wardr1:
Try this link to Transport Canada. It is for medical certificates in general.
CARS requirements
I don't know how AC differs, though I gather they have a one-eyed Captain somewhere.
Update: The CAMEs have now been given details of some mathematical formula for correction which frees up the restriction for Class I somewhat. It is called Equivalent Spherical Error and at the moment that's about all I know of it!
[ 14 December 2001: Message edited by: Code Blue ]