Runway Visual Range (RVR)
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Runway Visual Range (RVR) is the range over which the pilot of an aircraft on the centre line of a runway can see the runway surface markings or the lights delineating the runway or identifying its centre line. (ICAO Annex 6: Operation of Aircraft)
RVR is an essential element of Aerodrome Operating Minima (AOM).
JAR-OPS 1, especially paragraph 1.430, Appendix 1 and related IEM. ICAO Annex 6 (Operation of Aircraft) especially Chapter 4 and Appendix 2.