Hmmm. According to another post there are no CATIIIB (aka "zero-zero") approaches in Canada. I can't be bothered to confirm that, actually I'm kinda surprised (well, not really) that even YVR or YYZ doesn't have 3B. But from my admittedly imperfect memory, for any other approach there are visual reference requirements.In the 757 we did CATIII approaches using three autopilots, again with a decision height of 50' but all you had to see was LAND3 in the annunciator. It was conceivable that you could land, rollout and brake to a stop without seeing anything.
CATII: 3 consecutive lights + a lateral element
CATIIIA: 3 consecutive lights
CATIIIB with DH: 1 centreline light
CATIIIB with no DH: no requirement for visual contact
You would definitely have to see more than just "LAND3" on the first three approaches and the fourth isn't available in Canada apparently. Apologies for the pedantry, I'm studying for some stupid exams on this stuff!