1. HW # 34- Writing in Science (type if you can) Due Tuesday Warm up Name as many parts of the eye as you can. - Week 9, Day Three

2. Warm up Response W

3. Homework Response/Check Read your neighbor’s “CYFTD” lab conclusion. Give them some feedback (2 warm and 1 cool).

4. Eyes

5. The Human Eye! Window to the world!

6. 7 main parts of the eye Cornea Iris Pupil Lens Sclera Retina Optic Nerve Pupil Lens Iris Cornea Retina Optic Nerve Sclera

7. FYI:Look closely at the eye:

8. Sclera White of the eye Covers whole outside of eye Tough protective outer layer

9. Cornea Clear Covers iris Allows light to enter Protects Focuses Image to help make image clear (ex: coarse adjustment knob) This is where sclera becomes a clear window for the eye

10. Iris Colored part of eye Muscles open and close pupil Lighter colored iris lets in more light Darker colors protect more, less light enters eye

11. Pupil Hole in center of iris Lets light waves into eye Adjusts in size to light levels Light entering shines on retina

12. Lens Behind iris/pupil Focuses light waves (ex: fine adjustment knob) Makes images clear (See next slide for clear picture of lens)

13. Check out the eye

14. Vitreous Humor Jelly-like fluid that fills most of the eye (from the lens back) Helps the eye hold it’s sphere shape

15. Retina Back of the eye where light shines Like a movie screen Shows us what we see by sending information to the optic nerve.

16. An Actual Retina!!! 2 kinds of cells in the retina: Cones--see color Rods--see form and shape

17. Tapetum Lucidum Shiny blue-green color Reflects lights to allow more light to the retina Allows for better vision in dark environments

18. Optic Nerve Sends information from the eye to the brain Thick cord at lower back of eye

19. Diagram of the eye:Very dry…

20. Can you identify the structures now???

21. Facts!Eyes….. -Are the most complex organs in the body second to the brain. -Contribute to 80% of your total knowledge -Are composed of more than 2 million working parts -During a normal life will bring in 24 million images of the world around you -The adult eye measures about one inch in diameter (2.5 cm), but only one sixth of the area is exposed on the front.