If we recall on this page you see Itachi give part of his power to naruto which is obviously a part of the mangekyou sharingan.
And in this page you see Itachi doing to sasuke which we learn later to be that he is transfering ameratsu to him.
After giving away all of his mangekyou sharingans powers Itachi's eyes are left completely powerless. We already know that sasuke is going to be blind from the Mangekyou, which we all know sasuke has.
So when sasuke transfers his brothers blind eyes Sasuke is going to be left with a powerless EMS that can't do zit.
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And in this page you see Itachi doing to sasuke which we learn later to be that he is transfering ameratsu to him.
You must be registered for see links
After giving away all of his mangekyou sharingans powers Itachi's eyes are left completely powerless. We already know that sasuke is going to be blind from the Mangekyou, which we all know sasuke has.
So when sasuke transfers his brothers blind eyes Sasuke is going to be left with a powerless EMS that can't do zit.