Isn't T-Rex's sight based on movement
Jurassic Park, known for its scientific accuracy. What next, velociraptors that are two to three times the size of the real thing? Can't really imagine why they came up with that funny idea, except that you could build a cool set-piece scene around it (although, at the distance depicted in the scene, the T-Rex with its Xbawks HUEG olfactory organs could certainly have used its smell to locate the humans even if it had been totally blind).
Unlike most lizards or even other predatory dinosaurs, T-Rex has forward-facing eye sockets and the snout narrows enough so that it's not in the way. It would have had binocular vision and would certainly have seen objects three-dimensionally even if they were not moving. Which would also suggest that it did hunt actively, at least to some degree. Carrion-eating and/or chasing smaller predators away from the carcass do not require a particularly good stereoscopic vision, so there would not have been selective pressure to evolve such.
On the other hand, we need to be able to test that to verify the hypothesis. Let's clone one to find out! FOR SCIENCE!