Ocular Rotation Axes during Dynamic Bielschowsky Head-Tilt Testing in Unilateral Trochlear Nerve Palsy

Weber, Konrad P.; Landau, Klara; Palla, Antonio; Haslwanter, Thomas; Straumann, Dominik

doi:10.1167/iovs.02-1223

Cited by 16 publications

(11 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These patients make these saccades after the end of the head impulse and they are easily seen, and these are the overt saccades which really are our hidden pulse sign. What we discovered, thanks to Konrad Weber [Weber et al, 2004] and others who did detail measurements with search coils during head impulses is that these people make these saccades actually during the head impulse stimulus itself. Now this person does make some extra saccades at the end, but if he or she made one during the head impulse, then there is no need to make one afterward.…”

Section: Computational Fluid Dynamics Model Of Endolymph Flow Around mentioning

confidence: 86%

Invited Lectures from a Spatial Orientation Symposium in Honor of Frederick Guedry, Day 1

Lawson¹,

Rupert²,

Raj³

et al. 2014

View full text Add to dashboard Cite

show abstract

Section: Computational Fluid Dynamics Model Of Endolymph Flow Around mentioning

confidence: 86%

Invited Lectures from a Spatial Orientation Symposium in Honor of Frederick Guedry, Day 1

Lawson¹,

Rupert²,

Raj³

et al. 2014

View full text Add to dashboard Cite

show abstract

“…While the stability of rotation axes is also preserved in patients with a one-sided trochlear nerve palsy, the rotation axis of the covered eye is rotated inward (Weber et al, 2004). As shown in Fig.…”

Section: Discussionmentioning

confidence: 97%

“…For the VOR paradigm, we used the dual search-coil technique, while for the saccade paradigm we chose 3D video-oculography to bypass the problem of saccadic torsional coil artifacts (Bergamin et al, 2004). -Part of the data presented in this paper originates from experiments that were published elsewhere (Weber et al, 2004) DS -5…”

Section: Introductionmentioning

confidence: 99%

Dynamic aspects of trochlear nerve palsy

Straumann

Bockisch

Weber

2008

Progress in Brain Research

View full text Add to dashboard Cite

Trochlear nerve palsy leads to kinematic aberrations of both the paretic and the unaffected eye. During dynamic head roll, the rotation axis of the covered paretic or unaffected eye deviates inward, while the rotation axis of the viewing paretic or unaffected eye aligns with the line of sight; this convergence of rotation axes increases with gaze moving in the direction of the unaffected eye. During downward saccades, the trajectories of both eyes curve towards the unaffected side; these curvatures increase when the head is rolled to the affected side and gaze directed to the unaffected side. Hence, during both vestibular evoked and saccadic ocular movements, the unaffected eye shows similar kinematic aberrations as the paretic eye. While aberrations of the paretic eye can be explained by decreased force of the superior oblique (SO) muscle, aberrations of the unaffected eye may be due to increased force parallel to the paretic SO in the unaffected eye in accordance with Hering's law. This law, which forms the basis of conjugate eye movements, also seems to govern eye displacements in unilateral eye muscle palsy. DS -1 ABSTRACTTrochlear nerve palsy leads to kinematic aberrations of both the paretic and the unaffected eye. During dynamic head roll, the rotation axis of the covered -paretic or unaffected -eye deviates inward, while the rotation axis of the viewing -paretic or unaffected -eye aligns with the line of sight; this convergence of rotation axes increases with gaze moving in the direction of the unaffected eye. During downward saccades, the trajectories of both eyes curve towards the unaffected side; these curvatures increase when the head is rolled to the affected side and gaze directed to the unaffected side. Hence, during both vestibular evoked and saccadic ocular movements, the unaffected eye shows similar kinematic aberrations as the paretic eye. While aberrations of the paretic eye can be explained by decreased force of the superior oblique muscle (SO), aberrations of the unaffected eye may be due to increased force parallel to the paretic SO in the unaffected eye in accordance withHering's law. This law, which forms the basis of conjugate eye movements, also seems to govern eye displacements in unilateral eye muscle palsy.

show abstract

“…The Bielschowsky head-tilt sign in unilateral trochlear nerve palsy, i.e. increased vertical and torsional divergence with the head tilted towards the affected eye, can be explained by inward tilt of the rotation axis of the covered eye during head oscillation about the naso-occipital axis [137]. This 'convergence' of ocular rotation axes is the result of decreased force by the SO of the covered paretic eye or, according to Hering's law, increased force parallel to the paretic SO in the covered unaffected eye.…”

Section: Disconjugate Eye Movements Evoked By Vestibular Stimulationmentioning

confidence: 99%

Disconjugate Eye Movements

Straumann

2007

Neuro-Ophthalmology

Self Cite

View full text Add to dashboard Cite

To foveate targets in different depths, the movements of the two eyes must be disconjugate. Fine measurements of eye rotations about the three principal axes have demonstrated that disconjugate eye movements may appear not only in the horizontal, but also in the vertical and torsional directions. In the presence of visual targets, disconjugate eye movements are driven by the vergence system, but they may also appear during vestibular stimulation. Disconjugate eye movements are highly adaptable by visual disparities, but under normal condition the effects of adaptation only persist when one eye is covered. Finally, disorders of the brainstem and cerebellum may lead to abnormal disconjugate eye movements that are often specific for the topography of the lesion. This chapter reviews the literature on the phenomenology of disconjugate eye movements over the last 15 years.

show abstract

Ocular Rotation Axes during Dynamic Bielschowsky Head-Tilt Testing in Unilateral Trochlear Nerve Palsy

Cited by 16 publications

References 17 publications

Invited Lectures from a Spatial Orientation Symposium in Honor of Frederick Guedry, Day 1

Invited Lectures from a Spatial Orientation Symposium in Honor of Frederick Guedry, Day 1

Dynamic aspects of trochlear nerve palsy

Disconjugate Eye Movements

Contact Info

Product

Resources

About