Do ICAO even publish that kind of thing?
From EU-OPS:
“Visual approach”. An approach when either part or all of an instrument approach procedure is not completed and the approach is executed with visual reference to the terrain.
Sub Part E, OPS 1.435
Also, from Appendix 1 to Sub Part E:
(g) Visual Approach. An operator shall not use an RVR of less than 800 m for a visual approach.