How much can a person see through a retinal implant with sixty electrodes? · Grey Matter

At best a grid of sixty spots of light, and in practice less, because current from an electrode on the retina's surface also excites the axons passing beneath it, so many spots are drawn out into streaks.

How much can a person see through a retinal implant with sixty electrodes?

At best a grid of sixty spots of light, and in practice less, because current from an electrode on the retina's surface also excites the axons passing beneath it, so many spots are drawn out into streaks. In the Argus II trial nearly everyone could find a bright square on a screen with the system on, more than half did better at telling the direction of a moving bar, and the best acuity measured was 20/1260. That is enough to find a door, a window or a line on the floor, and not enough to recognise a face.