I was told as a child that grass was green so how do you know, for example, that the colour I see as green is the same colour that other people see?

mk2norwich

Yes, I too have heard the theory that color/colour perception varies in some people. Is your blue sky as blue as mine...? May 22 02, 6:35 PM

Blind as a Bat

It's called color blind, and more men have it than women. May 22 02, 6:46 PM

Jojo	Blind as a Bat - I disagree. Colour blindness is a recognised condition and there are tests that can be done to see if you suffer from the condition. May 22 02, 6:54 PM

Norwich

Jojo is right - Colour blindness is something quite different - See: http://www.delamare.unr.edu/cb/ for information about this condition. May 22 02, 7:04 PM

eliasen

One testable starting place would be to see if the pigments in your retina's cone cells (the ones sensitive to color) absorb the same wavelengths as someone else. There are three different pigments that tend to absorb blue, red, and green light. If the pigments in two peoples' eyes are roughly the same, that's a good start to indicate that they'd tend to be similarly sensitive to different wavelengths in the same way. I think the fact that one person likes one color and another hates the same color shows that even if we receive the wavelengths the same, our heads are wired differently inside, and our associations and perceptions of colors may be horribly different. May 22 02, 7:11 PM

Friar Tuck

If it wasn't so the saying might be 'the grass is always pinker on the other side'. Your perception of colour is purely individual and will vary from person to person. You have been taught to accept that colour for what it is from birth. Someone elses perception could be the complete opposite but they too have learnt to accept it as the norm. May 22 02, 11:57 PM

cheatah

Blind as a Bat says more men have it (colour blindness) than women. I was led to believe that only men suffered this, and not women. Any truth in this? May 23 02, 12:07 AM

Sad

I'm color blind...it doesn't effect me much other than sometimes people laugh at the clothes I wear (they say they clash), and I wasn't able to fufill my childhood dream of becoming an Airforce Pilot. Also, I often feel as if I'm missing out on being able to experience color like most of humanity. But it's really no big deal. Women can be colorblind--but its very rare. May 23 02, 12:54 AM

Jack Flash

I have had a problem in identifying certain colours throughout my life and whilst I have never failed a colour-blindness test I feel certain that my perception of colours differs from that of others in particular aspects. So it is quite possible that when looking at a particular object some of us may see it slightly differently. However the reason why far more men than women are colour blind is due to the fact that colour-blindness comes from a defect in the X-chromosome. Females have two of these whilst males have one X and one Y. One perfect X-chromosome is all that is needed to give you normal colour vision. So if on average one X-chromosome in 100 is defective, colour-blindness will be found in one per cent of men. But in women it will occur only when both X-chromosomes are defective, which works out at one case in 100 times 100. May 23 02, 11:47 AM

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