I set out to earn my PPL in 2009. It got put on the back burner due to LIFE. I'm now 62. When I tested for my last medical card I failed those Ishihara color plates. I get about 3 or 4 and that's it. I can point out colors all day or night without any trouble. I can also distinguish all classes of airspace on a sectional day or night. I've also been a truck driver since the 80's and have never been diagnosed as color blind. Are these plates really an accurate assessment and is this going to cause me a problem?