More than once she tracked motion with her eyes. I can't think of any worse way to invalidate such a performance.
Actually, I'd disagree with that assessment, personally. IME and to my knowledge, total blindness is a rarity among visually impaired people. Most blind people can still discern some degree of light, and thus motion tracking wouldn't be all that rare. That's one of my main issues with how blindness is portrayed by actors- that they go for the "total blindness" angle, and stare off into space as if that's the only way they can possibly convey how the visually impaired act. I guess it's just easier shorthand than actually doing some research into things.
In any event, this episode was just... okay, like most of the others. I'm far from blown away by Dollhouse thus far. I'm sticking with it mainly because there's nothing else to watch, really, and I'm hopeful that it will pick up. There are a couple of decent characters that are being wasted (Sierra, for one; Dichen Lachman has been great whenever they give her more than two seconds of air time).
The FBI agent plot is just plodding- let's drop a hint here or there, but immediately pull the football out before he kicks it. Hee, hee. (That just gets old, real quick). I'm curious though- I think we were told that Alpha was a male, but has it been explicitly stated that was the case? Because FBI Agent's neighbor has "Dollhouse" written all over her.
I'm also tired of Olivia Williams' constant monologues. Her character is so over the top loquacious that I wouldn't be surprised to see her turn out to be an imprint too.