Eyeline Match.

Eyeline match occurs whens people are having a conversation or where someone is looking at an object and then you see what he is looking at. At this point the camera has to match with what the person is looking at in order for the shot to be successful. An example is below;

An eyeline match is a film editing technique associated with the continuity editing system. It is based on the premise that the audience will want to see what the character on-screen is seeing. The eyeline match begins with a character looking at something off-screen, followed by a cut to the object or person at which he is looking. For example, a man is looking off-screen to his left, and then the film cuts to a television that he is watching.