It connects to the back of the eye near the macula. Optic Nerve The optic nerve transmits electrical impulses from the retina to the brain. These light impulses are then sent to the brain for processing, via the optic nerve. Much like the film's role in photography. It is responsible for capturing the light rays that enter the eye. Retina The retina is a very thin layer of tissue that lines the inner part of the eye. It is composed of layers of blood vessels that nourish the back of the eye. Structure and Function of the EyeĬhoroid The choroid lies between the retina and sclera. Vitreous Three chambers of fluid: Anterior chamber (between cornea and iris), Posterior chamber (between iris, zonule fibers and lens) and the Vitreous chamber (between the lens and the retina) The first two chambers are filled with aqueous humour whereas the vitreous chamber is filled with a more viscous fluid, the vitreous humour.
Lens: Sight Defects Structure and Function of the Eye Lens: Focusing Light Structure and Function of the Eye The lens is encased in a capsular-like bag and suspended within the eye by tiny guy wires called zonules. The nucleus, the innermost part of the lens is surrounded by softer material called the cortex. Lens The purpose of the lens is to focus light onto the back of the eye. It is nourished by tiny blood vessels that are nearly invisible to the naked eye. It begins at the outer edge of the cornea, covers the visible part of the eye, and lines the inside of the eyelids. Like the crystal on a watch, it gives us a clear window to look through Structure and Function of the EyeĬonjunctiva The conjunctiva is the thin, transparent tissue that covers the outer surface of the eye. It is a powerful refracting surface, providing 2/3 of the eye's focusing power. The Cornea The cornea is the transparent, dome-shaped window covering the front of the eye. The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size. The round opening in the centre of the iris is called the pupil. It controls light levels inside the eye similar to the aperture on a camera. The Iris The coloured part of the eye is called the iris. Sclera The sclera, commonly known as "the white of the eye," is the tough, opaque tissue that serves as the eye's protective outer coat. Structure of the Eye Structure and Function of the Eye Camera like vision has evolved at least seven separate times through out natures history. Vision such as ours and animals are know as ‘camera’ like vision. Windows to the World Eyes are photosensitive organs designed to detect light and pass on the information as electrical signal to the brain. Be able to explain how rods and cones function. Be able to explain the function of the parts of the eye. Learning Objectives Be able to name the structures of the eye.
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