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How the Eye Works

The Eye

Crash course on the EYE.

  • The eye is the only organ of the body that you can see into without having to cut it open or stick a tube into!
  • Approximately 80 percent of everything we learn comes through our eyes.
  • The eye contains over two million working parts and is considered the second most complex organ in the body— the most complex is the brain.
  • The optic nerve is critical to your vision. It’s an extension of your central nervous system, which includes your brain and spine. The optic nerve transmits electrical impulses from your eyes to your brain.

The eye works much like a camera.

  • Both have a lens or lens system.
  • Both provide a way to collect incoming light.
  • Both provide an image that must be interpreted by the brain.

Our brain works together with our eyes to process the information we see and transform it into recognizable images. The clear disc-like part of the eye called the lens helps to focus light on the retina. The ciliary muscle adjusts the shape of the lens, helping it to focus on objects at different distances. This automatic focusing is a reflex response and is not controlled by the brain.

Once the image is clearly focused on the sensitive part of the retina, the energy in the light that makes up that image creates an electrical signal. Nerve impulses can then carry information about that image to the brain through the optic nerve, which is a collection of more than a million nerve fibers. As the cornea bends light when it enters the eye, the brain receives images that are upside down, so it turns them the right way up when it processes the information.

We can “see”!  Yes, vision is a great deal more complex than this, but you get the point.