A patient with complete blindness caused by irreversible optic nerve damage partially recovered natural vision after participating in a clinical trial of electrical stimulation of the visual cortex conducted by researchers from the Universidad Miguel Hernández de Elche (UMH) and the CIBER in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN). The unexpected improvement was spontaneous, sustained over time, and independent of the implanted device.