Studies on Corneo-Retinal Potentials during ENG Test

• Published in: Equilibrium Research Vol. 58; no. 6; pp. 626 - 631
• Main Authors: Mano, Hidejiro, Takemori, Setsuko
• Format: Journal Article
• Language: English
• Published: Japan Society for Equilibrium Research 1999
• Subjects: calibration; corneo-retinal potentials; dark adaptation; electronystagmogaphy; light adaptation
• ISSN: 0385-5716; 1882-577X
• DOI: 10.3757/jser.58.626

Changes of Corneo-Retinal Potentials (CRP) were studied during routine equilibrium function tests and various visual conditions in healthy subjects. The changes in CRP were measured by amplitudes of horizontal 10° calibration. 1. In routine examinations, CRPs showed increased or decreased responses after each examination. 2. CRPs mostly increased after OKP tests during routine equilibrium function tests. However, in the examinations of OKN of 30°/sec, 60°/sec, and 90°/sec, CRPs showed similar increases for each OKN velocity. In the younger group (21-39 years), the CRPs were more increased than those in the older group (65- years) after OKP test. When OKP test was performed two times, there were no significant differences between the CRPs caused by the first examination and the second one. 3. CRPs showed a response decline after caloric test. 4. CRPs were examined every two minutes after electrodes were placed on the subjects, in an illuminated room with eyes open. The CRPs increased gradually until 8 minutes later. With eyes closed in an illuminated room, and with eyes open and closed in a dark room, CRPs decreased until 8 minutes later. 5. CRPs during equilibrium function tests were changed by visual conditions (light or dark). However they were not changed by eye movements.