Li YANG graduated from medical optometry program at North Sichuan Medical College. He is a national Level-2 optometrist, and a member of International Academy of Orthokeratology - Asia. He specializes in retinoscopy, medical optometry, visual function examination, and refractive examinations and analysis of difficult eye conditions for people of all ages. He has experience in pediatric optometry, prevention and control of children and adolescent myopia, the fitting of adult progressive lenses, RGP (Rigid Gas Permeable, corneal contact lenses) and orthokeratology lenses.