Till what limits is it completely fard on a son/daughter to obey his/her parents?

Salam everyone, This is a question that has been on my mind for quite a long time. I will present an example so that it makes more logical sense. I know that it is not permissible to disobey my parents unless they command me to do something that's against Islamic teachings. But what about teachings that don't affect Islam, but they do affect me. Like let's say I want to choose an IT field as my profession but my father, due to lack of knowledge, can't accept the fact that IT fields have a scope and orders me to go for medicine. Now I try to explain this, but he won't accept and is stubborn without any logic. This is something that I will have to go through all my life, I'll have to study a field that wasn't my choice, work in it even though I never wanted to. While I will be going through all of this, my father will not be affected in any way. Since this is a case that doesn't affect religion or causes me to go through something haram it is still something that causes me distress and on the other hand the one who had the right to chose this path for me now, plays no part in it. Does Islam really want me to obey my father in this case? Doesn't it give him authority over a thing he doesn't have enough information to make a sane and logical decision?