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Vision

Vision

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This lesson will examine the structure of the eye and will identify how our brain processes visual signals.

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Tutorial
TERMS TO KNOW
  • Vision

    The perception of light, images and movement by the eye.

  • Cornea

    A layer that covers the iris and helps to focus light into the eye.

  • Iris

    The colored portion of the eye.

  • Lens

    A structure in the eye that focuses light to the retina.

  • Retina

    An area in the back of the eye that contains photoreceptors to absorb light.

  • Visual Cortex

    The part of the brain that receives nerve impulses from the optic nerve.

  • Rod Cells

    A photoreceptor that detects dim light.

  • Cone Cells

    A photoreceptor that detects bright light.

  • Fovea

    An area of the retina where vision is the most acute.

  • Photoreceptors

    Cells that detect light found on the basement layer of the retina; includes rods and cones.

  • Vitreous Humor

    Fluid within the eyeball that supports the lens and the eyeball.

  • Aqueous Humor

    Fluid within the eyeball that maintains pressure and transmits light.

  • Sclera

    The white of the eye that aids in protection.

  • Pupil

    The black part of the eye through which light enters.

  • Optic Nerve

    A nerve that sends impulses to the visual cortex in the brain where images are interpreted.