In Canada,and the states I believe-all minima is predicated on RVR,and what one see's at MDA/DH.The only time Ceiling is referred to is in the flight planning ALTernate Minima.600/2.800/2 etc.
With the advent of CAT2 years ago the industry tried to erradicate all references to Cloud/ceilings,but was retained by the Feds for 'operations'