Hi Ted,
I'll answer the last part of your question first. There really isn't any set period that the school looks for, they just want to make sure that you know what the profession is about, and you know what you're getting into. If you read up on the issues facing the profession in Canada, and in Ontario specifically, it'll go a long way in your interview.
As far as the clinical aspect of UW, you must realise that the University is situated in a Univeristy Town, where the total population on the tri-cities area (KW + Cambridge) is 200,000. So you definitely won't get to see the same amount of patietns you would if you were at SUNY.
Unlike most US schools, you're first clinical experience is pretty late in your optometric curriculim. They send you down to the clinic in third year (which teaching you all the techniques in the first two years). I'm currently only seeing 3 patients every OTHER week, and have 1.5 days in the Ocular Health Clinic and 1.5 days in the dispensary in thie first term of year III. This increases next term to about 4 patients every OTHER week, and more time in OH and DS. The most number of patients you will see is 6 a day here.
To get more patient exposure, and TPA education, you are sent down to the US for a 4 month rotation. This is usually a private clinic run by an OD/MD which deals mainly in ocular pathology.
Fourth year is all clinic. There's the 4 month US term, a 6 week term in Canada where you work for a private practice (they call it the Primary Care and Practice Management rotation), and the rest of the time you're rotating through the school's different clinics (CL, OH, DS, PC, LV, BV, PEDS).
So when you graduate, you are prepared .. don't get me wrong on that point, but you don't get to see as much as some of the US students. That's why you want to take advantage of every opportunity you get when you're on your rotations to see something new. It's fine and easy to always take the glaucoma work-ups, or routine eye exams ... but finding that unique case is what you'll need to do in order to feel confident when you graduate.
Case in point, a patient came in with Bell's Palsy, bilateral keratoconus (corrected with specs only because he didn't like CL's), asthma, joint pain. Sounds like a handful, especially when it was my first day in Ocular Health. Well the fourth year walked me through it .. and you know what, all you do with a Bell's Palsy pt. is to ensure that the ocular surfaces don't dry out .... ie. give "tears".
Hope this helps. Good luck with your applications, and feel free to ask me any questions .. I'll try to help!