What is seesaw nystagmus?
1966;76(5):668-675. doi:10.1001/archopht.1966.03850010670008. Seesaw nystagmus is a sequence of abnormal eye movements in which one eye moves up as the other moves down. In addition to the alternating opposed vertical movements, there is rotation (torsion) of the eyes.
What is ocular flutter?
Ocular flutter is a rare oculomotor syndrome that is clinically defined by intermittent bursts of involuntary conjugate eye oscillations with a strict preponderance for the horizontal plane and without intersaccadic interval.
What are the different types of nystagmus?
There are two types of nystagmus. In pendular nystagmus, the eye motion is like a pendulum swinging back and forth. Jerk nystagmus, the more common type, is characterized by eyes that drift slowly in one direction and then jerk back the other way.
What causes ocular bobbing?
`Typical’ ocular bobbing occurs in patients with paralysis of horizontal conjugate eye movements and consists of abrupt, spontaneous downward jerks of the eyes with a slow return to the mid position. The `monocular’ type reflects co-existing unilateral third nerve paresis in addition to the bobbing.
What is Bruns nystagmus?
Bruns nystagmus primarily is a form of jerk nystagmus, characterised by alternating slow and fast components. After focusing an object on the fovea, failure of gaze-holding results in the deviation of the eyes, contributing to the slow component of the nystagmus.
What is Rotary nystagmus?
Torsional (rotary) nystagmus refers to a rotary movement of the globe about its anteroposterior axis. Torsional nystagmus is accentuated on lateral gaze. Most nystagmus resulting from dysfunction of the vestibular system has a torsional component superimposed on a horizontal or vertical nystagmus.
What causes Opsoclonus?
Causes of OMAS OMAS may be caused by an immune reaction to a tumor called neuroblastoma or an immune reaction to a viral illness. The immune reaction causes the body to produce antibodies to the cerebellum, which is located in the back of the brain.
What does ocular flutter look like?
Ocular flutter consists of bursts of moderately large-amplitude, horizontal, back-to-back saccades without intersaccadic intervals. Blurred vision and oscillopsia usually are present.
What type of nystagmus is HGN?
Horizontal Gaze Nystagmus
Horizontal Gaze Nystagmus (HGN) is a form of jerk nystagmus where the saccadic movement is towards the direction of the gaze. HGN is an involuntary motion that is not controlled by the subject.
What part of the eye is affected by nystagmus?
The involuntary eye movements of nystagmus are caused by abnormal function in the areas of the brain that control eye movements. The part of the inner ear that senses movement and position (the labyrinth) helps control eye movements.
What is upbeat nystagmus?
Upbeat nystagmus is a type of central vestibular nystagmus. It can be caused by lesions from the medulla to the midbrain. It usually increases in up gaze, but not on lateral gaze, and fixation does not dampen it.