Uh. AN eye doctor with no testing for color blindness? Really? They need to change eye doctors.
Not an eye doctor, just the generic doctor. But the generic doctor didn't see any need to forward to an eye doctor.
Not judging what they do or do not from afar without context, but anyone concerned with a vision problem should go see an eye doctor, if just to make sure. A generic doctor can do almost nothing serious about your eyes, except maybe treat a minor infection, and even so, an examination with proper equipment is often prefered to rule out any other more serious problem.
I'm a bit surprised, things are probably different depending on countries and habits, but over here, eye exams are done routinely on children, and are recommended once a year or couple years when adult. And any eye exam I got included not just acuity but also color blindness tests. So that's definitely something that shouldn't go unknown for a long time. Just my 2 cents, I don't know the context, so just saying in general.