An electrical device implanted under the retina helps to restore some visual acuity to people with age-related macular degeneration.Credit: Science CorporationScientists have used an eye implant to improve the vision of dozens of people left functionally blind by age-related macular degeneration (AMD). The implant, which measures 2 millimetres by 2 millimetres, and is just 30 micrometres thick, is surgically inserted beneath the retina to replace the light-sensitive cells that have been lost to ...