Describe the process of image formation on the retina?

Light from the thing > Cornea > Pupil is setting the light from the thing, if the light darked the pupil is smaller, if lighted, pupil is bigger > Iris is starting to give colour of the thing > Lens is setting the light is exactly drop to retina > retina is transfer the image of thing to brain through the other system in the eye. If the light drop behind or infront, the eye is not in good condition.