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Eye See

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Build an eye with all its different parts.

Parts of the eye

The front part of the eye is the cornea; this tough clear film is sensitive to foreign bodies and also bends the light as it enters the eye. We then come to the iris, the coloured part of the eye. The iris controls how much light enters the eye. The light then travels through the lens which focuses the light. It then travels through the vitreous humour, which is the gel in the middle. The light is then focused on the retina where we find cells called rods and cones. The rods and cones are light receptors - the rods are sensitive to dim light as well as black and white whereas the cones are sensitive to colour. Finally we reach the optic nerve, which sends this information to the brain.

Depth perception

We have what is known as stereoscopic vision- because our eyes sit side by side, each eye captures a slightly different view. When signals from the two eyes reach the brain, they are superimposed and processed into a single picture with depth. As a result, we get a 3D picture and are able to judge distances. when light enters the eye it is refracted (bent) by the cornea and lens so that the light comes into focus on the retina. Most prey species (such as rabbits) have monocular vision - their eyes are on each side of their head. This gives them a greater field of view, which is useful for spotting predators. This does however come at a cost: they have poor depth perception.

Exhibits like this

Nearby exhibits

Look Closer

Welcome to Look Closer, Techniquest's brand new digital tool. We're trialling Look Closer as a way of offering you a closer look at the science demonstrated by many of our exhibits. You'll find visitor sheets, videos, articles on contemporary science as well as fun trails to navigate your way around the exhibition space.

Speak to our Science Communicators to find out more.