The eye is a sense organ that allows us to see light. It works in a similar way to a camera. Light enters the eye through the lens and an image is formed on the sensitive retina. 

What will you see using the giant eye ball? 

What is the difference between the real view and the image on the paper? 

How do your eyes change in the dark?

 

 Three parts of the eye focus the light that enters the eye, they are the cornea, fluid within the eye and the lens. The muscles around the lens, called ciliary muscles, act to change the shape of the lens so objects of different distances can be focused upon. Objects we see are focused on the retina; this is full of light sensitive cells and is connected to the brain through the optic nerve. This optic nerve sends the ‘message’ through impulses to a part of the brain called the visual centre. The visual centre in the brain enables us to recognise and react to what we see. 

The brain has to learn to correctly interpret the impulses received from the eye. The lens actually transmits the object it focuses on upside down, just like a camera.

The brain also controls muscular movements of the eye including the opening and closing of the iris, ciliary muscles around the lens (these are all reflexes) and the movement of the eyeball which is a voluntary movement.

 Ourselves

 Light and Dark

 How we see things