Both cameras and the human ... The lens focuses light on the retina at the back of the eye. Because the front of an eye is curved, it bends light as it goes in, turning the image on the retina ...

Eventually, the light-sensitive spot evolved into a retina, the layer of cells and pigment at the back of the human eye. Over time a lens formed at the front of the eye. It could have arisen as a ...

It will be news to most optometry students that the eyes of scallops and shrimps use mirrors rather than lenses ... the eye is discussed in various ways. Chapter 1, "The formation of the human ...