I have been a patient of Dr. Joanna Yu's for approximately 4 years. I have never had an optometrist who was so thorough and spent so much time explaining everything to me. In October of 2020 during a routine checkup she detected a macular hole in my eye. She immediately referred me to a Retinal Specialist at St. Michael's Hospital. I was operated on and the hole repaired. I can not recommend Dr. Yu enough.