books.google.com.ph - Ten distinct eye designs have been identified in the animal kingdom. Whereas vertebrates possess only one, invertebrates possess all ten, from simple assemblies of photoreceptors to advanced compound and camera eyes, which support a sophisticated range of visual behaviours. Many invertebrates have exquisite...http://books.google.com.ph/books/about/Invertebrate_Vision.html?id=s0oQx7IYiO0C&utm_source=gb-gplus-shareInvertebrate Vision
