## Step2

Anatomy of the human eye

Study the following:

Eye lid - a thin fold of skin that covers and protects the human eye Tear duct - a tube that carries tears from the eye to the nasal cavity Sclera - also known as the white of the eye, is the protective outer layer of the eye, it is very tough Iris - the coloured bit of the human eye, it controls the amount of light that enters the eye Pupil - a hole located in the centre of the iris of the eye that allows light to pass through Cornea - the transparent part of the eye that covers the pupil and the iris Ciliary body - the part of the eye that contains muscles that control the shape of the lens, which makes you focus your vision Lens - light falls through the pupil into the lens, the lens then focusses the light so you can see clearly muscle - the muscles that control movement of the eye (eye muscles / ocular muscles) Choroid - the layer of the eye which contains the blood vessels, this is what you see when people have red eyes in a flash photograph Retina - this is the light-sensitive layer of the eye, this is where the sensory cells are located Macula lutea - the place on the retina with the most sensory cells, this is the place you see with then you focus on something Vitreous body - a clear gel that fills the space between the lens and the retina of the eye Optic disc (blind spot) - the point of exit for all sensory nerves leaving the eye, there are no light sensitive cells so this is your blind spot Optic nerve - the nerve that transmits visual information from the retina to the brain

After studying the picture and text above, do you know the anatomy of the eye?

Start the assignment: "anatomy of the eye"