I saw this post before you added the bit about him losing his eyes , so you must have thought about it for a bit and the impulse/feeling was too strong. Not agreeing or disagreeing but I'm interested in what makes you think that ?
He's only 32 , im 39 and legally blind without glasses but manage to face 80odd mph reasonably ok for an old bugger ....so if his eyes are gone its very young for that to happen .
I've got dodgy eyes too, long story
I think, at this level, the eyes have to be perfect when your used to picking the ball up at this pace
And Cooks a very good player of pace
I've noticed with his fielding too, he's been late on catches
I really really hope I'm wrong as I've loved watching him bat, and we need a world class opener