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Hermann D. Schworm, Jan Ygge, Tony Pansell, Gunnar Lennerstrand; Assessment of Ocular Counterroll during Head Tilt Using Binocular Video Oculography. Invest. Ophthalmol. Vis. Sci. 2002;43(3):662-667.
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purpose. According to recent literature, the presence and the amount of true
compensatory ocular counterroll is still debatable. The purpose of the
current study was to assess compensatory counterroll in response to
lateral head tilt using a new noninvasive recording technique, and,
furthermore, to find out whether the amount of counterroll is
influenced by the presence or absence of spatial orientation.
methods. Eye movement recordings were performed using the infrared
three-dimensional video oculography (3D-VOG) technique. Objective
cycloposition of five healthy individuals was measured in presumed
primary position and in head tilt positions of 15°, 30°, and 45°
to the right and left. The same paradigm was performed under three
viewing conditions: binocularly without spatial orientation and both
binocularly and monocularly with spatial orientation.
results. A consistent ocular counterroll corresponding to the amount of head
tilt was observed in all subjects. Maximum torsional amplitude was
10° at a 45° head tilt. The relative amount of compensation ranged
between 13% and 22% of the actual head tilt, decreasing with
increasing head tilt. Compensatory counterroll and torsional conjugacy
between both eyes revealed minor differences between the experimental
paradigms. Incomplete cycloductional reorientation in primary position
after head tilt was detected in all subjects, regardless of the
conclusions. A consistent compensatory ocular counterroll was demonstrated in
response to static lateral tilting of the head in healthy individuals.
The amplitude of counterroll and the gain of compensatory cycloversion
were higher than has been generally reported. Infrared 3D-VOG technique
was a reliable and comfortable method for the assessment of ocular
cycloduction. It can be considered to be a promising tool for advanced
evaluation of disturbances of the oblique eye
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