Sorry, don't have chapter and verse but, bearing in mind the warning above of illusory effects, what you see out of the window is what you see out of the window.
To recap, RVR's over-rule Metviz, and to continue an approach beyond FAF, or OM or 1000' above threshold if FAF is not specified, then you must have an RVR or failing this a corrected metviz(table 5) equal to or above that required for the approach. For non-precision approaches the minimum cloud base (bkn or ovc) must be equal to or greater than the MDA for the approach.
If you have the runway environment in sight then you can continue because the conditions for continuing below the decision altitude are already fulfilled.
Its quite an unusual condition, especially when the approach is over water.
I remember the first time, seeing the airport from 20-30 miles out one night and RVR.s varying between 600-700m.
I was considering a visual approach but decided that, just as discretion is the better part of valour so is cowardice the better part of discretion, and made an ILS. The fog was only 20'-50' thick and a visual would have worked!
It is not unknown for the RVR sensors to get contaminated, svere frost for example.