Disturbances of visuon as the first symptom of insufficient circulations of the brain caused by pathological changes in carotid arteries. Investigations by means of Transcranial Doppler TC2-64-B. Preliminary report - Staszkiewicz, Jolanta; Hilgertner, Lech; Czechowicz-Janicka, Krystyna; Szostek, Mieczysław; Staszkiewicz, Walerian (Klinika Oczna / Acta Ophthalmologica Polonica, 1990)