I've played Lee Sin myself, he is one of my favourite champions to play, and while playing him I have noticed something that doesn't seem right.
Now I'm sure we all know Lee Sin is the Blind Monk, and I think I speak for many when I ask:
How can Lee Sin have Blind applied to him if he already is?
Teemo's blind dart affects him and causes him to miss attacks, I don't see why if he is already blind.
Graves' Smoke screen disables him to see the surrounding area.. he is blind, why should that affect him?
Nocturne's ultimate disables him from seeing his allies, he can't see them anyways?
Would it be possible for Lee Sin to have a hidden passive that makes him invulnerable to blinds? It doesn't fit if he can be blinded while already being blind.
About the Nocturne ult, that was just an example, I'm not complaining about that. Just using as an example.