Here's what the Canadian regs say..
A visual approach is an approach wherein an aircraft on an IFR flight plan (FP), operating in visual meteorological conditions (VMC), under the control of ATC and having ATC authorization, may proceed to the airport of destination.
The controller considers acceptance of a visual approach clearance as acknowledgement that the pilot shall be responsable for:
a...at controlled aerodromes, maintaining separation from traffic that the pilot is instructed to follow;
b...maintaining adequate wake turbulence separation;
c...navigation to the final approach;
d...adherence to published noise abatement procedures and compliance with any restrictions that may apply to Class F airspace; and
e...at uncontrolled aerodromes, maintaining appropriate separation from VFR traffic that, in many cases, will not be known to ATC.
A visual approach is not an instrument approach procedure and therefore has no missed approach segment. If a go-around is necessary for any reason, aircraft operating at controlled airports will be issued an appropriate advisory/clearance/instruction by the tower.