"Implantable Telescope for the Eye":

The device is implanted in only one eye--patients use this eye for detailed vision and the untreated eye for peripheral vision. That takes some getting used to, says [vision scientist Eli] Peli. "Instead of using two parts of the same eye, they must switch between two eyes; if they see someone coming but can't tell who it is, they need to switch to other eye."

Here's the company website.