What is Disconjugate eye Movement?
The goal of normal disconjugate eye movements is to direct the corre- sponding retinal points of the two eyes to a visual object that is nearer or farther than the previous object. Such vergence movements can also be smooth when the object of interest moves slowly in depth.
What causes abnormal eye movements?
Nystagmus is most commonly caused by a neurological problem that is present at birth or develops in early childhood. Acquired nystagmus, which occurs later in life, can be the symptom of another condition or disease, such as stroke, multiple sclerosis or trauma.
Which part of the brain controls movement of the eye?
Cranial nerve 3: The oculomotor nerve controls pupil response and other motions of the eye, and branches out from the area in the brainstem where the midbrain meets the pons.
What is considered abnormal eye movement?
Abnormal Eye Movements. Abnormal eye movements consist of the horizontal and, occasionally, the vertical jerking movements that are seizure manifestations, ocular bobbing, paroxysmal downgaze or upgaze, opsoclonus, ocular flutter, and nystagmus.
How are glissades similar to vergence eye movements?
Glissades are not vergence eye movements, although the dynamics are similar. INTRODUCTION There are three types of overshoot in saccadic eye movements: dynamic overshoot, glissadic overshoot, and static overshoot . These are shown in Fig. 1.
How are glissades produced in the saccadic system?
Glissades are the slow drifting eye movements occasionally seen at the end of saccadic eye movements. Glissades are hypothecated to be produced by mismatches in the pulse and step components of the motoneuronal controller signals. Glissades are not vergence eye movements, although the dynamics are similar.
Which is slower a saccade or a glissades?
Also found in: Dictionary, Thesaurus, Encyclopedia. a gliding involuntary movement of the eye in changing the point of fixation; it is a slower, smoother movement than is a saccade. adj., adj glissad´ic.
What are the three types of glissadic overshoot?
INTRODUCTION There are three types of overshoot in saccadic eye movements: dynamic overshoot, glissadic overshoot, and static overshoot . These are shown in Fig. 1. The return phases of the dynamic overshoot (A and C) have magnitudes of 0.5 deg, peak velocities of 45 deg/sec, and durations of 18 ms.