How are color blindness see the rainbow?

Filed under: People |

Color BlindnessMaybe you are thinking that all of color blind people see the world consisting of black and white only. But actually not, not all of the patients are suffered from total color blindness. In fact, the majority of them were suffer from partial color blindness. It means, they can still see colors, but not as complete as a normal person.

There are three types of partial color blindness: Deuteranopia, Protanopia and Tritanopia.  Again, they, who are suffered from one of this type, could see colors too.  However, for certain colors, they have difficulties in distinguishing them.  For example, Protanopia and Deuteranopia have difficulties to distinguish green from red colors, that’s why these types of color blindness are also called as red-green defficiency or red-green color blindness.  Whereas, Tritanopia has difficulties to distinguish colors in bluish color spectrum.

All of them are caused by the lackness of one of three cone cells.  Cone cells are responsible to absorb lights and activate color pigments.  In normal conditions, eye’s retina contains all of three cones.  They are S-cones, M-cones and L-cones, they are also reffered to Blue- Cones, Green-Cones and Red-Cones respectively.   To see colors completely, we need all of those cones presences to work together.  They process color information captured by retina and then this information will be sent to brain to be perceived.  The lackness of three types of cone cells, even only one cell, results incomplete color information for brain.   This condition of lackness often called as color blindness.

This article will not reveal about how and the cause of color blindness in detail.   Because it will need so many technically words and phrase.  We are talking about how color blindness perceive colors.  What is the difference between colorblind and normal color perception?  Why are they cannot pass the Ishihara test, which is the common test for color blindness.  We need a simulation to understand colorblindness color perception.

These are the simulation:

Simulation 1. Rainbow Colors

Color BlindWe can see that color blindness could see colors, could’nt they?  But the simulation reveals that color blind perception of colorblindness’ are differ to that of normal color vision.  We can see Deuteranop and Protanop color perceptions are almost similar to each other, their color spectrum is only consists of two colors: red and green.  Deuteranop and Protanop will perceive Yellow, Green and Red color to yellowish color, which are differ only in brightness.  Whereas, blue colors are not affected very much, they are still blue.

For Tritanop, who is lack of S-cone or Blue-Cones, confuse blue with green and yellow with violet.

Simulation 2, Color of Pencils

Color Blindness

Simulation 3, The Ishihara Test

What is the Ishihara test?

Ishihara Test

Ishihara test for color blindness

Ishihara Test is a common test for assessing color defficiency to human.  This test is ivented by Dr. Shinobu Ishihara, a professor at the University of Tokyo, this test is published in 1917.  This test will show people to a number of colored test.  Each plate contain a circle of colored dots.  The dots form a number or pattern which is visible to normal color vision and is difficult to see for the people who are suffered to color vision defect.

This simulation below shows one of Ishihara Plates.  Normal Color Vision will show a number of 6, so does the Tritanope.  If people is tested by this plate and do not recognize any number on it, it means there is likely the person is suffering from one of red-green colorblindness, Protanopia or Deuteranopia.

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8 Responses to How are color blindness see the rainbow?

  1. Thanks God, I have normal eyes. Every time I hear or read the news about color blindness, my heart will beat faster than usual. I think it’s really scary to have such a disease. Life may not be so colorful for those who suffer from it. We really should appreciate our very own eyes. Thanks for sharing.

    May 12, 2010 at 4:54 pm

  2. im a color blind Y_Y

    May 6, 2011 at 9:40 am

  3. Question: Normal colour-sensitive people see a light-brown ’6′ in the “Normal” and reddish ’6′ on the “Tritanope”

    June 27, 2011 at 2:47 pm

  4. This is to those who dont really understand the condition of color blindness..First and for most just because a person is “colorblind” does not mean that they cannot see any colors. It really just depends amd the severity of the condition. Some are not as colorblind as others the only difference between a “normal” eye is that you can see more shades than a colorblind individual can see. Colorblind people can still see color….It is simply a mutation that most women actually carry in their genes. However it is usually prodominate in males because their mother has past it down to them in their genes. In some cases but not as comon, a female can also has a colorblind deficiency. Unfortunaly, in these cases the female may have an extra mutation that actually allows it to show through. AS MENTIONED BEFORE, the colorblind can see color, we do not live a life without color! We see the beautiful colors that the world has to offer. Just not the indistinguishable colors that are easily seen by others! Myself and my son are both colorblind and we see just fine with the colors that are available for us to enjoy. Personnally I feel that its burdensome just kinda funny.God has created each of us in our own special way and we are just as privlaged as those who have a “normal” eye….

    Julie Cruz
    June 12, 2012 at 12:16 am

  5. I meant to say that it is NOT BURDENSOME, JUST KINDA FUNNY… LOL

    Julie Cruz
    June 12, 2012 at 12:19 am

  6. Hi Julie,

    Your opinion is very good. you know a lot about this, so I ask myself, whether you’re a color blindness? or are you an expert who studied about the color blindness? hahahahhah… Btw Thanks for your comment. :)

    June 12, 2012 at 2:24 am

  7. For “normal” the 6 appears to be red and for the 6 in “tritanope” I see pink. Is that right? I can’t see anything in the other two.

    July 3, 2014 at 7:00 am

  8. Can a partially colour blind man have a chance to become a fighter pilot in air force??

    Abdul ahad
    August 3, 2014 at 9:37 am

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