Dr. John Chang was trained in ophthalmology at Jules Stein Eye Institute UCLA. He then did a fellowship at UCSF. He is Immediate Past President of the International Society of Refractive Surgery (ISRS). He is Past President of the Hong Kong Association of Private Eye Surgeons and is Associate Clinical Professor of The University of Hong Kong and the Chinese University of Hong Kong. Dr. Chang is currently the Director of the Guy Hugh Chan Refractive Surgery Centre of Hong Kong Sanatorium & Hospital. He is Clinical Instructor for many refractive intraocular lenses and procedures and frequently runs courses for doctors in the region. He is on the Executive Committee of the APACRS, is on the Editorial Board of Cataract & Refractive Surgery Today and Ocular Surgery News, and is chief editor of the Chinese edition of EuroTimes.