Researchers have demonstrated that optogenetic gene therapy, a technique recognized by the 2026 Nobel prize in physiology or medicine, can safely restore partial vision in people with blindness. The approach was initially shown to work in a single patient in 2021 and has now been evaluated in a larger trial including that original participant plus nine additional subjects.
All trial participants had advanced retinitis pigmentosa, a group of genetic disorders affecting over 1.5 million people worldwide. This condition causes light-sensitive cells in the retina to gradually lose function, though ganglion cells that transmit visual information to the brain deteriorate more slowly. Researchers targeted these surviving ganglion cells as candidates for treatment since they are not primarily affected by the disease.
The treatment involves a single eye injection containing a harmless synthetic virus that delivers instructions for producing a light-sensitive protein in a ring of ganglion cells. Patients then receive specialized goggles that capture images and convert them into pulses of light at a single wavelength, activating the treated cells to enable perception of monochrome images. The technique does not depend on the specific genetic cause of vision loss.
Following treatment of the eye with worse vision, six of the ten participants showed clinically meaningful improvements in light sensitivity. Some patients demonstrated improvements in various tasks while wearing the goggles, including detecting and locating objects, and navigating spaces. Participants who spent more time training with the goggles generally performed better. Only one severe eye-related side effect occurred, resolving within minutes, with no systemic side effects reported.
Researchers noted current limitations, including inability to detect faces due to the ring-like arrangement of treated cells around the fovea. The team indicated their aim is to work toward restoring higher-resolution vision within five to ten years. Outcomes were followed for up to five years in the published study.
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