Miao Yu1, Xu Wang2,3. 1. Department of Ophthalmology, The Second Hospital of Jilin University, Changchun, Jilin, China. 2. Sensory-Motor Interaction, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Fredrik Bajers Vej 7E-2, 9220, Aalborg, Denmark. x.wang2013@hotmail.com. 3. Department of Orthopedics, The Second Hospital of Jilin University, Changchun, China. x.wang2013@hotmail.com.