Re: How much eye functionality does this require?
I'm sorry to hear of her accident too. I was going to write exactly what 1980s_coder did.
All we really know is that it is hard to guess the rate of technology. It might be the case, in a few years time, that this technology is improved in every way, and can be usefully deployed in in people who still have the use of one eye. It could be used to display a zoomed image, or an infra-red image, for example.
As prosthetics, glass eyes have been with us for centuries. A prosthetic eye would be the ideal housing for the auxillary parts of this system, namely the optics, IR transmitter and battery. Cosmetically, this would be better than any existing glass eye, because by necessity a system would have to be developed to keep it aligned with the user's other eye.