ABSTRACT
On the other hand, suppose he translates his eyeball sideways by .1 mm, say by moving his head. The point on the edge of his iris will undergo exactly the same movement as it did for the lho rotation, but the subject will now be looking at a point only .1 mm from his original ftxation point. So, if someone is looking at a scene 10 m away and you look at the front of his eye and see that it moves .1 mm, you don't know whether he is now looking .1 mm from where he used to be or 100 mm from where he used to be or anywhere between those two. In fact, he might be looking at a point 200 mm away, having made an angular rotation one way and a translation the other way.
