• 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)
Karlsen EA, Goetzinger CP, Hassanein R. Effects of Six Conditions of Ocular Fixation on Caloric Nystagmus. Arch Otolaryngol. 1980;106(8):474–476. doi:10.1001/archotol.1980.00790320026007
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