Fish Eyes. Any experts on fish eyes?

The anatomy, histology, circuitry and biochemistry of the eye are strikingly conserved among most classes of vertebrate. Not surprising, therefore, were the observations that development of the eye also proceeds in very similar manners. The eye develops from no less than three distinct embryological tissues, neuroectoderm which gives rise to the neural retina, pigmented epithelium, optic stalk and ciliary margin; skin ectoderm, which is induced to form the lens and subsequently the cornea; and head mesenchyme of neural crest cell origin that minimally forms connective tissue of the cornea and sclera. The highly conserved mechanisms of development and function have contributed significantly to our overall understanding of visual processes and led to rapid advances in understanding the basic mechanisms of diseases.