If the rvr is as reported then lvp is in force. Therefore the option of a visual approach does not apply. Furthermore as you descend through decision you may find your vis not usable.
This was the case in man on sun Night. as we approached we could see the runway from 40 miles and clearly all the way to about 200 feet. Then it all went blurry. Hope this helps.
The preamble for lvp in your part A for cat 3 landings should include a section on the structure of fog which may expand on the reasons for this