This article reports about this new discovery:

The ability of zebrafish to regenerate damaged retinas has given scientists a clue about restoring human vision and could lead to an experimental treatment for blindness within five years.

Further, the article tells us:

British researchers said on Wednesday they had successfully grown in the laboratory a type of adult stem cell found in the eyes of both fish and mammals that develops into neurons in the retina.

On the progress in research this is what was said:

The cells have already been tested in rats with diseased retinas, where they successfully migrated into the retina and took on the characteristics of the surrounding neurons. Now the team is working on the same approach in humans. “We very much hope that we could do autologous transplants within five years,” Astrid Limb of University College London’s Institute of Ophthalmology, said.

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