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John J. Sloper, Carolyn Garnham, Petrous Gous, Roger Dyason, Deborah Plunkett; Reduced Binocular Beat Visual Evoked Responses and Stereoacuity in Patients with Duane Syndrome. Invest. Ophthalmol. Vis. Sci. 2001;42(12):2826-2830.
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purpose. To study the effects that the abnormal eye movements of patients with
Duane retraction syndrome have on the development of binocular
methods. Pattern reversal visual evoked responses (VEPs) to 15-minutes-of-arc
and 60-minutes-of-arc checks and binocular beat VEPs to diffuse
sinusoidally modulated 18- and 20-Hz stimuli were recorded in 10
patients with Duane retraction syndrome who maintain binocular function
by using an abnormal head posture. Visual acuity, stereoacuity, and eye
movements were measured. The results have been compared to those from
10 normal subjects.
results. The patients with Duane retraction syndrome had reduced stereoacuity
compared to the normal control group (TNO mean, 82.5 seconds of arc
compared to 37.5 seconds of arc; Titmus mean, 143 seconds of arc
compared to 44 seconds of arc). The binocular beat VEPs showed a
significantly reduced difference beat response at 2 Hz in the patients
with Duane syndrome compared to normal subjects (mean signal-to-noise
ratio 2.40 ± 1.05 compared to 4.30 ± 2.66; t= 2.21, df = 18, P < 0.05).
Binocular enhancement of the P100 pattern reversal amplitude to
15-minute checks was increased in these patients, because of a
reduction of the monocular P100 amplitudes compared to the normal
conclusions. Patients with Duane syndrome who maintain binocular function using an
abnormal head posture have reduced stereoacuity and show
electrophysiological evidence of reduced cortical binocular
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