Prof. Clement C.Y. Tham is the Chairman of the Department of Ophthalmology and Visual Sciences (https://www.ovs.cuhk.edu.hk/en/ ) at The Chinese University of Hong Kong (CUHK), S.H. Ho Professor of Ophthalmology and Visual Sciences at CUHK, and Director of The CUHK Eye Centre (https://www.ovs.cuhk.edu.hk/en/clinical-services/cuhk-eye-centre/ ). Prof. Tham is the President and Fellowship Examiner of the College of Ophthalmologists of Hong Kong (https://www.cohk.org.hk/), which is the statutory body in Hong Kong responsible for setting and upholding standards of ophthalmic training, Fellowship examinations, and clinical practice. Prof. Tham is the former Honorary Chiefs-of-Service in Ophthalmology at Hong Kong Eye Hospital, Prince of Wales Hospital, and Alice Ho Miu Ling Nethersole Hospital.

Internationally, Prof. Tham is the Secretary General and CEO of the Asia-Pacific Academy of Ophthalmology (APAO – https://apaophth.org/ ), which is the largest supranational ophthalmic organization, comprising 36 national ophthalmic member societies and regional subspecialty member societies, in the Asia-Pacific region. Membership of APAO member societies totals over 86,000 ophthalmologists, which is around 59% of the total number of ophthalmologists in the world. Prof. Tham is the Chair of the APAO Congress Committee, organizing every annual APAO Congresses from 2009 to now. He was the Congress President of the 33^rd APAO Congress 2018 in Hong Kong.

Prof. Tham is the Treasurer of the International Council of Ophthalmology (http://www.icoph.org/ ). The International Council of Ophthalmology is the largest professional organization of ophthalmologists, with the broadest geographical coverage, in the world. The International Council of Ophthalmology has more than 180 national, regional, and subspecialty member societies from around the world, connecting the world’s ophthalmologists, working together to preserve and restore vision. He was appointed the Chair of the Scientific Program Committees of the World Ophthalmology Congress 2016 Guadalajara (WOC2016 Guadalajara) in Mexico, and the World Ophthalmology Congress 2018 Barcelona (WOC2018 Barcelona) in Spain. The WOC is the primary professional educational program of the International Council of Ophthalmology, and the most important and widely attended ophthalmology conference on the international ophthalmic calendar. More than 2000 distinguished ophthalmologists and visual scientists from around the world participated in the scientific programs in each of these 2 WOCs.

Prof. Tham has been the Vice President of the Asia-Pacific Glaucoma Society (https://www.apglaucomasociety.org/ ) since 2014. He was the Chair of the Scientific Program Committee of the Inaugural Asia-Pacific Glaucoma Congress (APGC) 2012 organized by the APGS in Bali, Indonesia, and the Congress President and Chair of the Organizing Committee of the 2^nd APGC 2014 in Hong Kong.

Prof. Tham is a member of the Board of Governors of the World Glaucoma Association (https://wga.one/ ), and was Chair of the Organizing Committee for the World Glaucoma Congress 2015 (WGC 2015) in Hong Kong.

For his work on prevention of blindness, Prof. Tham was awarded the inaugural Nakajima Award by the APAO, and the Ten Outstanding Young Persons Award in Hong Kong, in 2005. Prof. Tham received the APAO Outstanding Service in Prevention of Blindness Award in 2011, the APAO Distinguished Service Award in 2013, and the Senior Achievement Award from the American Academy of Ophthalmology (AAO) in 2016. At the 28^th APAO Congress 2013 Hyderabad, Prof. Tham was presented the Holmes Award, the highest award for prevention of blindness in the Asia-Pacific region. In 2015, Prof. Tham received the De Ocampo Award Lecture at the APAO 2015 Congress in Guangzhou, China, the highest award for excellent academic achievements in eye research. In the same year, Prof. Tham was invited to present the Honored International Lecture at the Annual Meeting of the American Society of Cataract and Refractive Surgery (https://ascrs.org/ ) in San Diego, USA. Prof. Tham has also received numerous other awards in recognition of his contributions to research and teaching in ophthalmology.