To see no vertices:
1. To turn off all vertices, use Ortho drop down on the main bar (Below the title bar) and uncheck Vertices. If you now push the vertex button (Left control panel) you may select a single vertice without seeing any others (Will not appear until it is selected).
To unselect a single vertice
2. If you have all the vertices alight (Vertice checked in the drop down) and have selected one (Or many) to unselect it simply click outside the bounding box and you will deselect.
To select and unselect a large number of vertices.
3. If you are saying you want to see only a selected area, follow the step given in step one, except drag over the area whilst holding the left button down. Follow step 2 to unselect
