How do I hide vertices not visible to the camera? I'm following a character modelling tutorial, and I noticed that the face of my character appears different to how it is in the video - I can see the vertices which are hidden to the camera, as if the material were translucent. Here is a screenshot of what I mean (in the right frame):



In the video, it appears in the following manner:



As you can see, none of the vertices which are hidden from the camera are visible. How can I achieve the same appearance in edit mode? I tried enabling backface culling although this did not work.
As per moonboots's comment, I had disabled Limit Selection to Visible, so I just needed to toggle this.