I have just researched Aston University's MOptom programme in the UK. This program makes it sound it is possible to come back to Canada easily, and it seems like many Canadians apply. http://www.aston.ac.uk/study/undergraduate/courses/lhs/bsc-optometry/faqs-for-canadian-applicants/
This program is 3 years long with 1 year of studying and working as an optometrist for their pre-reg year. This would allow Canadiansto continue using their study visa, instead of applying for another work visa. I believe Waterloo requires a year of work experience in the country you are applying from for the IOBP, so this sounds like good news. You would then need to pass the UK boards and become registered before applying to IOBP, as well.
Aston's University also states that their curricullum provides you with enough knowledge to pass the evaluating exam so you only need to the Bridging I (2 months). How likely do you guys think this is? And even if I were to complete Bridging I, are the Canadian board exams a whole other obstable for a UK trained optometrist?