I think that the approach was definitely a little insensitive, but asking you what happened isn't outside the range of normalcy for someone who is trying to diagnose you.

Having a diagnosis helps you treatment wise.

To me, without information, it'd be like going to your family doctor and saying, I have a headache, please give me meds. Well, how did you get that headache? Were you just in a car accident? Have you changed jobs and now work long hours at a computer? When is the last time you had your eyes checked?

Does that make more sense?