Unfortunately, Dr Grant was wrong, and this theory only comes from Jurassic Park and is not accepted at all in paleontology. 

I will use [this article][1] , but there are a lot similar on the web that answers the same question.

The T-Rex has a very developed sense of smell, so the "don't move" theory is already broken by that fact.  
Furthermore, he has front-facing eyes, and his binocular range was 55 degrees which is actually greater than that of a hawk.

You can find other crispy details in this article if you want some more infos!


  [1]: http://www.iflscience.com/plants-and-animals/could-t-rex-really-only-see-you-if-you-moved