Is colorblindness covered by EEOC or the Disability Act?

I am partially color blind and have been told I cannot become a police officer, even though I know of officers who have the same condition. I am otherwise healthy, have a bachelor's degree and have no criminal background. I passed written tests, a physical fitness test and even put through after my background interview with an investigator. Am I covered by the Disabilities Act (whether color blindness is or is not one) or EEOC from being discriminated against for the position of police officer? Thanks for your help.