Hemianopsia Cortical

**Cortical hemianopia** is one of the types of cortical hemianopia, characterized by partial (more than 20 degrees of the visual field) loss of a quadrant of the visual field (and a predominance in the hemiography of the mesolateral localization of the loss) predominantly on the side of the visual hemisphere (or homolateral to it), caused by a lesion presigmoid fascicle (n. cort. medullaris, n. cortico-reticus posteriores) and (or) calcarine groove.