Also it is allowed to use converted meteorological visibity ( CMV ) , and ATC should not bother whether and which conversion factor has been used .
It should be noted that CMV can't be used for LVO operations as per "AMC1 CAT.OP.MPA.305(a) Commencement and continuation of approach".
As mentioned previously, ATC are not aware of what restrictions apply to each individual aircraft as they vary due to crew and aircraft qualifications/ limitations. ATC are aware of what conditions need to be applied for the airfield to be capable of supporting the required operations such as CAT I/II/III etc and will report the measured RVRs. It is for the crew to apply the appropriate criteria for their approach in accordance with their Operations Manual.