For the first time, an artificial retina is being sold in the US and 100,000 people there could benefit from it.
The retina does not provide true sight, but it allows people to see points of contrast, making it easier to identify obstacles.
The gift of restored sight does not come cheap.
Implants cost more than $140,000 and few insurance companies have agreed to cover them.
Al Jazeera's Jacob Ward reports from California.