British experts say they have restored the site of blind mice by injecting light-sensing cells into their eyes.
A team from Oxford University say the mice were able to differentiate between light and dark after the procedure.
The BBC reports that the researchers injected "precursor" cells which develop into the building blocks of a retina once inside the eye.
The findings were published in the Proceedings of the National Academy of Sciences journal.
Prof Robert MacLaren said: "We have recreated the whole structure, basically it's the first proof that you can take a completely blind mouse, put the cells in and reconstruct the entire light-sensitive layer."
Prof Pete Coffee, from the Institute of Ophthalmology at University College London, told the BBC said the findings were important as they looked at the "most clinically relevant and severe case" of blindness.
Other researchers have had similar success, the BBC reported.
Prof Robin Ali published research in which transplanted cells restored the vision in night-blind mice and that the same technique worked with mice with degenerated retinas.
Researchers are yet to determine the extent of the recovered vision and if it extends beyond just the difference between light and dark.