Honest question: does "sensory perception disorder" come out of evidence-based science? Is it diagnosed just based on symptoms, or can they actually tell someth

Honest question: does "sensory perception disorder" come out of evidence-based science? Is it diagnosed just based on symptoms, or can they actually tell something's going on with the brain specifically? I ask because isn't it possible that this could be a sort of "vanity disorder"? Not saying it's good to have it, but people might be tempted to think they do.