Eye and the Camera

Lens

• bends light rays so that they form a clear image at the back of the eye – on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.

Pupil / Aperture

• the entrance of light.

Iris / Diaphragm

• changes the size of the pupil / aperture and allows different amounts of light to enter the eye / camera.

Retina / Film

• produces an image which is sent along the optic nerve for the brain to interpret, rather like developing a camera film.

Choroid / Dark internal Surface

• absorbs excessive light to prevent multiple images formation.

Difference

• their focusing mechanism

-camera changes the distance between the lens and the film.

-the human eye changes the focal length of lens using the ciliary muscles.