vision part 2 module 3: designing for communication lesson ext 3
TRANSCRIPT
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Vision Part 2Vision Part 2
Module 3: Designing for Communication
LESSON Ext 3LESSON Ext 3LESSON Ext 3LESSON Ext 3
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Module 3: Designing for Communication
LESSON Ext 3LESSON Ext 3LESSON Ext 3LESSON Ext 3
Lesson OverviewHow does the human body process communication?
In this lesson, you will learn: What happens to light as it enters the eyes What problems can arise with color vision
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Module 3: Designing for Communication
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Guiding Questions What makes a certain wavelength bounce off an object? What makes grass green? What makes blood red?
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Module 3: Designing for Communication
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Pigment Pigment is the material that changes the light through selective absorption to give
an object its color.
Photopigments in the eye help the cones to process the light.
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Module 3: Designing for Communication
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Focus Light traveling through the eye is
Bent
Refracted
Focused
Define Refraction
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Module 3: Designing for Communication
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Refraction Water glass demo
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Module 3: Designing for Communication
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Focused? Fluid in the eye is like the water in the glass
Bending, refracting, and focusing flip the image upside down
Optic nerve creates electrical impulses that are transmitted to the brain
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Module 3: Designing for Communication
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Optional Activity Activity with concave and convex lenses
Magnifying glass activity
Simulated Optics Experiment
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Vision Problems Short-sightedness (myopia)
Long-sightedness (hypermetropia)
Astigmatism
Presbyopia
Color sensitivity
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Color Deficiency Also known as color-blindness
Unable to detect a certain color or a set of colors
Inherited
Caused by a gene with the wrong code
Light is shifted causing another color to be seen
More common in males
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Classifications of Color-blindness Trichromacy
Dichromacy
Protanopia
Deutanopia
Tritanopia
Monochromacy
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What is it like to be color-blind? Take a color-blindness test:
http://colorvisiontesting.com/ishihara.htm
http://colorvisiontesting.com/online%20test.htm What color deficient people see:
http://colorvisiontesting.com/what%20colorblind%20people%20see.htm
Web design and color deficiency:
http://www.iamcal.com/toys/colors
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Module 3: Designing for Communication
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Assignment Use this Web site to choose colors that you think would be best
suited for the background of a Web site and a text color. Write a short justification of your choices. Web design and color deficiency:
http://www.iamcal.com/toys/colors
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Module 3: Designing for Communication
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Lesson Review
How does the human body process communication?
What happens to light as it enters the eyes?
What problems can arise with color vision?