I'm blind in one eye (since birth) so I don't see in true 3D. I thought it was because of this--and my long term memory issues--that I have a hell of a time remembering peoples faces (or names). I am not the guy prosecutors want as a, "he saw the perp's face" witness to a crime... I don't have prosopagnosia (true face blindness) but a whole heck of a lot of people look the same enough to me that I have difficulty telling them apart without hearing their voices (I'm fantastic with voice ID; probably comes naturally when you have trouble with faces haha). Yet I've met people who were also born blind in one eye that are absolutely fantastic at remembering people's faces (and names, obviously).
So what I'm getting at is that even though I don't have prosopagnosia I have difficulty with faces. There's got to be a spectrum as with most cognitive measurements. Psychiatrists don't have yes/no charts when they test you for things; It's pretty much all scales from 0-10 (or 200-799 for some reason haha).
Just curious (if you read this far): How hard (for you) is a question like this? https://www.123test.com/content/question5.jpeg