Dr. Stephan Ong Tone

Dr. Stephan Ong Tone is a fellowship-trained clinician-scientist specializing in cornea and external diseases at Sunnybrook Health Sciences Centre and Sunnybrook Research Institute, and he serves as an assistant professor at the University of Toronto. His clinical focus includes the diagnosis and treatment of cataracts, corneal conditions, anterior segment disorders, and external eye diseases.

Dr. Ong Tone performs a wide range of surgical procedures, including complex cataract surgery, anterior segment surgery, corneal crosslinking, pterygium excision, ocular surface reconstruction, and various forms of corneal transplantation. He is trained in the latest techniques such as penetrating keratoplasty (PKP), deep anterior lamellar keratoplasty (DALK), Descemet’s stripping endothelial keratoplasty (DSEK), Descemet’s membrane endothelial keratoplasty (DMEK), and Descemet’s stripping only (DSO).

Dr. Ong Tone completed his BSc, MDCM, and PhD in Neurological Sciences at McGill University, followed by an ophthalmology residency at the University of Toronto where he served as co-chief resident. He then completed a two-year clinical-research fellowship in cornea, external disease, and refractive surgery at Massachusetts Eye and Ear, Harvard Medical School. His research has been recognized with several awards, including the 2018 Shire Research Scholarship and the 2019 Claes H. Dohlman Fellowship Award, and he received the Best Paper in Cornea at the 2019 American Academy of Ophthalmology Annual Meeting.