The Application of Smooth Pursuit Eye Movement Analysis to Clinical Medicine
Final rept. 1 Oct 1992-30 Sep 1993
ARMSTRONG LAB BROOKS AFB TX
Pagination or Media Count:
We analyzed pursuit racking eye movements from selected neurological patients and compared them to the responses of 20 normal subjects. The patientssubjects tracked a small spot of light moving sinusoidally in the horizontal plane at a frequency of 0.4 Hz and a peakto-peak amplitude of 40 . The eye-movement responses were separated into a smooth-pursuit component and a saccadic component. We calculated the asymmetry as well as the gain and phase response of the smooth-pursuit component. The saccadic component was quantified by calculating the percentage of the total tracking movement contributed by the saccadic system. The patients with smooth-pursuit impairment exhibited a higher percentage of saccadic tracking and a lower smooth pursuit gain compared to the normal subjects. one patient with a unilateral lesion exhibited significant asymmetry in the smooth-pursuit component. In this case, the direction of the asymmetry indicated the side of the lesion. Eye movements, Smooth pursuit tracking, Ocular tracking saccades.
- Anatomy and Physiology
- Medicine and Medical Research