A computer program has been developed for on-line analysis of routine
electronystagmography (ENG) tests. With this system, data acquisition
of eye movements and stimulus signals obtained from ENG are accomplish
ed at a rate of 200 Hz through a 12-bit analog-digital converter. A sm
all spotlight for eye tracking tests is sinusoidally driven by a compu
ter-generated analog signal. Six aptokinetic stripes projected onto a
screen are also controlled by the computer. Seven spots for saccade te
sts can be turned on or off based on digital signals produced through
a digital output device. There are three types of eye movements in thi
s series: nystagmus, pursuit eye movement and saccadic eye movement. A
n algorithm for the analysis of different eye movements is described i
n this paper. Recent significant advances in computer technology make
it possible to perform such complicated tasks and to accomplish quanti
tative assessment of any type of eye movements in routine ENG tests. C
onsequently, computer analysis provides clues to the location of a dis
ease and is very useful as a diagnostic tool in routine ENG testing.