Posted by: juliegriffey | June 9, 2014

What’s the difference between red / green color blindness and total color blindness and why is testing so important?

Color blindness testThis week at Amcon, we have the 14 Plate Ishihara Test Chart Book for Color Blindness on sale – a product that we have carried for years that is designed to detect both red/green color blindness and total color blindness. What the heck is the difference between red/green color blindness and plain old color blindness? And once you detect it – what is there to do about it? Why even bother?

The difference between red/green color blindness and total color blindness is actually pretty simple.  Total color blindness means that the person afflicted does not see color at all, only shades of grey.   The technical term for total color blindness is monochromasy and refers to a “complete absence of any color sensation.”  This type of color blindness is actually pretty rare.

Red/green color blindness is much more common – afflicting approximately five in every one hundred males.  When you are red/green color blind you make errors in the distinguishing between red, orange, yellow and greens.  The degree to which the person afflicted struggles with distinguishing these color differences vary tremendously.

Color blindness is much more common in men than women because many of the genes involved in color vision are on the X chromosome.  Because men have just one X chromosome and women have two – males are more likely to be color blind.

There is obviously no cure for color blindness, so those afflicted develop their own coping mechanisms.  In fact, there are many resources available that address how to better live with this affliction.    But it’s very important to know if a person (especially a child who might not be able to articulate the issue)  is color blind because the mistakes a person might make due to color blindness might be interpreted as a learning deficiency or some other type of disorder.

 

Reference:
http://colorvisiontesting.com/color2.htm
http://wearecolorblind.com

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