Light from the object is refracted by the cornea through the aqueous humour, iris and pupil onto the eye lens. The eye lens focuses the image through the vitreous humour onto the retina. These images are received by the light sensitive cells of the retina and they transmit the impulses to the brain through the optic nerves.
The ciliary muscles change the shape of the lens and adjust the focal length according to the distance of the objects. Normally the focal length of the eye lens will be about 2.5cm.
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