[Mike Darancette]

T. rex might also have had a limiting far point of 6 kilometers, compared with the human far point of 1.6 km.

All the better to spot dead things with.

[Al Simmons]

"T. rex might also have had a limiting far point of 6 kilometers, compared with the human far point of 1.6 km. All the better to spot dead things with."

Nope. For that it had the most highly developed olfactory system of any terrestrial animal. Ever. Basically TRex was equipped to sniff out carrion miles away, as well as to see potential prey an equal distance away....nature maximized its ability to find/capture food...no wonder it had no competition from any other large Theropods in its environment...