What are the risks associated with contact lens wear?

All contact lenses are considered medical devices by Health Canada.  Consider a contact lens for what it is: a foreign body that you are inserting into your eye.  Lenses that are improperly fit can cause discomfort and abrasions.  Contact lenses can induce dry eye in susceptible individuals.   There is certainly the risk of infection, and when severe, infections can cause permanent vision loss.  Proper fit, hygiene, and adherence to wear schedule are critical in reducing the risk of complications.