I have only had one eye for many years and was a flight attendant before it happened now have received a one on one interview with airline. I just wonder if my eye will be a problem.
Let me refer you to the answer of this other question, that says a pilot may be considered for any class of medical (including First Class) with only one functional eye.
I think its fair to conclude that if a pilot can get a First Class medical with one functional eye, then you can be a flight attendant with one functional eye, assuming that you can fulfill all of the duties required.
I couldn't find any clear details on what the certificate requires, but it looks like each operator (airline) creates their own certification program and the FAA approves it. Based on the name, I assume that it's all about whether or not you can do the job rather than any specific medical requirements.