I could be mistaken, but if I remember correctly, Jackie testified or perhaps just said something like the following to someone else who reported it: He had a quizzical look in his eyes. So I question the idea that his eyes were closed.
Hi Charles. I agree. In Frme 237,(posted here by Michael Welch, President Kennedy was squinting because of the pain after the first shot ripping through his back and exiting his throat. He couldn't have gone unconcious before the fatal shot. Otherwise, he would never be able to keep his arms in the position they were in as late as 312. When people lose conciousness, the body goes completely limp. He's still holding his right arm up to his chest area.