Dr. Liu graduated from the first medical optometry program at North Sichuan Medical College. He is a practicing physician, a national Level-1 optometrist, and a member of International Academy of Orthokeratology and Myopia Control Asia. Dr. Liu has been engaged in clinical work for more than ten years and specializes in the examination and treatment of difficult refractive error and visual function for people of all ages. He has extensive experience in the fitting of children's strabismus and amblyopia, corneal contact lenses, anti-fatigue lenses, Defocus Incorporated Multiple Segments (DIMS) spectacle lenses, and progressive multifocal lenses for students in myopia prevention and control, and adult progressive multifocal lenses for the middle-aged and elderly people.