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All About eyes

It is probably best to start with a brief explanation of how eyes work. The eye itself is much like a camera or video camera. It has a body (Stroma) to hold all its elements, a series of lenses (Cornea and Lens) to focus light, an aperture (Pupil) to limit the entry of light, a photosensitive film to receive projected images and convert them to an electrical signal (Retina), and a cable network (Optic Nerve) to send these electrical signals away for further processing and interpretation.

Once the electrical signals leave the back of the eye, they pass via the Optic Nerve, through the Optic Chiasm, down the Optic Tract, through the Lateral Geniculate Nucleus, down the Optic Radiations and finally end up at the Visual Cortex, just inside the back of your head.

The visual cortex is arguably the most important element of the visual system as this is the structure that gives rise to our perception of vision. This includes our sense of light and dark, colour, movement, distance, size, orientation, binocularity, balance and a whole range of other visual perceptual phenomena.

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