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The adult eyeball is about 2.5 cm in diameter. The eyeball is held in place by six extrinsic muscles, which allow the eye to be moved. The front surface of the eye is protected by the eyelids and the eyelashes. The reflex action of 'blinking' protects the surface of the eye. Under the eyelids is a thin transparent layer called the conjunctiva. This is kept moist by secretions from the lachrymal glands (tear glands) which lie above and to the outside of each eye. The fluid contains the enzyme lysozyme which kills bacteria. After passing over the conjunctiva, it drains from the eyes into the nasal cavity. The eyeball has a three layered structure. Structure of the eye Iris - regulates the amount of light entering through the pupil. Iris is a continuation of the choroid. Pigmented, colour of eye. WALL OF EYE IS COMPOSED OF THREE LAYERS: (a) Sclera Sclerotic - outer...

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