Scientists from Johns Hopkins University have produced corneal tissues in the laboratory, opening the possibility to treat both macular degeneration and color blindness so that patients can see blue, red and green. The trigonometric view of these colors is a distinctive feature of humans from the rest of mammals.

According to the Johns Hopkins University site, researchers discovered that the blue-detecting cells were formed for the first time, followed by green and red cells, and it was found that thyroid hormone plays an important role in the molecular switching of cells.

This scientific shift allows further research to study human evolution at the cellular level.