The dots kind of test always drives me nuts....seems I have a Red-Green deficency....nothing said until I did my UK Medical exam....had the special light test they use...passed no problem....then 29 years after my first US Army Class One medical exam.....my friendly FAA quack decided I was "colour blind" and was going to ground me medically. Despite my protests....he remained adamant that I "did not see the same colours as "normal" sighted people" and thus was unfit. Notwithstanding my 9,000 hours of flying at that time....accident and incident free mind you.....it took my employer suggesting they would remove all of their business to some other clinic before our Quack decided maybe he was being out of order. Not really, an appeal....but had the same effect. The FAA and CAA have special tests to assess the degree of colour blindness.....hang in there and keep looking for a friendly quack that will try to help you.