Questions regarding data collected
Did any student see all of the colors correctly under all of the conditions?
Which colors were difficult to see on the blue background? Which colors were difficult to see on the red background?
What difference did the lighting conditions make?
Questions for consideration
How do road sign designers use this type of information when designing signs?
Based on your data from this experiment, using these colors to work with how would your design a sign for the highway to be seen at night?
Do you think this kind of color analysis is used by advertising companies when deciding how to design advertisements to sell products?
How would the results change if different types of materials were used instead of paper? For example different fabrics, plastics, etc.
What other industries do you think need to consider color schemes when designing their products?
Activity #2: Measure your ability to seeYou or many people that you know wear glasses. Have you ever stopped to wonder why they wear glasses? Do they wear them all the time or only during certain activities? Do you know what "perfect vision" is? Do you know if you have 20/20 vision? What is 20/20 vision anyway?
No doubt you have already had your eyes tested several times throughout your lifetime. This is usually done in some schools on a yearly basis, and at regular medical check-ups throughout life. Optometrists have developed a standard test to evaluate your ability to see at a distance. A Snellen Chart is used. This is a chart with a series of letters in lines. The size of the letters decreases as you look down the chart. Next to the letters on the right side of the chart is a series of numbers: 200, 120, 80, 60, 50, 40, 30, and 20. In this laboratory we will test our eyesight to determine how good our distance vision is.
Snellen Eye Chart (try to borrow this from your school nurse) Notebook or paper to record your results Cardboard to cover one eye
1. Stand 20 feet from the chart (make sure there is good light in the room).
2. Cover your left eye
3. Try to read the letters in the bottom row with your right eye.
4. If you cannot read most of them (about 8 out of 10) then try the line above it.
5. Continue to move up the chart until you find a line in which you can read most of the letters.
6. Record the number at the right of the line that you can read for that eye.
7. Cover your right eye and repeat steps 3-6.
Interpreting the Results:
Since each eye is tested separately you may have a different result for each eye. They need not be the same. If you were able to read all (or most) of the letters in the last line, labeled 20, with each of your eyes then you have "normal" or 20/20 vision. That means you, like most people can see this line at a distance of 20 feet.
If the smallest letters that you can clearly see are in the fifth line then you have 20/50 vision. This means that you have to be 20 feet from the chart to see the letters that most people can see when they are standing 50 feet from the chart. If you can only see the top line clearly, then you have 20/200 vision. This means that you must be 20 feet from the chart to see what most people can see at 200 feet.
Note: This exercise is not meant to accurately measure students' vision, and is not a substitute for professional vision analysis.
Questions for consideration:
1. What is the result for each of your eyes? Are they the same? What do these numbers mean. (Write a paragraph in response to these questions)
2. If you wear glasses: Is the result different with and without your glasses? Why is this?
3. If the result for a person is different for each of their eyes what does this mean with regard to the design of their glasses?