Scientists have restored vision in mice with retinal degeneration by transplanting stem cells at a specific stage in their development. Restoring vision in humans with RP and macular degeneration through a similar process is still years away, according
to the researchers, but human clinical trials have already started. Shown here: “Precursor” photoreceptor cells have been stained green and introduced to the layer of retinal nerve cells (in red) that transmit visual information.