Dr. Koo is a licensed Optometry in ON. Medical degree obtained from University of Waterloo Optometry & Vision Science. Currently practices at Dr. Diana Zhang Optometry (Dr. Diana Zhang Optometry), located at 424 Dundas St. W, Toronto, ON M5T 1G7. Dr. Koo specializes in ocular disease, refractive surgery, contact lenses, neuroophthalmology, oculoplastics and primary care.. In addition to English, Dr. Koo speaks Cantonese.