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Wendy E. Marshman, Emma Dawson, Majella M. Neveu, Michael J. Morgan, John J. Sloper; Increased Binocular Enhancement of Contrast Sensitivity and Reduced Stereoacuity in Duane Syndrome. Invest. Ophthalmol. Vis. Sci. 2001;42(12):2821-2825.
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purpose. To compare the binocular enhancement of contrast sensitivity and
stereoacuity in patients with Duane syndrome and normal subjects.
methods. Monocular and binocular contrast sensitivity functions were determined
using a two-alternative, forced-choice method in 14 patients with Duane
syndrome and 14 normal subjects. Monocular and binocular log minimum
angle of resolution (logMAR) acuities were measured, and stereoacuity
was determined using the Titmus and TNO stereotests.
results. In the patients with Duane syndrome, the binocular enhancement of
contrast sensitivity was increased across all spatial frequencies,
although stereoacuity was reduced compared to that of the normal
subjects. The increased enhancement was caused by a reduction in
monocular contrast sensitivity rather than an increase in binocular
contrast sensitivity. The patients with Duane syndrome also showed a
generalized reduction of contrast sensitivity at high spatial
conclusions. It is suggested that the combination of reduced stereoacuity and
increased binocular enhancement of contrast sensitivity seen in Duane
syndrome can be explained by a partial loss of binocular cortical
cells, caused by intermittent misalignment of the eyes during early
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