What is See-Saw Nystagmus?
In see-saw nystagmus one eye moves up + intorts & other eye moves down +extorts
Torsional component is conjugate
Vertical component is dysconjugate
1. Wave form is pendular or jerk
What are the types of See-Saw Nystagmus?
Pendular see-saw nystagmus
Seen in
- Suprasellar lesion
- Visual loss
- Joubert's syndrome
Jerk see-saw nystagmus: (Hemi see-saw nystagmus)
Half cycle is pendular with corrective half cycle jerky
Seen in
- lesions of INC (caudal thalamus-rostral midbrain)
See-Saw Nystagmus Pathogenesis:
Midbrain
Unilateral inactivation of INC
Sparing of riMLF
Afferent
- Bitemporal hemianopia.
- Visual loss-visuo-vestibular fibres
- Chiasmal miswiring
Reference Notes
What are the causes of Acquired Pendular nystagmus ?
What is Convergence-Retraction Nystagmus ?
Dissociated Jerk Nystagmus and causes
What is Rebound nystagmus and its causes?
What is Bruns's nystagmus?
What is Gaze evoked nystagmus?
Down-beat nystagmus and its causes
Upbeat nystagmus and its causes
What is the basic Pathophysiology of Nystagmus
Alexanders law in Nystagmus - A brief
