vision part 2 module 3: designing for communication lesson ext 3

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Vision Part 2 Vision Part 2 Module 3: Designing for Communication LESSON Ext 3 LESSON Ext 3

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Page 1: Vision Part 2 Module 3: Designing for Communication LESSON Ext 3

Vision Part 2Vision Part 2

Module 3: Designing for Communication

LESSON Ext 3LESSON Ext 3LESSON Ext 3LESSON Ext 3

Page 2: Vision Part 2 Module 3: Designing for Communication LESSON Ext 3

Module 3: Designing for Communication

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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

Page 3: Vision Part 2 Module 3: Designing for Communication LESSON Ext 3

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.

Page 5: Vision Part 2 Module 3: Designing for Communication LESSON Ext 3

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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Refraction Water glass demo

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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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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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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?