This comprehensive study of the developmental biology of the ocular lens will serve as a reference for graduate students and research scientists in the visual sciences and developmental biology, as well as for ophthalmologists. Clarification of the mechanisms that govern normal lens development is fundamental to our understanding of lens disorders. The lens has also become a model for studying more complex organ systems. Leading experts in lens development and structure discuss lens induction, evolution, cell cycle regulation, morphology, fiber cell differentiation, and regeneration.