Eyes in different systematic groups including arthropods, molluscs and
vertebrates probably have a common evolutionary origin. As a conseque
nce of this, related genes are used for regulation of the early steps
of eye development in different organisms. In this review, I briefly s
ummarize data on three gene families which might be essential for eye
development across species: Pax-6/eyeless, Eya/eyes absent and Prox/pr
ospero with emphasis on our contribution here. Mechanisms of eye forma
tion and the generation of different types of eyes in the course of ev
olution are discussed.