What is a Visual Approach?
A visual approach is an approach by an IFR flight when part or all of an instrument approach procedure is not completed and the approach is executed with visual reference to terrain. To expedite traffic at any time, IFR flights may be authorised to execute a visual approach if the pilot reports he can maintain visual reference to the surface and the reported cloud ceiling is not below the initial approach level.
When transferred by approach, the aircraft should have visual reference to the ground and have been provided with standard separation. As the aircraft are not following an instrument approach, they are unpredictable as to when they will turn onto final. You should take this into account when integrating departures.