2daddies, we are referring to IFR, Visual Approach (I can’t think of any VFRs that would permit 800 meters RVR - except helicopter in Germany where 500 meters met vis is legal).
The European definitions are (translated from Danish CAA approved textbook, with authors emphasis):
Visual Approach (VA):
If the aircraft obtains visual contact before the Instrument approach has been completed, the aircraft shall follow the Instrument approach anyhow, unless the aircraft
requests and/or accepts clearance for a VA
Clearance for a VA may be given to IFR flights, provided:
- The aircraft is able to maintain visual contact with the ground and
- The reported ceiling is not below the approved approach altitude or
- The aircraft at the approach altitude reports, that weather conditions will permit approach with visual contact to the ground and there is a reasonable certainty that landing can be completed.
Separation during VA:
- ATC is responsible for separation.
WMC-approach:
By
request from the aircraft, the aircraft may be given clearance for a VMC-approach, during which
the aircraft is responsible for separation until a specified
time, position or altitude, provided:
- The aircraft is able to remain VMC (my comment: normally 5 km below FL100, 1500m and 1000 feet clear of clouds)
- Daytime only
- Below FL200
- Only in airspace D and E
- ATC provides “Essential Traffic Information”.
Separation during VMC-approach:
- Pilot In Command is responsible for separation.