In medical terms, the eye is not the window to the soul, but to the mind. The retina and the optic nerve are outgrowths of neural tissue, and the remarkable success of electronic implants in restoring sight shows how far brain-computer interfaces have come. These have not delivered a sci-fi vision of augmented humans with incredible new powers but, perhaps more happily, significant progress has been made, restoring ability and agency to those who have suffered injury or disease.
People with age-related macular degeneration face a fading world. The disease, affecting about 600,000 people in the UK, causes progressive loss of central vision. There is no cure, but new trials offer something else: a new way of seeing.
