Shevassyuk. Chevage's symptom, ventriculocavernous symptom, is an acute incoordination of eye movements when looking at a close object (for example, a hand).
The prevalence of IDA in the population is, according to various authors, on average 7% in women and 2% in men (R.A. Draluk, A.N. Pokrovsky, M.Yu. Kaprin, E.S. Vorobyova, 2014).