You should be able to name the following parts of the eye, and know what their function is: Iris, Pupil, Lens, Sclera, Cornea, Retina, Choroid, Macula lutea, Optic disc (blind spot), Optic nerve, Vitreous body.
You can explain how your eyes are being protected by your eyebrows, your eyelids and your eyelashes.
You can describe tears being formed in the Lacrimal glands and the tears being wiped across the eyes by the eyelids.
You can describe the following terms: accomodation, near-sightedness (or short-sightedness), far-sightedness (or long-sightedness).