When evolution skeptics want to attack Darwin's theory, they often point to the human eye. How could something so complex, they argue, have developed through random mutations and natural selection ...

Nocturnal animals tend to have proportionally bigger eyes than humans do. They also tend to have pupils that open more widely in low light. So, at the outset, nocturnal eyes gather more light than ...

Chapter 1, "The formation of the human eye," focuses on overall eye embryology, whereas most of the other chapters have sections that explain the ontogeny of the individual parts of the eye.