I am also a Canadian Student attending Optometry school this Fall in the United States!
This question is one of my biggest concerns and I can provide you with the information I have gathered so far.
1) One of the best ways to go is try and get a Provincial and Federal Government loan. Once you apply for your provincial Loan, they do the Federal application all in one so dont worry about doing two separate applications. I spoke with a representative on the phone for the Manitoba Provincial Loan as that is my home province, and she told me applications don't open up till some time in may for Fall 2015 but how it works is they can provide up to a maximum of $250 CAD per week of study, so for a typical September to April semester here, its close to #12,000 dollars. Also there is no maximum of weeks of study, so it can be all 52 weeks of the year if it happened to run that long.
2) The part that will cover most of your tuition would be a Canadian Bank loan. Most banks that I have contacted all have a similar structure to how they give out loans to Canadian students studying outside of the US and they have become much more strict on this in the past couple of years. Major banks such as CIBC, Scotiabank, RBC have all told me they do a maximum of $125,000 CAD for the entire 4 years with an interest of Prime plus 1 +/- .5. Now if you know someone at a bank or have any connections, you might be able to get better deals on the interest, as for the actual maximum amount, Im confident they are firm, but again, you never know what connections can do for you. I have not spoken to TD bank yet but online it says to come see a consultant because each program varies on cost and they try to accommodate that. TD is one of the biggest banks in Canada so I have little hope that they have rules where you get more than 125,000 per year but I am going to meet someone soon because if they do, it would be perfect!
3) Any remainder is our own cost. I don't come from a very wealthy family background where I want to put this huge burden on my parents either So i am looking for any option I can. It sucks how money can prevent someone from reaching a goal of theirs but people have done this and do it all the time so we all should be able to figure it out!
Best of Luck and if you find out any information, share with the rest of us!