Blog Post

color contrast screening test for visual dyslexia

i now have 12 people with "known dyslexia" and 4 people with "probable dyslexia" that have tested "positive for dyslexia" with my screening test, and 18 people with known "non-dyslexia" that have tested "negative for dyslexia" with my screening test.  

The known dyslexics I have tested can all see the Blue-on-Black rotating image better than they can see the Green-on-White rotation.  Non-dyslexics have the opposite pattern of being able to see the Green-on-White images better.  

(If you start at a viewing distance of 5 feet you can see the rotating Black/White-on-Gray image and the Blue-on-White, Red-on-White, Red-on-Black, and Green-on-Black rotatiing images at 5 feet.  Viewing the three rows of rotating images at 5 feet, dyslexics should see the 7 foot threshold Blue-on-Black image and the 10 foot threshold Green-on-White image.  Non-dyslexics should see the 7 foot threshold Green-on-White image and the 10 foot threshold Blue-on-Black image.) 

See http://www.dyop.org/color.htm for an explantion and http://www.dyop.org/documents/ColorContrast=2011-11-02.swf for the actual test which takes about 15 seconds to use.

Hopefully, Cathy Davidson will see this and will send her observations to Allan@dyop.org

 

 

 

 

 

 

 

 

 

 

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