Modifications were made to a Barany chair to allow an EyelinkII video eye tracker to be used for VOR measurements. The manufacturers had supplied the Eyelink with 940nm eye illumination LED's rather than the normal 925nm LED's. Nevertheless, some subjects were still able to see them after dark adaptation. Some optical interference filters were constructed in an attempt to eliminate the shorter wavelengths and prevent any possible impact on the VOR itself. This report describes the perceptual success of the filters, their effect on the physiological responses and on equipment performance. It also compares the use of the Eyelink and ENG for VOR measurements.
Kent NM, Davidson AW. Evaluation of optical filters for reducing visibility of Eyelink II illumination LED's during VOR testing. 19th British Ocular Motor Group Annual Meeting, Imperial College London (poster presentation), 7 December 2007.
Mr Adrian W. Davison, Freeman Unit, Newcastle upon Tyne. Tel: +44 (0)191-223-1370.
Regional Medical Physics Department, Newcastle General Hospital, Newcastle upon Tyne, NE4 6BE, UK.
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