Eyes came before limbs in the transition to land

The transition to land from our fishy ancestors is one of the most iconic, and best documented, transitions in the fossil record. We know that fleshy-limbed fish living in shallows used their limbs to move in the shallows and then up onto land, and became tetrapods (4-legged vertebrates) along the way. What has been less well-studied is the transition to vision in air that also occurred during that evolutionary event. Vision in air is different, and in some ways easier, than seeing in water. Acc