This shark can live 400 years. Its eyes barely seem to age

Researchers at UC Irvine, the University of Basel, and the University of Copenhagen examined Greenland shark eyes and found the sharks maintain healthy retinal tissue and active light-sensing proteins across centuries despite living in near-darkness and often carrying parasites on their eyeballs. A DNA repair mechanism appears to preserve eyesight without retinal degeneration. The findings were published in Nature Communications.

The discovery offers potential clues for human vision protection; translation to human therapy would require further research.