<unk>  is not part of any major classifications like the ICD-10 and the DSM-5. Since there is no established diagnostic criteria for<unk> , and because<unk>  is a disturbance of perception rather than a specific physiological condition, there is likely to be a large degree of variability in the diagnostic process and thus it can be poorly diagnosed. Often, the diagnosis can be presumed when other causes have been ruled out. Additionally,<unk>  can be presumed if the patient presents symptoms along with migraines and complains of onset during the day (although it can also occur at night). Ideally a definite diagnosis requires thorough physical examination, proper history taking of episodes and occurrences, and a concrete understanding of the signs and symptoms of<unk>  for differential diagnosis. A person experiencing<unk>  may be reluctant to describe their symptoms out of fear of being labeled with a psychiatric disorder, which can contribute to the difficulty in diagnosing<unk> . In addition, younger individuals may struggle to describe their unusual symptoms, and thus, one recommended approach is to encourage children to draw their visual illusions during episodes. Cases that are suspected should warrant tests and exams such as blood tests, ECG, brain MRI and other antibody tests for viral antibody detection. Differential diagnosis requires three levels of conceptualization. Symptoms need to be distinguished from other disorders that involve hallucinations and illusions. It is usually easy to rule out psychosis as those with<unk>  are typically aware that their hallucinations and distorted perceptions are not 'real'. Once these symptoms are distinguished and identified, the most likely cause needs to be established. Finally, the diagnosed condition needs to be evaluated to see if the condition is responsible for the symptoms that the individual is presenting. Given the wide variety of metamorphopsias and other distortions, it is not uncommon for<unk>  to be misdiagnosed or confused with other etiologies.
Alice in Wonderland syndrome
Sinding-Larsen and Johansson syndrome
Dahlberg Borer Newcomer syndrome
Koolen–De Vries syndrome
Cortes Lacassie syndrome
Morgagni Stewart Morel syndrome
Bohring–Opitz syndrome
Satchmo's syndrome