The invertebrate with different eyes structure are shown through four different photographs with labeled text:

• Planarian
  • Eyespot: Some animals have eyespots, which are groups of cells that can detect changes in the amount of light (LM 50x).
• Scallop
  • Simple Eye: The 40-60 simple eyes of a scallop do not form images. They do, however, detect movement well enough to enable the scallop to escape its predators.
• Mosquito
  • Compound Eye: The compound eyes of arthropods are made up of many lenses that detect minute changes in movement and color but produce less-detailed images than human eyes do.
• Squid
  • Complex Eye: Octopi and squid have eyes as complex as fishes and humans, though their structures differ.