If you were visual and had the appropriate in flight conditions for making a visual approach and the reported Visibility / RVR at the runway was suficient for a visual approach and ATC cleared you for a visual approach...........then I can't see a problem.
Of course had the RVR reduced below the minima for a visual approach at any time you would have went missed.........and being visual, many of the risks associated with an instrument approach to minimums in poor weather including the temptation to duck under are simply not there.
The absolute minimum RVR for a visual approach is 800m. The ops manual may require more at some aerodromes.
Regards,
DFC