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Understanding how your eye works

Your vision is a precious and essential part of your life, and your eyes are marvellous, complex instruments. In fact, your vision is made possible by the interaction of many components.

	A curved dome of strong, clear tissue on the surface of the eye, the cornea focuses light on to the retina.				The epithelium provides a thin protective layer for the cornea and heals very quickly when disturbed.				The coloured part of your eye is actually a muscle that controls the size of the pupil.

			The black circular area in the middle of the eye controls the amount of light reaching the retina.
			A membrane on the inner wall of your eye, similar to the film in a camera, the retina changes light into images that are transferred to the brain via the optic nerve.

	The outer white coat of the eye, the sclera also provides protection.				A natural lens behind the pupil changes shape to allow the eye to focus. As you age, your natural lens hardens, resulting in presbyopia - the loss of reading vision.

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