Professor Clement C.Y. THAM is the Chairman of the Department of Ophthalmology and Visual Sciences at The Chinese University of Hong Kong (CUHK), S.H. Ho Professor of Ophthalmology and Visual Sciences at CUHK, and the Director of CUHK Eye Centre.   

Internationally, Prof Tham is the President of the Asia-Pacific Glaucoma Society (APGS), the largest supranational glaucoma professional society in the Asia-Pacific region. The APGS hosts the Asia-Pacific Glaucoma Congress (APGC) biennially in the Asia-Pacific region, which is the largest clinical and scientific glaucoma conference in our region. 

Prof Tham is the Secretary-General and CEO of the Asia-Pacific Academy of Ophthalmology (APAO), which comprises 39 national ophthalmic member societies and regional subspecialty member societies. Membership of APAO member societies totals over 120,000 ophthalmologists, which is around 59% of the total number of ophthalmologists in the world.  

Prof Tham is also the Founding President of the Hong Kong Glaucoma Society (HKGS), and the Vice President (Education and Examinations) of the Hong Kong Academy of Medicine. Prof Tham is the Past President of the College of Ophthalmologists of Hong Kong (COHK), and the Immediate Past Treasurer of the International Council of Ophthalmology (ICO). 

Prof Tham was recognized by Expertscape′s PubMed-based algorithms as the top 1% of scholars writing on Glaucoma in the previous 10 years.  He was voted to become a member of, ‵The Ophthalmologist Power List – Top 100 Most Influential Ophthalmologists′ in 2022, 2023, and 2024, the “Top 10” of “Asia-Pacific Eye 100” in 2023 and 2025, and the “World Eye-Cons-21” of the Asia-Pacific Journal of Ophthalmology (APJO) in 2024 and 2025. Prof Tham has also received numerous other international awards in recognition of his contributions to research and teaching in ophthalmology.