Topher, Dr. Saunders and others in “True Believer”

The actual procedure isn't any more complicated than laser eye correction, it ain't brain surgery.

Actually, it is brain surgery. We're going to be turning Echo into a human camera, and in order to do that, she's going to have to be made blind.

Not permanently. [Dr. Saunders shoots him a look] In theory.

So this is it?

Yes. The latest in CSEVP: Cortical Stimulation for Evocation of Visual Perception.

Brain camera for the blind.

Or that.