África Díaz Sánchez-Beato

 Introduction  The eye and the vision  Parts of the eye  How the eye works  Video

 Your sense of sight lets you see things with your eyes. Your eyes can detect information about the shape, colour and location of things around you.

 Although the eye is often called the organ of vision, in reality, the organ that makes the process of vision is the brain. The function of the eye is to translate light vibrations into nerve impulses that are transmitted to the brain through the optic nerve.

 The cornea: is a transparent layer of cells. It covers and protects the iris and the pupil.  The iris: is the colored part of the eye, around the pupil. It’s made of muscle fibres that open and close the pupil.  The pupil: is a small hole that lets light into the eye.  The lens: is behind the pupil and the iris. It focuses light on the retina.  The retina: has got a thin layer of optic cells that detect light and colours. These optic cells send information to the optic nerve.

The eye works like a simple camera. 1. Light goes into the eye through the pupil. Then it passes through the lens. 2. The lens proyect an upside down image onto the retina. The optic cells in the retina detect the light and colours. Then they send nerve impulses to the optic nerve. 3. The optic nerve transmits the nerve impulses to the brain. Finally, the brain interprets the impulses. It also turns the image the right way up again.

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