It certainly can be a disadvantage, however I am aware of a very successful ophthalmologist who is an outstanding surgeon who does not have good stereopsis. Certainly don't advertise that you don't have stereopsis if you have your heart set on a spot.
Although there are ophthalmologists without good stereopsis, the question that should be asked is: did they lose stereopsis before they started doing surgeries or after? It makes a big difference, I think.
i meant to ask, can you do surgeries in this specialty while relying on some other cues? like if you're looking for some vessel to cut can u keep moving your knife forward until it bumps into the vessel or thats a fail? would your career be over if u lost one of your eyes?