To Simulate Vision
1. Click > 
Look At. The Look At dialog box opens.
Look At. The Look At dialog box opens.2. If there is more than one manikin in the scene, select a manikin.
3. To define the target for at which the manikin looks, with the Target Point collector, select a datum point, coordinate system, or vertex.
4. A constraint is automatically created when the Create constraint check box is selected.
If you do not want to create a constraint, clear the Create constraint check box.
5. Click OK. The manikin looks at the selected target, and a Line of sight Look At constraint appears under the 
Manikin Constraints node of the Manikin Tree.
Manikin Constraints node of the Manikin Tree.Video
See Look At use cases in a video.