Maybe it just so happens to be the case that "vision" is a bit of a loaded term. And it just so happens that eyes and brains aren't necessary for a "living" detection of, and reaction to, stimuli.
For humans, part of the definition for that word "vision" involves the perception of what you see, and we require the eyes for sensing and the brain for perceiving. For jellyfish and other such simple organisms, it's a different story. And for other organisms, other different stories. It's not so clear cut black or white, after all.
For humans, part of the definition for that word "vision" involves the perception of what you see, and we require the eyes for sensing and the brain for perceiving. For jellyfish and other such simple organisms, it's a different story. And for other organisms, other different stories. It's not so clear cut black or white, after all.
