What can box jellyfish tell us about early eye evolution?
The eyes of visually prominent animals such as vertebrates, cephalopods, and arthropods generally subserve a multitude of visual tasks. Naturally, early stages in the evolution of these complex visual organs must have been simpler, and subserved a smaller number of visual tasks. Hence, eye evolution is driven by a consecutive accumulation of visual tasks. Each task adds to the requirements on eye