It's not the gray part that's the problem. It's that you forget who you are.

[She tilts her head at her, frowning a little to see her eyes. One of her best friends is also blind, but her eyes are bright red from it, not like Toph's at all. It's not too hard to realize what the problem is, though.]

You can't see? You can set the bracelet to talk to you, I think! Do you want me to try?