Journal

The Japanese journal of neuropsychology

[Vol.21 No.2 contents]
Japanese/English

Full Text of this Article
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ArticleTitle Visual disorders and daily life
Language J
AuthorList Kazumi Hirayama
Affiliation Department of Behavioral Neurology and Cognitive Neuroscience, Tohoku University Graduate School of Medicine
Publication Japanese Journal of Neuropsychology: 21 (2), 84-97, 2005
Received
Accepted
Abstract We reported four cases with visual disorders after brain injury, and described the rehabilitation for the visual disorders of them.
1. A man developed a homonymous loss of visual field except for a part of left lower quadrant, after multiple cerebral infarctions. Using a modified method of Kerkhoff and Vianen (1994), he was trained to make saccadic eye movements toward affected regions to find targets, and to search and point to arranged targets. After the training, search field, accuracy and speed of pointing to the target, and daily activities improved.
2. A man developed a homonymous loss of visual field except for right upper quadrant, cerebral amblyopia, and cerebral achromatopsia, after multiple cerebral infarctions. As the sensitivity for contrast of color was preserved well, he was trained to make saccadic eye movements toward affected regions and to search and point to arranged targets using green targets as the training stimuli. After the training, his search field and pointing range increased in size for both green and white targets, and daily activities improved.
3. A case of visual variant of Alzheimer's disease presented a sort of visual form agnosia. She could localize and recognize forms defined by first-order features (luminance and color). However, examination of second-order features revealed that she was impaired in the detection of certain kinds of textures, all of which concerned with anti-texton, and in the recognition of forms defined by all kinds of textures. Pattern on pattern should be avoided in the environment of such patients.
4. The same patient described above complained of a glaze of vision, and showed reduction of contrast sensitivity for brightness in low spatial frequencies. With yellow glasses, her contrast threshold became significantly higher. Subjectively, she reported that she felt much at ease with the glasses, and started to wear them.
Keywords homonymous visual field disorder, practice of visual search, cerebral achromatopsia, textured form agnosia, yellow glasses

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