I wonder how do people with PMO actually know they have this condition? If they always see faces "distorted", how do they know other people see them differently

I wonder how do people with PMO actually know they have this condition? If they always see faces "distorted", how do they know other people see them differently? Maybe when they feel the inconsistency when touching their face? Or they do not see distortions when they see only parts of a face and the rest is hidden?