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August 1980

Effects of Six Conditions of Ocular Fixation on Caloric Nystagmus

Author Affiliations

From the Departments of Otolaryngology (Drs Karlsen and Goetzinger) and Biometry (Ms Hassanein), University of Kansas Medical Center, Kansas City.

Arch Otolaryngol. 1980;106(8):474-476. doi:10.1001/archotol.1980.00790320026007

• Caloric tests were performed on 20 normal volunteers under the following six conditions of ocular fixation: (1) eyes open with lighted +20-diopter lenses; (2) eyes open with lighted +20-diopter lenses plus strobe lighting; (3) eyes open in darkness; (4) eyes closed in darkness; (5) eyes closed in a dimly lighted room; and (6) eyes open with unlighted +20-diopter lenses plus strobe lighting. Latency, amplitude, frequency, duration, and speed of the slow component were measured from a permanent recording. Significant differences were found between the lighted +20-diopter lens conditions and all others for all variables except latency. Tests performed with lighted +20-diopter lenses should be cautiously interpreted due to the noticeable response suppression noted in these conditions. The present procedure of performing caloric tests with the eyes closed in a dimly lighted room was found to be unquestionably preferable.

(Arch Otolaryngol 106:474-476, 1980)

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