نتایج جستجو برای: downward vertical gaze palsy
تعداد نتایج: 142813 فیلتر نتایج به سال:
PURPOSE The rectus extraocular muscles pass through fibromuscular connective tissue pulleys that stabilize muscle paths and control the direction of muscle pull. The authors investigated whether abnormal forces associated with superior oblique palsy can cause displacement of pulleys and muscle paths. METHODS Coronal magnetic resonance imaging (MRI) showing significantly reduced superior obliq...
Progressive supranuclear palsy is a neurodegenerative disease which aVects the brainstem and basal ganglia. Patients present with disturbance of balance, a disorder of downward gaze and L-DOPA-unresponsive parkinsonism and usually develop progressive dysphagia and dysarthria leading to death from the complications of immobility and aspiration. Treatment remains largely supportive but, potential...
In five normal subjects, we analyzed uncalled for torsion (blips) during and after horizontal and vertical saccades. Torsion was defined as movement out of Listing's plane. During horizontal saccades in downward gaze the abducting eye extorted and the adducting eye intorted. The direction of the blips reversed in upward gaze. Peak torsional amplitudes (up to 1-2 deg) were always reached during ...
The pathomechanism of downbeat nystagmus (DBN) remains controversial but each mechanism has to account for 1) its gazeevoked vertical centripetal component which increases on down and lateral gaze,1 and 2) the vertical bias component of the upward slow phase velocity (SPV) in gaze straight ahead. The vertical velocity bias of DBN has a gravity-dependent component which leads to maximal drift ve...
The pathomechanism of downbeat nystagmus (DBN) remains controversial but each mechanism has to account for 1) its gazeevoked vertical centripetal component which increases on down and lateral gaze,1 and 2) the vertical bias component of the upward slow phase velocity (SPV) in gaze straight ahead. The vertical velocity bias of DBN has a gravity-dependent component which leads to maximal drift ve...
OBJECTIVE To identify a biomarker for predicting the appearance of vertical supranuclear gaze palsy (VSGP) in patients affected by progressive supranuclear palsy-parkinsonism (PSP-P). METHODS Twenty-four patients with PSP-P were enrolled in the current study. Patients were clinically followed up every 6 months until the appearance of VSGP or the end of the follow-up (4 years). Participants un...
CLINICAL PEARLS Lesions of the fourth (trochlear) cranial nerve cause vertical or oblique diplopia by impairing the ability of the superior oblique muscle to intort and depress the eye. This binocular diplopia worsens in downgaze and lateral gaze away from the affected eye. Because intorsion is necessary to maintain fusion in ocular counter-roll, this diplopia also worsens with head tilt toward...
Purpose: To investigate response to visual stimuli and visual search patterns of users with cerebral palsy and using that information to facilitate developing eye gaze controlled interaction system. Methodology: Conducted two studies using eye gaze tracker – the first study analyzed gaze positions for a visual stimulus rendered for 2 secs while the second study analyzed sequence of selecting el...
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