ISSN: 1300-0365
Dil: Türkçe
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Cortical Blindness
Cem EVEREKLİOĞLU*, İbrahim F. HEPŞEN**
* Uz.Dr., İnönü Üniversitesi Tıp Fakültesi, Turgut Özal Tıp Merkezi, Göz Hastalıkları AD,** Yrd.Doç.Dr., İnönü Üniversitesi Tıp Fakültesi, Turgut Özal Tıp Merkezi, Göz Hastalıkları AD, MALATYA
When bilateral retrochiasmal lesions from the beginning of the lateral geniculate body to the occipital cortex are present, there is a cortical blindness. However, cortical blindness is not usually permanent, may also be transient. Clinically, it manifests as the absence of vision in the presence of normal pupillary function and normal ocular findings. Eighty-percent of cases are caused by vascular lesions in patients over the age of 50 years. In infants, it most commonly occurs after hypoxic insults but may also arise as a sequela of meningitis, head trauma or metabolic derangement. Visual field abnormalities are the most important sign of cortically blind patients. The visual field defects from occipital lesions are typically congruous and there are macular sparing with temporal crescent. Homonymous hemianopsia and these three findings are characteristics of occipital lobe lesions. Computerized tomography (CT), magnetic resonance imaging (MRI), positron emission tomography (PET), visual evoked potentials (VEPs) and single photon emission computerized tomography (SPECT) are the tests to diagnose and predict the visual outcome of a cortically blind patient.Keywords: Cortical blindness, Perimetric congruence,
Macular sparing, Temporal crecentTurkiye Klinikleri J Ophthalmol 1999, 8:219-224
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