How do I select vertices that are directly under the other? I'd like to select vertices that are directly beneath the one I am selecting to save me the trouble from moving out of ortho view. It's mostly on simple shapes like the cube below.

Notice how the first image has two vertices selected. However, if the other side is not.

N http://puu.sh/kg0oN/a618eee709.png

I want to be able to select vertices like so without coming out of ortho mode:



Is there a way to do this?
In edit mode disable Limit Selection to Visible.



An alternative approach is to switch to Wireframe Mode with the Z key.



Blender 2.8

In 2.8, these tools have changed location: