How your Eyes Work
In order for us to see, light has to enter the black spot in the middle of our eye, called the pupil. The pupil changes sizes with the help of the coloured ring around the edge of your pupil, known as the iris, which is a muscle. By opening and closing the pupil, the iris can control how much light enters the eye. If light is too bright, the pupil will shrink to let in less light, to protect the eye. If it is dark, the iris will open the pupil so more light can enter.
Once the light enters the eye, it passes through fluids and lands on the retina. The retina will then turn the light rays into signals that our brain will understand. The retina uses light sensitive cells called rodsand cones. The rods are extra sensitive to light and can help us see in the dark. The cones are to help us see colour. There are three types of cones that help us see different colours: Red green and blue, like the pixels on tv screens.
