How We See

How We See

Author: Nancy Esslinger

This lesson will introduce you to the anatomy and physiology of the human visual system, its connection to the brain and how this system processes light.

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Visual Communications

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  • Rods

    The long, thin light sensitive parts of the retina that processes night vision.

  • Cones

    The light sensitive parts of the retina that processes color and day vision.

  • Retina

    A thin, transparent tissue at the back of the eye that contains light sensitive receptors called rods and cones.

  • Visual Cortex

    The part of the brain which processes visual information from the retina, communicated via a network of nerve cells.

  • Optic Nerve

    Tissue that connects the retina to the visual cortex in the back of the brain.

  • Wavelength

    The measure of the distance from two consecutive waves crests or troughs, common measured in nanometers.

  • Frequency

    The number of waves passing a certain point per second, measured in hertz.

  • Electromagnetic Radiation

    Another name for light; the human eye is only sensitive to a portion of it, known as visible light.