Originally posted by aslyfox hmm, based on that
blank stare seems to fit
The visual-brain mechanism in a frog that lines it up to grab food with its tongue is, IMHO, even more fascinating. In brief, it's as if each eye had a graduated neutral density filter over each eye, dark around the periphery grading to clear at the center. The frog cannot rotate its eyes to any significant extent, so to change what is seen through the clear area of both eyes, it must rotate its body and/or tip its head. When an object is seen through the center clear area of both eyes simultaneously, it's at the precise point the frog can strike with its tongue.This explanation uses an analogy. The eyes + brain actually work with graduated resolution, not a brightness/darkness mechanism