I am a color blind person, usually I cannot distinguish the color of red and green, so every time there is a color blind test, it will be a hard time for me.
Every time during the color blind test, when everyone is doing a easy job, just read the number in front of them at loud, I was always stare at these strange picture and can't find anything on them. Only people who have these kind of experience knowing how embarrassing is that.
But one time, I found a very interesting thing, because the test room for color blind allow two people step in at the same time and using the same test picture, so I have the chance hearing what the person beside me said and just repeat that number to the nurse, and what is more interesting is that, after I knowing what is the number on the picture (I heard for that guy beside me), I actually can "see" that number in that colorful picture, and it's very clear. I think it may because after my brain receives the message from listening, it can affect the result which is send by my eyes.