Color blindness?

I suspect I am slightly color blind due to my difficulty in reading the color dot things. Although this has had no impact on my life at all up to this point, it is my understanding that this fact my have some significance to the navy. I am trying to get into the Nuke program so im not so sure how important it is or what actions I can take if I fail the initial test for MEPS. Does anyone have advice or knowledge they could lend me?