huang1,*, Xuejuan Chen1,*, Qi Gong1,*, Chaoqun Yuan1, Hui Ding2, Jing Bai2, Hui Zhu1, Zhujun Fu1, Rongbin Yu3 & Hu Liu1 This survey was conducted to determine the testability, distribution and associations of ocular biometric parameters in Chinese preschool children Ocular biometric examinations, including the axial length (AL) and corneal radius of curvature (CR), were conducted on 1,688 3-year-old subjects by using an IOLMaster in August 2015 Anthropometric parameters, including height and weight, were measured according to a standardized protocol, and body mass index (BMI) was calculated The testability was 93.7% for the AL and 78.6% for the CR overall, and both measures improved with age Girls performed slightly better in AL measurements (P = 0.08), and the difference in CR was statistically significant (P