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The Eye

The Eye. Parts of the Eye (Outer). Vision interacts between outside light, the eye structures, and your brain. We are not really looking at the object, but instead we are looking at the reflection from the light of the object.

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The Eye

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  1. The Eye

  2. Parts of the Eye (Outer) • Vision interacts between outside light, the eye structures, and your brain. • We are not really looking at the object, but instead we are looking at the reflection from the light of the object. • Step 1 – Light hits your cornea which focuses the image. Together with the Aqueous Humor they create the exterior lens. • Cornea – The curved outer surface of your eye. • Aqueous Humor- Watery fluid behind the cornea

  3. Parts of the Eye (Outer) • Step 2 – Light enters the eye through the pupil of the iris. • Pupil – A small opening that adjusts with the amount of light. • Iris – The wall that covers your lens but is open for your lens. • A pupil will adjust to a variety of lights. • The less light there is, the bigger your pupil. • The more light there is, the smaller your pupil.

  4. Parts of the Eye (Inner) • Step 3 – Once the light passes through the pupil, it becomes more focused at the lens. • Lens – A focuser that lies just behind the pupil. • Step 4 – Light then passes through the vitreous humor and projects onto the retina. • Vitreous Humor – The jelly that fills the bulk of the eye. • Retina – A delicate tissue filling the back half of the eye which light is reflected upon.

  5. Parts of the Eye (Inner) • Step 5 – The retina transforms light into electrical signals which travels to the brain through the optic nerve. • Optic Nerve – a tough white cordlike structure connecting the back of the eye to the brain. • A cow eye, and a human eye have a lot of similarities…but few differences.

  6. Video of a Cow Eye Dissection http://www.exploratorium.edu/learning_studio/cow_eye/step01.html

  7. Safety Warning You will be using a scalpel or a razor to cut the cow’s eye. Be careful. A scalpel or razor can cut you as easily as it cuts the cow’s eye. Whenever you handle raw meat (whether it’s a cow’s eye or a steak), you wash your hands thoroughly afterward to wash away any bacteria you picked up from the meat. If you have cuts on your hand, we also recommend you wear gloves so that no bacteria from the cow’s eye infects your cut.

  8. Human vs. Cow Eyes • Human Eyes • Pupils are round. • No tapetum in a human eye. • Tapetum – a second lining that helps you see better in the dark. • Cow Eyes • Pupils are oval. • A blue-green tapetum is present in a cow eye helping it see better at night. • This usually reflects light better making their eyes more shiny when light is flashed on them, like a cat eye.

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