How Can the Eye See Things?

In the middle of the eye there is a pupil. When a person sees things, the light and colour of the things reflect into the eye through the pupil. The pupil is changeable. When a person sees bright things ,the pupil becomes smaller ,and at night the pupil becomes larger. Inside the eye there is a crystalline lens which functions like a magnifying glass . It can gather the light and then reflect it onto the membrane of the eyeball. The membrane contains a lot of cells which are especially for seeing things . These cells transmit the images to the brain . At last the person can see these things.