Horizon - Man and science today

Your eyes... are they... Windows of the soul? Receivers of irrelevant information? Respectable substitutes for sex? Something like footballs? Or a piece of the brain looking out at the world?
Some of the contributors to tonight's film suggest that they might be. But these are only a few of the ways in which man looks at his eye, and in spite of the detailed medical attention of many centuries, science is still breaking new ground and revealing new information about this remarkable organ.
Tonight's programme asks 'How important are eyes?' It looks at some current research, at how electron microscopic discoveries are giving new information about the structure of the eye, and at the cause of the most common disease that can affect it.
(Colour)