I'm with Chimbu. At minima in minimum vis:
CAT 1: 200' - vis 800m (550m RVR) - HIALS - you will NOT see the threshold.
CAT 2: 100' - RVR 400m - Threshold.
CAT 3: 20' - RVR 200 -Touchdown zone or RWY centreline lights.
If you can see that much, no counting of lights, you're OK. BRIEF what you expect to see. At minima PIC is an approved observer (refer AIP). If PIC sees enough, they see enough.
