Steps in the evolution of the eye as reflected in the range of eye complexity in various living mollusk species.

ANIMAL • ANIMALS • AQUATIC • BIOLOGICAL • BIOLOGY • CIENCIA • COMPLEX • COMPLEXITY • CORNEA • DEVELOPMENT • DIAGRAM • DIVERSITY • EPITHELIUM • EVOLUTIONARY • EYE • EYEBALLS • EYES • FIBERS • FIGURE • ILLUSTRATION • ILLUSTRATIONS • IRIS • IRISES • LAYER • LENS • MARINE • MOLLUSC • MOLLUSK • MUREX • NAUTILUS • NERVE • OCTOPUS • OPTIC NERVE • OPTICAL NERVE • OPTICAL • PHASES • PHOTORECEPTION • PHOTORECEPTOR • PHYSIOLOGICAL • PHYSIOLOGIE • PHYSIOLOGY • PIGMENT SPOT • PRIMITIVE • REFRACTIVE • RETINA • RETINAE • RETINAS • SCIENCE • SIMPLE • SNAIL • SPANISH VERSION • STADIUMS • STAGES • VARIETY • VISION • VISUAL • ZOOLOGICAL • ZOOLOGY