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D. Yang, E. S. Hald, R. W. Hertle, Z. Tai; Vergence Induced by Optic-Flow Motion in Patients With Strabismus. Invest. Ophthalmol. Vis. Sci. 2009;50(13):2889.
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Subjects with strabismus have shown deficits in disparity vergence eye movements. We investigated how their damaged vergence system responded to optic flow motion in the ground plane.
Backward/forward motion of a sinusoidal grating pattern which does not have horizontal disparity was displayed on a computer monitor in the ground plane and binocular movements were recorded with a video-based eye tracking system (EyeLink 1000 desktop). Subjects looked at the center of the pattern for 5 seconds in each trial and various velocities and two different directions were randomized. Open-loop and closed-loop vergence velocities, amplitudes, and latencies were quantified and compared with normal subjects.
In normal subjects, involuntary horizontal vergence nystagmus was recorded. In patients, robust vergence nystagmus was also induced. The slow-phase velocity of open-loop vergence from strabimus subjects was higher than normal subjects and the latency of the initail responses was shorter than normal subjects. The closed-loop vergence from strabismus patients was as strong as normal subjects.
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