Abstract
What is convergence? Consider your eye and that of an octopus. Both are built based on the camera principle, yet you are closely related to a starfish while the octopus is a near cousin of the oyster. The common ancestor of you and the octopus lived about 550 million years ago and at most possessed a simple eye-spot. Regarding the eyes, vertebrates and molluscs have arrived at the same solution, and in doing so have solved equally successfully problems such as how to correct spherical aberration.
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