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So what does it mean if you can see part of the number?
For question 2, there first time I watched I saw 71 instead of 74. On second viewing I could make out the rest of the 4 but it is faint. On question 5, I saw a 3 instead of a 2, but on second viewing I could see there why it was a 2.
Essentially it's a degree of that type of color blindness. I had some where I could see slight differences where there probably was a number but I could be 100% sure what number it was.
On those, I showed my wife the same number and she immediately called out the number without hesitation.
So it shows that you have some degree of colorblindness for whatever colors that particular test is testing you for, just not complete color blindness.
Way back in the 80's I got a pair of those blu-blocker sunglasses (yeah, I was totally rad). I remember playing the original Wasteland on my Commodore 64. In this game, when you were in a city, there was a top-down view of buildings. Blue buildings were active and you could go into them. Purple buildings were essentially just an image and you couldn't interact with them.
I could never tell the difference between the two buildings so I would just have to do trial-and-error to see if I could go into. I put the blu-blockers one day and then I could differentiate between the two buildings. It didn't let me see the purple and blue as true colors, but it let me see a difference I could then use to know which ones I could interact with.
In addition when i drove with the blu-blocker sunglass... all the blue colored signs would appear green (like a Hospital sign) and all the green colored signs would appear blue.