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Gudrun Bachmann, Manfred Fahle; Component Perimetry: A Fast Method to Detect Visual Field Defects Caused by Brain Lesions. Invest. Ophthalmol. Vis. Sci. 2000;41(10):2870-2886.
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purpose. Noise field campimetry, performed according to Aulhorn and Köst,
confronts patients with a large field of irregularly flickering dots,
and many patients immediately perceive their visual field defects. The
original method had a somewhat low specificity and sensitivity,
especially for patients with visual field defects caused by cortical
methods. The method was improved in two ways. First, the grain of the visual
noise was increased toward the periphery of the visual field to
accommodate the peripheral decrease in visual acuity. Second, the type
of stimulus pattern was varied to include separate investigations of
different visual components or functions (color, motion, temporal
resolution, line orientation, stereoscopic depth, acuity, and
figure–ground segmentation). To evaluate the reliability of the
method, the visual fields were compared, as assessed by the new method,
with those of conventional perimetry in 41 patients with neurologic
disorders and 22 normal control subjects.
results. The results were encouraging. All patients with suprageniculate lesions
subjectively experienced visual field defects in component perimetry.
Sizes of visual field defects obtained with both methods corresponded
qualitatively with each other, with a highly significant correlation.
The specificity of component perimetry was higher than that of the
original noise field campimetry.
conclusions. This pilot study indicates that component perimetry is a subjective but
relatively reliable method for detecting disorders of visual perception
caused by lesions at different stages along the visual pathway,
permitting fast screening of the visual field. In addition, this method
seems to allow examination of the visual field, not only for defects in
contrast sensitivity, as does conventional light perimetry, but also
for the status of other components of vision such as color or motion
perception. Further evaluation with larger patient cohorts is needed to
allow exact assessment of the clinical usefulness of the
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