PATHOLOGIC NYSTAGMUS
\pˌaθəlˈɒd͡ʒɪk nˈɪstaɡməs], \pˌaθəlˈɒdʒɪk nˈɪstaɡməs], \p_ˌa_θ_ə_l_ˈɒ_dʒ_ɪ_k n_ˈɪ_s_t_a_ɡ_m_ə_s]\
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Involuntary movements of the eye that are divided into two types, jerk and pendular. Jerk nystagmus has a slow phase in one direction followed by a corrective fast phase in the opposite direction, and is usually caused by central or peripheral vestibular dysfunction. Pendular nystagmus features oscillations that are of equal velocity in both directions and this condition is often associated with visual loss early in life. (Adams et al., Principles of Neurology, 6th ed, p272)
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