Prof Clement CY THAM
S.H. Ho Professor of Ophthalmology & Visual Sciences
BM BCh (Oxon), FCOphth (HK), FHKAM (Ophth), FRCOphth, FRCS (Glas), FCSHK





Contact :
(852) 3943 5823

clemtham@cuhk.edu.hk



Request An Appointment :
(852) 3943 5886

eyecentre@cuhk.edu.hk









Positions of ResponsibilityChairman, Department of Ophthalmology and Visual Sciences, The Chinese University of Hong Kong?
S.H. Ho Professor of Ophthalmology & Visual Sciences, The Chinese University of Hong Kong?
Director, CUHK Eye Centre
Deputy Director, Joint Shantou International Eye Center?
President, The College of Ophthalmologists of Hong Kong (COHK)?
Honorary Consultant, Hong Kong Eye Hospital, Prince of Wales Hospital, Hong Kong Children’s Hospital
Secretary General & CEO, Asia-Pacific Academy of Ophthalmology (APAO)
Treasurer, International Council of Ophthalmology (ICO)
Vice President, Asia-Pacific Glaucoma Society (APGS)?
Chair, Academia Ophthalmologica Internationalis (AOI)







BiographyProf. Clement CY 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 Director of The CUHK Eye Centre. Prof. THAM is the President and Fellowship Examiner of the College of Ophthalmologists of Hong Kong, 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), 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. 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? 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 , 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 in San Diego, USA. Prof. THAM has also received numerous other awards in recognition of his contributions to research and teaching in ophthalmology.

Research AreasThe primary academic interest of Prof. Tham lies in angle closure glaucoma, as well as the laser and surgical treatments of glaucoma. Prof. Tham’s earlier work established a role for argon laser peripheral iridoplasty in the treatment of acute primary angle closure and other forms of angle closure glaucoma. More recently, his randomized controlled trials provided insight into the roles of lens extraction and other glaucoma surgeries in both acute and chronic primary angle closure glaucoma eyes. Prof. Tham was a member of the research consortium that identified the first genetic mutation associated with primary angle closure glaucoma.




Academic Activities
Co-Chair, Scientific Program Committee The 34th Asia-Pacific Academy of Ophthalmology Congress 2019 (Thailand)
Chair, Scientific Program Committee World Ophthalmology Congress 2018 (Spain)
Congress President The 33rd Asia-Pacific Academy of Ophthalmology Congress 2018 (Hong Kong)
Co-Chair, Scientific Program Committee The 32nd Asia-Pacific Academy of Ophthalmology Congress 2017 (Singapore)
Chair, Scientific Program Committee World Ophthalmology Congress 2016 (Mexico)
Vice President The 21st Congress of Chinese Ophthalmological Society 2016 (China)
Chair of Organizing Committee World Glaucoma Congress 2015 (Hong Kong)
Congress President and Chair of Organizing Committee The 2nd Asia-Pacific Glaucoma Congress 2014 (Hong Kong)
Chair of Scientific Program Committee The 28th Asia-Pacific Academy of Ophthalmology Congress 2013 (India)
Chair of Scientific Program Committee The 27th Asia-Pacific Academy of Ophthalmology Congress 2012 (South Korea)
Chair of Scientific Program Committee The Inaugural Asia-Pacific Glaucoma Congress 2012 (Indonesia)




Research Highlights
Research ProgrammesPrimary angle closure glaucoma (PACG) and normal tension glaucoma (NTG) – patterns and risk factors of disease progression.
The roles of lens extraction, alone or in combination with laser and / or surgical glaucoma interventions, in glaucoma eyes.
The clinical efficacy and safety of glaucoma interventions, including laser peripheral iridotomy and iridoplasty, trabeculectomy (penetrating, non-penetrating, carbon dioxide laser-assisted), goniosynechialysis (GSL), glaucoma implant surgery, laser cyclodestructive procedures (trans-scleral and endoscopic), and various combinations of the above.
Molecular genetics, mechanisms, and epi-genetics of glaucoma.
Diurnal intraocular pressure (IOP) profiles and the impact of different treatments on IOP fluctuations in glaucoma eyes.
The anatomical effects of surgery on the anterior segment structures in glaucoma eyes.
Cost-effectiveness of glaucoma treatments.


