Color Blindness: Protanopia

Color Blindness: Protanopia


In the human retina, there exist both rods and three types of cones. The rods are chiefly the receptors that respond to light levels, while the cones send colour to the brain for interpretation.

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An absence or slow development of these colour receptors is what is termed 'colour blindness.' Colour blindness can also be acquired through damage to the retina, optic nerve, or specific areas of the brain, though when acquired, it can actually manifest as a colour blind "spot" on the eye, having complete colour vision outside of that spot.

To say that colour blindness is an absence of colour is not so true for humans. In fact, total colour blindness, seeing life as a black-and-white television show, is extremely rare. Even rarer so is it that colour blindness occurs in females. What it really should be commonly known as is colour deficiency.

The most common in colour deficiency is a hereditary red-green type, which is actually a generalisation. What it aims to scratch at are two specific classifications. One such term is Protanopia, and that means a difficulty in distinguishing differences between red, yellow, and green, as they can often appear all to be yellow or brown.

For example, the first picture is that of rainbow stripes.
Rainbow Stripes (normal colour sight)

And this is the same picture as if see with the condition Protanopia.

Protanope sight


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8 Comments
Showing 1 - 8 of 8 Comments

klip

Did you know that the military often use colour blind people to spot camouflaged objects and people? The camouflage colours that fool the rest of us seem so obviously different to them - maybe colour blind people are more aware of differences in tonality? I'm not sure why this is. I have quite a few friends who are artists, who are colour blind. I always wonder what to think of their work, as I'm obviously at a disadvantage when looking at it. And why is it that colour blindness seems to be so much more common in boys? I dont think I've ever met a woman who is colour blind.

keb

I am color deficient. cpultz is absolutely right about how a person discovers that they are afflicted with this disorder. It wasn't until a test from my eye doctor at the end of junior high or beginning of high school that we finally understood what was going on. All the years of being chided by my teachers of picking a purple crayon instead of a blue now made sense.

I'm a graphic artist, and need to know my color theory better than normal artist because I need to know what compliments through theory rather than just actual sight. Thank goodness for the computer age where I can look at colors in their RGB or CMYK formulas, and determine what colors I am using.

Also, a fact that I find interesting is that sunlight really helps when I need to determine color. I thought I had a red vacuum for a whole year before one sunny day I was vacuuming the car and suddenly realized my vacuum was green. Sometimes it really stinks to be color blind, but I compensate through knowledge of color theory, relying on sites like this, my skills in values and contrast, and my wife who helps me line up my pastels into color groups so when I am looking for a flesh tone I don't use a green.

klip

Is it correct to refer to colour blindness as a deficiency? Dont you just see colour differently from me? That is something I have not understood. I mean - I can understand that it is necessary for you to compensate for your vision when designing something which is going to be seen by a majority of "colour normal" people, as you wish it to look a certain way to them. But surely there is no such thing as the "true" colour of something? I mean - isnt your vacuum cleaner the colour you perceive it to be? And it is a different colour to a bee, who can see the ultra violet spectrum, and a different colour in the evening, or when a coloured light is shining on it, etc?

ruecian

It's termed 'deficiency' because the difference in perception is characterised by a smaller range of perceived colour. It's not blindness because it's not a complete absence of colour, as those cases are very rare.

jaimebienlesfruits

Is colour blindness a web accessibility issue? Certainly, not enough people pay attention to web accessibility, even less about colour blindness.

ruecian

In terms of web accessibility, I'm sure some colour schemes are nearly impossible to read without highlighting text. And even then. I'm sure somethings can even remain hidden.

xxxnataliemartinxxx

im 13 and last year i found out i was total colour blind .
If your colour blind it dosnt mean every thing is gray cause that seems to be what most people think ? It just that you see colours as other colours for example red as orange or purple as blue .. so i can figure out wat colour i am using cause if its blue to me then its purple to every one else .. i was wondering if your colour blind can you join the army cause i have been told you cant but i hope you can :( please some write back :(

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