Of course, Steve Mann's telepointer helped define the field of AR! If you (a user) do think that screen size is too small, it is possible to take the approach

Of course, Steve Mann's telepointer helped define the field of AR! If you (a user) do think that screen size is too small, it is possible to take the approach of having large, opaque screens that show the entire scene, so none of the real light makes it through. For example, imagine a helmet that has two screens inside, which are showing a heavily augmented version of the video streams from a pair of plenoptic cameras (lytro.com) that are mounted on the front of the helmet.