He is having cataract surgery, so he will be blind, and not supposed to move his head around, or lift heavy things. You know, all the usual stuff.
This brings me to a pre-movie gripe. I was thinking we should see Pirate of the Carribean before he had the surgery, so he would be up on pirate speak, while he's wearing an eye patch. But I have since been informed that none of the pirates wear patchs in the movie. What's up with that?