Visual
Participating in an IVA at YSSY?
Call "runway [rwy] in sight" if you have/had it in sight and expect to keep it in sight on a normal circuit. That way you can be on a 30deg join onto final and avoid delaying yourself and aircraft on the parallel final, and keep director happy.
Call "visual" if you really can't see the runway but will comply with the rules for "visual" flight mentioned above. You won't get the <30deg cut but could still have traffic next to you on final. Director will have to work a bit harder. Foreign registered and QF 747s at night are treated this way in all cases.
Calling "runway was in sight but behind us" - well, yes of course dummy, it usually is on downwind. Director will cuss!
Call "34R and L in sight" to hint that you're OK to accept last-minute change.