Color Blindness “Color Vision Deficiency”. What is it? Our eyes determine Color the wavelength of a light seen Photoreceptors send Chemical messages to.

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Presentation transcript:

Color Blindness “Color Vision Deficiency”

What is it? Our eyes determine Color the wavelength of a light seen Photoreceptors send Chemical messages to brain Most of us have 3 types of Cones in the Eye – Red, Green and Blue – Called “Trichromatic”

Types of Color Blindness Anomalous trichromacy – Have all 3 cones – One is defective – Least severe Dichromatic vision – Missing one cone Monochromacy – All cones are defective – See only black, white and gray How ColorBlindness Works How ColorBlindness Works

How does a person become colorblind? Most are inherited at birth – X – Linked Recessive Aging Injury to the eye Side effect of Medicines Eye Disorders – Glaucoma, macular degeneration, cataracts, diabetic retinapothy

Are dogs Colorblind? Dogs are Red/Green color deficient They only have 2 cones in their retina – Blue and yellow Can still perceive a red ball from a green one if there is enough brightness

Testing for colorblindness Ishihara Test – Colored plates – Diagnose red/green colorblindess – Not the most accurate Anomaloscope – Match colors on a screen by adjusting the light – Most accurate – Test online Test online

Color Blindness Testing Cont’d Farnsworth Munsell 100 Hue Test – Arranging colored chips by order of hue – Online Test Online Test

How a Color Deficient Person sees the World g.com/what%20colorbli nd%20people%20see.ht m g.com/what%20colorbli nd%20people%20see.ht m

YOU WILL TAKE THE ISHIHARA TEST THE FIRST 3 SLIDES ARE DEMOS TO SHOW YOU WHAT TO EXPECT

Answer: Everyone should be able to see a circle, star, and square in the demonstration plate.

Colorblind individuals should see the yellow square. Color normal individuals should see the yellow square and a "faint" brown circle.

Colorblind individuals should see nothing. Color normal individuals should see a "faint" brown boat.

Continue Ishihara test online blindness.com/colour-blindness- tests/ishihara-colour-test-plates/

ISHIHARA TEST YOU CAN DO AT HOME test/#prettyPhoto

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