Since typical DH/RVR ratios don't expect the runway to be in sight at DH, (e.g in Cat 1 at 200ft the aircraft is 3000 ft from the threshold with 550m/1800ft RVR), what does the PM now call if only approach lights are visible? "No contact" or "runway in sight"? Neither of which is true?
The call should be "Visual", which means Visual Reference has been achieved ie the required number of approach lights. Whether the PF continues for the landing or does a GA is up to them.