In the UK the term IRVR (Instrumented Runway Visual Range) refers to electronic measurement. The 'Human Observer' method gives RVR, although in either case normally passed on the R/T as "RVR".
The Official Met. visibility is assessed by a qualified 'Met. Observer', who will either be a Met. Office employee, or more usually these days, at Civil Airports, a member of the ATC staff who has obtained the appropriate training and qualification.