title: Crossed-quadrant homonymous hemianopsia. The "checkerboard" field defect.
abstract: A 70-year-old man with a history of hypertension and coronary artery disease suffered an abrupt loss of vision in June 1980. Neuro-ophthalmologic examination in August 1981 revealed 20/20+ acuity in both eyes, but quantitative perimetry disclosed a classic crossed-quadrant homonymous hemianopsia. This is known as the "checkerboard" visual field defect; a right upper quadrantanopsia as well as a left lower quadrantanopsia. A review of the eight previously reported cases is presented. A trial with "checkerboard" Fresnel prisms gave only a slight improvement in ambient field in this patient. The significance of that point is discussed. To our knowledge, this is the first patient with a "checkerboard" occipital lobe infarction pattern documented by computed tomography.
mesh_terms: D000368:Aged; D002544:Cerebral Infarction / Q000150:complications* / Q000000981:diagnostic imaging; D003117:Color Vision Defects / Q000150:complications; D005139:Eyeglasses / Q000592:standards; D005260:Female; D006423:Hemianopsia / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy; D006429:Hemiplegia / Q000150:complications; D006801:Humans; D008297:Male; D008875:Middle Aged; D009778:Occipital Lobe / Q000098:blood supply* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed; D014794:Visual Fields