A narrow irido-corneal angle is a common variant. When the iris is dilated it bunches up at the narrow angle and can impede the outflow of fluid at the angle, thereby increasing intra-ocular pressure. Because it is a normal variant, it is unsurprising that an eye doctor who sees the variant every work day might not mention it. That second eye doctor mentioned it just as a matter of style, not an indication of some extraordinary mis-diagnosis on the first doctor's part.
In training we are taught "informed consent," to vomit forth every possible ramification of everything we do, the "lawyer's list." Early in my career I did exactly that and would provide patients with a lengthy discourse on all the possible side effects of every medicine I prescribed ("When you take this baby aspirin, you might die from anaphylaxis"). It was overwhelming how many patients would report "side effects" the very next day: "tired," "headache," "nausea," "dizzy." etc.
As an experiment, I started to provide only the serious potential problems. Lo and behold, the number of patients experiencing "side effects" dropped to near zero. I concluded that the lengthy discourses on side effects had a tremendous power of suggestion that was doing more harm than good. It's a judgment call.
I'm guessing that the first eye doctor read (correctly?) that you are a "worry wart," so he decided that he didn't want to worry you with a lengthy discourse on a normal anatomic variant. When the second doctor mentioned this normal variant, the outcome was exactly as the first doctor likely predicted—you worried yourself into a tizzy to the point of doubting the good care you received.
In my experience it is so rare for patients to miss reporting serious side effects that the incidence of such missed reporting is near zero. Should we unnecessarily worry 999,999 patients because 1-in-a-million might not report, for example, eye pain in the dark??? In the case of acute narrow angle glaucoma, eye pain in the dark (= dilated pupil) highly motivates patients to bring attention to the problem in plenty of time for the doctor to fix the problem (laser trabeculotomy = laser zap a couple of tiny holes in the iris to aid drainage). Period end of story.
If you experience eye pain in the dark (ooops… there's that power of suggestion at work) get your eye pressures checked. Otherwise… fuhgeddaboudit.