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For this assignment I made a powerpoint explaining the human eye and how it works.
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BY: E M I LY H U N D T
THE HUMAN EYE
DIAGRAM OF THE HUMAN EYE
http://63.240.118.132/images/Senior%20Site/Section%201/eye-diagram.jpg
EYE PARTS
Iris• Round, colored part of
the eye ball• Helps control the
amount of light that enters the eye
Lens• Clear structure in the
eye• Focuses light rays to
the retina
http://www.medterms.com/script/main/art.asp?articlekey=4044
EYE PARTS
Pupil• Dark hole of the eye• Controls how much
light goes in the eye
Retina• Nerve layer• Lines back of eye• Creates urges that
travel through the optic nerve to the brain
http://www.medterms.com/script/main/art.asp?articlekey=4044
EYE PARTS
Cornea• Clear outer layer of
the eye• Focuses light in the
eye
Optic Nerve• The nerve that
connects the eye to the brain• Carries impulses
formed by the retina to the visual cortex of the brain
http://www.medterms.com/script/main/art.asp?articlekey=4044
WHAT IS NEEDED TO SEE?
• If you guessed light, you are correct.
• The human eye can not see without some sort of light source.
ARE ALL PARTS OF THE EYE IMPORTANT FOR SEEING?
• The answer: Yes. Each part of the eye plays a different role, and each are equally important.• For example: The optic nerve connects to the
brain so you can remember things you see.• The lens focuses the light rays to the retina. • The pupil controls the amount of light that enters
the eye. • All are very important for seeing clearly.
WHAT DOES IT MEAN TO BE BLIND?
• People who are blind can not see.• Some blind people can see only shapes, bright lights, and dull lights. •One is considered blind if their vision is no better than 20/200.
WHAT DOES IT MEANTO BE BLIND
CONTINUED
• Some are born blind• Some become blind• Causes of blindness is if the optic nerve is
not functioning or is damaged.• When the cornea or the lens gets clouded
over, it does not let light in. This also causes blindness.
RODS AND CONES
• Both are parts of the retina• Rods work in dim light
• Cones are used in bright light• Both are used for seeing colors
CONES
• Cones are sensitive to color• They are less sensitive to light• The cones are accountable for high resolution vision.
RODS
•Not sensitive to color• Responsible for dark-adapted vision• Rods are good motion sensor.
WHAT IS 20/20 VISION?
• “Normal vision”• Can see at twenty feet what most people
can see at twenty feet• Does not mean perfect vision, it only
means the clarity of vision at a specific distance.
WORK CITEDPICTURES
• Slide 3-Lens picture-
• Slide 3-Iris picture-
• Slide 4-Pupil picture-
• Slide 4-Retina picture-
• Slide 5-Cornea picture-
• Slide 5-Optic Nerve picture-
http://excelens.in/images/newsletter/newsletter_clip_image003.jpg
http://fc02.deviantart.net/fs27/f/2008/042/0/0/Iris_Eye_Macro_Stock_by_zpyder.jpg
http://www.atlanta2020.com/wp-content/uploads/2011/08/DilatedPupil.jpg
http://www.topnews.in/healthcare/sites/default/files/retina.jpg
http://www.rustoneyeinstitute.com/images_content/cornea.jpg
http://www.daviddarling.info/images/optic_nerve.jpg
WORK CITEDINFORMATION
1. Adler, Irving, and Ruth Adler. Your Eyes. New York: The John Day Company, 1962. Print.
2. "Definition of Iris." MedicineNet.com. MedicineNet, 2011. Web. 10 Oct 2011. <http://www.medterms.com/script/main/art.asp?articlekey=4044>.
3. "Visual Acuity: What is 20/20 Vision?." American Optometric Association . American Optometric Association, 2011. Web. 10 Oct 2011. <http://www.aoa.org/x4695.xml>.
4. http://hyperphysics.phy-astr.gsu.edu/hbase/vision/rodcone.html#c4
