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Assessment of Static Graviceptive Perception in the Roll-Plane using the Subjective Visual Vertical Paradigm
Published on: April 28, 2020
Vertical vergence adaptation produces an objective vertical deviation that changes with head tilt.
Kristina Irsch1, David L Guyton, Nicholas A Ramey
1Wilmer Eye Institute, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21287-9028, USA. kirsch1@jhmi.edu
Investigative Ophthalmology & Visual Science
|April 11, 2013
Summary
Vertical vergence training in healthy individuals can induce temporary vertical deviations that change with head tilt, mimicking superior oblique muscle paresis (SOP). This suggests training may help reduce such deviations.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Vertical fusion is crucial for maintaining single binocular vision.
- Understanding the ocular motor mechanisms of vertical fusion is essential for diagnosing and treating certain visual disorders.
- Superior oblique muscle paresis (SOP) can cause vertical deviations and compensatory head tilting.
Purpose of the Study:
- To document the cyclovertical ocular motor mechanism for vertical fusion in healthy subjects.
- To investigate if vertical vergence training can induce vertical deviations mimicking SOP.
- To explore mechanisms of misalignment in normal ocular motor systems.
Main Methods:
- Seven healthy subjects underwent adaptation to vertical image disparities using a tilting haploscopic eye-tracking apparatus.
- Eye positions were recorded with the head straight and tilted (45 degrees left/right) during binocular and monocular viewing.
- Vertical fusional vergence was assessed.
Main Results:
- Vertical fusional vergence involved cycloversion, with oblique muscle involvement.
- Adaptation to vertical disparities induced temporary vertical deviations.
- These deviations increased with head tilt to one side and decreased with tilt to the other.
Conclusions:
- Head-tilt-dependent vertical deviations are not exclusive to SOP.
- Mechanisms mimicking SOP can arise in normal visual systems.
- Vertical vergence training may help reduce deviations and head tilt, potentially serving as an alternative to surgery.
Keywords:
Bielschowsky head tilt testbasic cyclovertical deviationsuperior oblique paresisvertical vergence adaptationvideo-oculographyMore Related Videos
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