This is a really cool approach - I covered it yesterday and here's the EPFL news post as well.
https://techcrunch.com/2021/03/18/quest-for-prosthetic-retin...
https://actu.epfl.ch/news/retinal-implants-can-give-artifici...
Still lots and lots of work to do but it obviates the issues with previous retinal implants that you basically needed to run a cable into the eye. In retrospect photovoltaics are obvious because that's more or less how the eye works in the first place.