Terry Byland tests his experimental retinal implant outside and in sunlight for the very first time.

Inspired by the success of cochlear implants for the profoundly deaf, many researchers are now trying to develop artificial retinas for those who are blind due to retinal diseases. Alan visits the team at the Doheny Eye Institute of the USC Medical Center in Los Angeles, where he meets Terry Byland, one of only six patients testing an experimental retinal implant. Alan watches as Terry's artificial vision — "a white flickering fuzzy light" — is tested, and tries out for himself some simulations of how future retinal implants may one day allow the blind to read.