Fish eyes may hold the key to a cure for blindness in humans, scientists claim.
In a study on zebrafish, experts identified a trigger that could reverse age-related macular degeneration.
This condition, the leading cause of vision loss around the world, occurs when the retina becomes damaged.
Reducing levels of a brain chemical helps to regrow the affected area of the eye, new research shows.
And this process could happen before damage even occurs, preventing humans from ever needing glasses.