1. N OW Y OU S EE I T, N OW Y OU D ON ' T ! By. Tyzhane Lamkin Period: 1 Science Fair 2008- 2009

2. Q UESTION : To determine if age affects the size of a person's blind spot size.

3. O BJECTIVES /G OALS The object of my project was to determine if age affects the size of a person's blind spot.

4. P ROBLEMS & V ARIABLES M.V: Male or Female & Age R.V: The length of a person’s blind spot C.V: Age of the different sex C.V: Ruler to measure the blind spot = Manipulated variable = Reponding variable = Control variable

5. M ATERIAL 1.Rulers 2.Index Card 3.Pencil [Utensils] 4.Timer 5.Log Book

6. P ROCEDURE 1. Set up material 2. Make log with person’s name and info 3. Start timer 4. Observe the time and length of person’s blind spot 5. Repeat steps 2-4 6. Clean up materials 7. Write down what you observe and persons statement

7. B ACKGROUND INFORMATION Peripheral vision, or side vision, is the part of your vision that detects objects outside the direct line of vision. When you look at something, you use central vision to focus on the details, and peripheral vision to gather information about the surroundings. For example, your peripheral vision tells you where to look if someone enters the room, or if a car is approaching from the side. And as you read these words, you are using central vision to focus on a word or a few words, and peripheral vision to see where the words are within the sentence, the paragraph, and the page. The light-sensitive lining at the back of your eye, called your retina, has light-receiving cells, called cones and rods. Only the cones are sensitive to color. Cone cells are most abundant in the central region of the retina, called the fovea. This region gives you the sharpest view of an object. Rod cells are better at sensing objects in dim light than cone cells are, but they are not sensitive to color. Rod cells are also very sensitive to motion, and are responsible for your ability to detect things moving toward you before you can focus on them. This characteristic probably had strong adaptive value during the early stages of human evolution. In this human biology science fair project, you will investigate the range of your peripheral vision, and determine how this range is affected by color, shape, ambient (meaning surrounding ) light, and motion.

8. In my project my hypothesis was correct. Hint: Look at the picture and see if you notice anything

9. H YPOTHESIS As I determine the size of a person’s blind spot. By using a ruler and an index card I will identify a persons length of their blind spot and determine that age do effect your blind spot.

11. NameAge:Length: NameAge:Length: