Eye patching biases spatial attention after thalamic hemorrhage in a patient without spatial neglect: a case report.
Monocular patching has been advocated as a treatment for spatial neglect. Eye patching, however, is also reported to increase spatial bias. Thus, patching brain injury patients for ocular conditions may also impair their attention. To learn if an eye patch may induce asymmetric attention in a patient without spatial neglect, we tested a woman with diplopia after a left thalamic-intraventricular hemorrhage. She had no spatial neglect on bedside attention tasks. Using a laser pointer, she bisected a blank space at near (279 mm) and far (914 mm) distances under 3 conditions: unpatched and wearing a right or left eye patch. Unpatched, she showed no bias. She erred further leftward with right patching at both distances. Right eye patching appeared to induce neglect of right space when the patient performed this task. With left patching, leftward error tended to increase in near space only. Clinicians prescribing eye patches to patients with brain injury even for purely ocular indications, should evaluate them for spatial neglect once the patch is in place.
Barrett
Anna M
AM
Department of Neurology, Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA 17033, USA. amb33@psu.edu
Crucian
Gregory P
GP
Heilman
Kenneth M
KM
D000328:Adult; D001165:Arteriovenous Malformations / Q000150:complications; D001288:Attention / Q000502:physiology*; D001458:Bandages; D004172:Diplopia / Q000209:etiology; D005260:Female; D006801:Humans; D020300:Intracranial Hemorrhages / Q000150:complications* / Q000209:etiology; D013028:Space Perception / Q000502:physiology*; D013788:Thalamus / Q000473:pathology*; D015349:Vision, Monocular / Q000502:physiology*