IT IS NECESSARY that the patient with Meniere's syndrome receiving ultrasound treatment be kept under observation during the entire procedure, since the nystagmus pattern determines the length of irradiation. The observing can be done by an assisting physician—the most common procedure up to now. Nystagmus can also be registered with the help of electronystagmography, which method has made possible a detailed analysis of the nystagmus pattern during the entire procedure (Sjöberg et al, 19631).
In order to simplify these observations we have constructed a mirror which can be fastened in front on the patient's face (Figure), thereby making it possible for the operator to observe the patient's eyes and nystagmus and at the same time check the facial function. Magnifying glasses according to Frenzel facilitate the observations and also prevent the patient from seeing the procedure, which is uncomfortable for many to watch.
The mirror is a plane-surface rectangle
JOHNSON S, STAHLE J. Mirror for Observation of Nystagmus During Operation. Arch Otolaryngol. 1966;84(4):479. doi:10.1001/archotol.1966.00760030481023