How does the human eye work?
Sight - key words
Iris - Coloured circle around the pupil. It controls the size of the pupil
Pupil - Black part of the eye. This is an opening that lets light in
Lens - This focuses light onto the retina
Retina - Light-sensitive layer at the back of the eye. It is made up of rods and cones
Rods - Sense cells that help us see the shapes of things
Cones - Sense cells that help us see colours
Optic nerve - Carries messages from the retina to the brain. The brain turns these into an image of what we are looking at