AccomplishmentsCUHK established argon laser peripheral iridoplasty (ALPI) as a more effective and safe first-line intervention for acute glaucoma (acute primary angle closure). Compared to conventional systemic IOP-lowering drugs that were used extensively in the past, ALPI reduces symptoms and IOP more rapidly, and avoids the side effects commonly associated with such drugs. ALPI may also reduce the need for long-term glaucoma medications. ALPI has since been widely adopted worldwide as the first-line treatment of acute glaucoma (acute primary angle closure).
Our randomized controlled trial confirmed that early lens extraction was more effective than conventional laser peripheral iridotomy in preventing the progression to the chronic form of glaucoma (primary angle closure glaucoma) after an episode of acute glaucoma (acute primary angle closure). This finding revolutionizes the management of acute glaucoma eyes. The CUHK group has been invited to present instruction courses on the management of acute glaucoma in major international conferences regularly since 2002.
Our randomized controlled clinical trials clearly documented the beneficial effects and safety profile of early cataract extraction in PACG, and thus establishing a role for cataract extraction as a first-line surgical approach in selected PACG eyes. CUHK has documented the clinical outcomes of cataract extraction, performed in isolation or in combination with other glaucoma surgery, in PACG eyes. Our group is widely regarded as one of the leading clinical research groups on the surgical management of PACG.
One of our latest clinical trials evaluated the role of clear lens extraction in uncontrolled PACG eyes. Lens extraction reverses the anatomical predisposition to angle closure and improves IOP control in PACG eyes. Lens extraction may also be combined with other interventions to further improve clinical outcomes.
CUHK is a key member of the research consortium that identified the first gene, ABCC5, associated with PACG. ABCC5 influences anterior chamber depth. A shallow anterior chamber depth is an important genetic predisposition to angle closure and PACG.
Our group documented IOP fluctuations in PACG patients in their usual non-clinic environments using a self-monitoring electronic device to measure IOP with rebound tonometric technology, and also IOP fluctuations in PACG patients during their normal activities of daily living using a wireless contact lens tonometer. These techniques open up a whole new area of research to help us better understand the role of IOP fluctuations in disease progression, and may offer us new possibilities for better treatment approaches in future.


Representative Publications:Tham CC, Kwong YY, Baig N, Leung DY, Li FC, Lam DS. Phacoemulsification versus trabeculectomy in medically uncontrolled chronic angle-closure glaucoma without cataract. Ophthalmology 2013;120(1):62-7.
Tham CC, Kwong YY, Leung DY, Lam SW, Li FC, Chiu TY, Chan JC, Lam DS, Lai JS. Phacoemulsification versus phaco-trabeculectomy in chronic angle-closure glaucoma with cataract: complications. Arch Ophthalmol. 2010;128(3):303-11.
Featured in the Journal Highlights section of Eyenet in March 2010.
Tham CC, Kwong YY, Leung DY, Lam SW, Li FC, Chiu TY, Chan JC, Lam DS, Lai JS. Phacoemulsification versus combined phaco-trabeculectomy in medically-uncontrolled chronic angle closure glaucoma with cataract. Ophthalmology. 2009;116(4):725-31, 731.e1-3.
Tham CC, Kwong YY, Leung DY, Lam SW, Li FC, Chiu TY, Chan JC, Chan CH, Poon AS, Yick DW, Chi CC, Lam DS, Lai JS. Phacoemulsification versus combined phaco-trabeculectomy in medically-controlled chronic angle closure glaucoma with cataract. Ophthalmology 2008;115(12):2167-2173
Nongpiur ME, Khor CC, Jia H, Cornes BK, Chen LJ, Qiao C, Nair KS, Cheng CY, Xu L, George R, Tan D, Abu-Amero K, Perera SA, Ozaki M, Mizoguchi T, Kurimoto Y, Low S, Tajudin LS, Ho CL, Tham CC, Soto I, Chew PT, Wong HT, Shantha B, Kuroda M, Osman EA, Tang G, Fan S, Meng H, Wang H, Feng B, Yong VH, Ting SM, Li Y, Wang YX, Li Z, Lavanya R, Wu RY, Zheng YF, Su DH, Loon SC, Yong VK, Allingham RR, Hauser MA, Soumittra N, Ramprasad VL, Waseem N, Yaakub A, Chia KS, Kumaramanickavel G, Wong TT, How AC, Chau TN, Simmons CP, Bei JX, Zeng YX, Bhattacharya SS, Zhang M, Tan DT, Teo YY, Al-Obeidan SA, Hon do N, Tai ES, Saw SM, Foster PJ, Vijaya L, Jonas JB, Wong TY, John SW, Pang CP, Vithana EN, Wang N, Aung T. ABCC5, a gene that influences the anterior chamber depth, is associated with primary angle closure glaucoma. PLoS Genet. 2014 Mar 6;10(3):e1004089.
Vithana EN, Khor CC, Qiao C, Nongpiur ME, George R, Chen LJ, Do T, Abu-AmeroK, Huang CK, Low S, Tajudin LS, Perera SA, Cheng CY, Xu L, Jia H, Ho CL, Sim KS, Wu RY, Tham CC, Chew PT, Su DH, Oen FT, Sarangapani S, Soumittra N, Osman EA,Wong HT, Tang G, Fan S, Meng H, Huong DT, Wang H, Feng B, Baskaran M, Shantha B, Ramprasad VL, Kumaramanickavel G, Iyengar SK, How AC, Lee KY, Sivakumaran TA,Yong VH, Ting SM, Li Y, Wang YX, Tay WT, Sim X, Lavanya R, Cornes BK, Zheng YF, Wong TT, Loon SC, Yong VK, Waseem N, Yaakub A, Chia KS, Allingham RR, Hauser MA, Lam DS, Hibberd ML, Bhattacharya SS, Zhang M, Teo YY, Tan DT, Jonas JB, Tai ES, Saw SM, Hon do N, Al-Obeidan SA, Liu J, Chau TN, Simmons CP, Bei JX, Zeng YX, Foster PJ, Vijaya L, Wong TY, Pang CP, Wang N, Aung T. Genome-wide association analyses identify three new susceptibility loci for primary angle closure glaucoma. Nature Genetics. 2012;44(10):1142-6.
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