The term microscopic aura comes from the Greek words mikros (small), skopeo (I am looking at), and aura (breeze, smell). It refers to a type of *aura or 'warning symptom', occurring in the context of paroxysmal neurological disorders such as epilepsy and migraine, in which objects and stimuli in the environment are perceived as disproportionally small. The introduction of the French term aura microscopique has been attributed to the Swiss neurologist Otto Veraguth (1870-1944). The term is used in opposition to the term * macroscopic aura.
References
Critchley, M. (1949). Metamorphopsia of central origin. Transactions of the Ophthalmologic Society of the UK, 69, 111-121.
Dictionary of Hallucinations. J.D. Blom. 2010.