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Allison M. McKendrick, Algis J. Vingrys, David R. Badcock, John T. Heywood; Visual Dysfunction between Migraine Events. Invest. Ophthalmol. Vis. Sci. 2001;42(3):626-633.
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purpose. To evaluate interictal visual dysfunction in persons with migraine in
terms of spatiotemporal selectivity and location within the visual
methods. The vision of a group of 15 persons who had experienced migraine with
aura was compared with that of 15 normal age-matched control subjects.
A range of thresholds was measured to evaluate precortical (background
modulation, contrast thresholds for static, and moving stimuli), area
V1 (orientation discrimination and motion discrimination thresholds),
and higher order (global dot motion thresholds) visual processes.
Testing was performed centrally and at 10° in the superior visual
field. For each of the tests, the spatial and temporal parameters of
the stimuli were selected to bias detection toward either parvocellular
or magnocellular visual mechanisms.
results. No defects were found for parvocellular processes. Significant
(P < 0.05) losses were apparent with the
temporal background modulation method (16 Hz), orientation
discrimination (0.5 cyc/deg), and global dot motion tasks.
conclusions. Both cortical and precortical visual dysfunction were identified in
migraine group 7 days after the headache. This loss was selective for
targets with temporal modulation of approximately 16
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