Dr Koh is Founding Partner and Senior Consultant at the Eye & Retina Surgeons, Camden Medical Centre; and Director, Retinal Centre International. He is Visiting Consultant to the Vitreoretinal Service, Singapore National Eye Centre (SNEC), Singapore Eye Research Institute (SERI), National University Hospital Services (NUHS) and Tan Tock Seng Hospital; He is immediate past President of the Singapore Society of Ophthalmology, and member of the Executive Council of the College of Ophthalmologists, Singapore. He also sits on the Council of the Asia Pacific Academy of Ophthalmology (APAO) and Asia Pacific Vitreoretina Society (APVRS). He is the founding Chairman and Honorary Adviser to the Retinitis Pigmentosa Society of Singapore. He was recently appointed Executive Director of ESASO (European School of Advanced Studies in Ophthalmology) Asia. He was Congress Secretary General and Vice President of the APAO Congress 2006 in Singapore; and Congress President of the 5thAPVRS in 2010.
Dr Koh completed Fellowships in Medical Retina at Moorfields Eye Hospital & Institute of Ophthalmology, London, UK (1998 – 1999) and at the Jules Stein Eye Institute, UCLA, Los Angeles, and USA (1999 –2000). The recipient of numerous prestigious awards, Dr Koh has authored or edited many publications in the field of ophthalmology.
His areas of expertise include degenerative macular disease such as choroidal neovascularisation, inherited retinal dystrophy, visual electrophysiology, fundus angiography and retinal vascular disease. He is regarded as one of the key opinion leaders on photodynamic therapy and Lucentis therapy in Asia. He was one of the first surgeons to introduce photodynamic therapy (PDT) in the Asia-Pacific. He is principal investigator of the EVEREST trial studying combination therapy for Polypoidal Choroidal Vasculopathy, and Chairman of the PCV Roundtable of Experts. He was one of the lead investigators in the REVEAL trial