Marion
Hello there!
You didn't say what the learning disability is or how it affects this person, but would just put a few things to think about.
The eye would be covered with an eye pad at least overnight, and then having to wear an eye shield when sleeping for a while to let it heal, so as not to damage it. Regular eye drops would need to be given, and it is essential that the eye is looked at in regular check ups to make sure that it is healing well. There is also the time when the stitches will need to be removed. Most people just find this a little uncomfortable, but not really painful, but the important thing is that you need to be able to keep still while they are being removed.
If this person is already wearing contact lenses, then i would say that there is a good chance that everything will go ok, as they would be used to having their eyes seen and lenses being used.
But i guess that you would know how they handle this and would need to check in with the surgeon to see what they thought as well.
Hoping that everything goes well whatever you decide!
Sweet X x X