Fig. 1From: Charting Evolution’s Trajectory: Using Molluscan Eye Diversity to Understand Parallel and Convergent EvolutionSchematic drawing of two common eye types found in molluscs. An open pit eye in a does not have a lens or cornea and is open to the environment through an opening in the optical cup (OC). The closed lens eye in b has both a lens (L) and a cornea (CO). Both eyes have optic nerves (ON), photoreceptor cells (RC), and pigment cells (PC)Back to article page