They appeared in an evolutionary blink and changed the rules of life for ever. Before eyes, life was gentler and tamer, dominated by sluggish soft-bodied creatures lolling around in the sea.
File:Diagram of eye evolution el.svg - Wikimedia Commons
The Evolution of the Eye!!! - ppt video online download
Evolutionary Novelties: Textbook linear evolution
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Eye evolution at high resolution: The neuron as a unit of homology - ScienceDirect
Evolution of the uniformly white sclera in humans: critical updates: Trends in Cognitive Sciences
Chapter 15: Concept 15.2
Adaptation
Evolution of the eye - Wikiwand
Evolution of the eye - Wikipedia
Homologies at different levels - Understanding Evolution