That’s a good question, and if you’re referring to the book I think you are that was a tough one for me when I was thinking about it.
Where I came down ultimately was whether or not the disability required some level of adaptation in day to day tasks for a non insignificant passage of time.
The D&D artifacts The Eye of Vecna and The Hand of Vecna are good comparisons. Both require removing the corresponding body part to use, but if you replace your original one with the artifact immediately after removing the corresponding body part and you have similar functionality as you did before but now with extra abilities; the you never really need to learn to adapt to the loss. Now if a character had been born blind and later gained the Eye of Vecna, they would gain sight, but would have had a significant experience of managing without it.