About daltonism ...

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I just thinked about something and this popped up . As long as i remember it was color blindness or color mixx up by the eyes . Ok about the blindness i get it you see two different colors and they are the same this can be found out . But about the mixing ... lets start from the begining if you live with it even if you see the red - black and the black - red ... you are teached that red (you see as black) is red and black(you see as red) is black . So how can we find out a person is actually having this desorder . Ok i thinked a little more there are types of colors you can say the black is dark color and explain it somehow but well if you mistake lets say yellow with orange then how can u actually find out you have this dissorder ?