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:Arboreal life and the evolution of the human eye - a revised publication of the Bowman lecture delivered before the Ophthalmological Society of the United Kingdom in May, 1921 (1922) (19723071026).jpg - Wikimedia Commons
File:Diagram of eye evolution Norwegian version.svg - Wikimedia
BIL 360 - Lecture 11c
Chapter 15: Concept 15.2
Homologies at different levels - Understanding Evolution
Evolution of EYE
Evolution of the eye - Wikipedia
Visualizing the Evolution of Vision and the Eye
The Poor Design of the Human Eye – The Human Evolution Blog