The human eye pp1


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For this assignment I made a powerpoint explaining the human eye and how it works.

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The human eye pp1

  1. 1. By: Emily Hundt<br />The Human Eye<br />
  2. 2. Diagram of the human eye<br /><br />
  3. 3. Eye parts<br />Iris<br />Round, colored part of the eye ball<br />Helps control the amount of light that enters the eye<br />Lens<br />Clear structure in the eye<br />Focuses light rays to the retina <br /><br />
  4. 4. Eye Parts<br />Pupil<br />Dark hole of the eye<br />Controls how much light goes in the eye <br />Retina<br />Nerve layer<br />Lines back of eye<br />Creates urges that travel through the optic nerve to the brain <br /><br />
  5. 5. Eye parts<br />Cornea<br />Clear outer layer of the eye<br />Focuses light in the eye<br />Optic Nerve<br />The nerve that connects the eye to the brain<br />Carries impulses formed by the retina to the visual cortex of the brain<br /><br />
  6. 6. What is needed to see?<br />If you guessed light, you are correct.<br />The human eye can not see without some sort of light source.<br />
  7. 7. Are all parts of the eye important for seeing?<br />The answer: Yes. Each part of the eye plays a different role, and each are equally important.<br />For example: The optic nerve connects to the brain so you can remember things you see.<br />The lens focuses the light rays to the retina. <br />The pupil controls the amount of light that enters the eye. <br />All are very important for seeing clearly. <br />
  8. 8. What does it mean to be blind?<br />People who are blind can not see.<br />Some blind people can see only shapes, bright lights, and dull lights. <br />One is considered blind if their vision is no better than 20/200. <br />
  9. 9. What does it meanto be blindcontinued<br />Some are born blind<br />Some become blind<br />Causes of blindness is if the optic nerve is not functioning or is damaged.<br />When the cornea or the lens gets clouded over, it does not let light in. This also causes blindness. <br />
  10. 10. Rods and cones<br />Both are parts of the retina<br />Rods work in dim light<br />Cones are used in bright light<br />Both are used for seeing colors<br />
  11. 11. Cones<br />Cones are sensitive to color<br />They are less sensitive to light<br />The cones are accountable for high resolution vision. <br />
  12. 12. Rods<br />Not sensitive to color<br />Responsible for dark-adapted vision<br />Rods are good motion sensor. <br />
  13. 13. What is 20/20 vision?<br />“Normal vision”<br />Can see at twenty feet what most people can see at twenty feet<br />Does not mean perfect vision, it only means the clarity of vision at a specific distance. <br />
  14. 14. Work citedPictures<br />Slide 3-Lens picture-<br />Slide 3-Iris picture-<br />Slide 4-Pupil picture-<br />Slide 4-Retina picture-<br />Slide 5-Cornea picture-<br />Slide 5-Optic Nerve picture-<br /><br /><br /><br /><br /><br /><br />
  15. 15. Work CitedInformation<br />Adler, Irving, and Ruth Adler. Your Eyes. New York: <br />The John Day Company, 1962. Print.<br />2. "Definition of Iris." MedicineNet, <br /> 2011. Web. 10 Oct 2011. <br /> <<br />iclekey=4044>.<br />"Visual Acuity: What is 20/20 Vision?." American <br />Optometric Association . American Optometric <br /> Association, 2011. Web. 10 Oct 2011. <br /> <>.<br />4. http://hyperphysics.phy- <br /><br />