Influence of Caloric Nystagmus on Smooth Pursuit Eye Movements

Hiroaki Ichijo, Jiro Hozawa, Hideichi Shinkawa, Tsutomu Nishiyama
1993 Equilibrium Research  
In patients with peripheral vestibular disorders, spontaneous nystagmus is sometimes superimposed on smooth pursuit eye movements and reveals unilateral saccadic pursuit. To determine whether caloric nystagmus has an influence on smooth pursuit, we recorded horizontal eye tracking with cold water caloric stimulation in 12 normal subjects. We found that brisk caloric nystagmus was superimposed on smooth pursuit eye movements, and we measured slow phase velocity and fast phase velocity of the
more » ... rimposed nystagmus. The influence was great when tracking was in the same direction as caloric nystagmus. We suggest that saccadic pursuit indicates not only central disorders but also peripheral vestibular lesions.
doi:10.3757/jser.52.339 fatcat:udfs3klcffg6nmgjifni5wmnvq