We are going to view the following color

blindness YouTube video. Keep in mind, I did not create this, nor am I doctor – this is NOT a

diagnosis! Also, if you do not want to participate in the color blindness activity, you do not have to. However, you are responsible

for all other questions on this POGIL. http://www.youtube.com/watch?v=CWyrp3hu4KE

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The first few slides are retrieved from webmd.com

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What is color blindness?

• Color blindness means that you have trouble seeing red, green, or blue or a mix of these colors. It’s rare that a person sees no color at all. Color blindness is also called a color vision problem.

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What causes color blindness?

• Most color vision problems are inherited (genetic) and are present at birth. People usually have three types of cone cells in the eye. Each type senses either red, green, or blue light.

• You see color when your cone cells sense different amounts of these three basic colors.

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What causes color blindness?

• Inherited color blindness happens when you don't have one of these types of cone cells or they don't work right. You may not see one of these three basic colors, or you may see a different shade of that color or a different color. This type of color vision problem doesn't change over time.

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Color Vision Fundamentals

Jeff Rabin, OD, PhDChief, Visual Function Laboratory

Ophthalmology BranchUSAF School of Aerospace Medicine

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Visible light is small part of electromagnetic spectrum.

700 600 500 400

UVIR

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The visible spectrum includes 300 wavelengths (400-700 nm), and in some portions we can discern color differences of 1 wavelength. The ability to see so many colors depends on:

a. a separate cone for each wavelength.b. optic nerve fibers for each color.c. visual cortex neurons sensitive to each color.d. difference in stimulation of red, green and blue sensitive cones.

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Why do colors that look different to us appear the same to

color deficient individuals?

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Color normal              Color Deficient Dichromat

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Some Views With and Without Color Vision

Link Jay and Maureen Neitz Color Vision Page

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http://www.webexhibits.org/causesofcolor/2B.html#vissamp

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Color Deficiency Males Females

Protanopia 1% 0.01%

Deuteranopia 1% 0.01%

Protanomaly 1% 0.01%

Deuteranomaly 5% 0.4%

Overall (red-green)

8% 0.5%

Tritanopia 0.008%

0.008%

Tritanomaly Rare Rare

Rod monochromatis

m

Rare Rare

Cone monochromatis

m

Rare Rare

On a sheet of loose-leaf

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Demo Name

What did you SEE happening (words/picture)

Do Now – why do you THINK it was happening

Exit – what ACTUALLY happened?

Prism

Bent Pencil

Quarter

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Today’s Goals:1.Discuss #9-15 from HW with peers or teacher. (you can check answers in teacher’s text)2.Finish Ch 28 POGIL part 33.Complete EXIT portion of Do Now and turn in

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MIXING COLORED FILTERS

Different filters absorb certain types of light and let others through. All the overlapped pigments absorbed the visible lightIt’s black because it’s blocked by pigment

COLOR WHEEL

RGB light makes white light and the it makes the white show Colors move faster than your eyes can see and create white light It’s going so fast and all the frequencies are overlapping to form light (mixing by ADDITION!) MIXING COLORED LIGHT

Different types of light create new shades when added together. All the colors together creates white light. RGB mixed makes white lightAddition – not subtraction – in color that made white light (not black/brown)Light is different than pigment The frequencies are added The frequencies overlap and add together to make new colors