First, I think you need to clarify your question. Under whose rules are you operating? What type aircraft?
Presumably ILS, as you are talking about LVP.
AFAIK vertical visibility is not measured, so cannot be reported.
If the RVR is 1500+, then under JAR-OPS there is no approach ban for a Cat I ILS (RVR required typically 550m) so you can make an approach. If you see nothing at DH you go around. What's the problem?