The degree of visual impairment is related to the extent of cortical involvement 1:. They measured his emotional response by electromyography and monitoring of pupil dilation. Blindsight, in some ways, can be considered a condition in which there is unawareness of awareness, although this term could be applied to certain forms of agnosia, especially anosoagnosia, or the unawareness of a body part. Furthermore, unawareness and denial of cortical visual loss is present in Anton’s syndrome. The blindsight experiment I found most interesting was performed on patient GY, who had cortical blindness in just one eye. Cortical visual impairment (CVI) is a term used to describe visual impairment that occurs due to brain injury. Researchers presented him with images of people demonstrating various emotional states. Cortical color blindness, or cerebral achromatopsia, has been likened by some authors to ‘‘blindsight’’ for color or an instance of ‘‘covert’’ processing of color. Visual recovery in cortical blindness is limited by high internal noise. Blindsight refers to a ‘visual capacity in a field defect in the absence of acknowledged awareness’. Cortical blindness is the total or partial loss of vision in a normal-appearing eye caused by damage to the brain's occipital cortex. Article 4 A Case of Blindsight to Sight Adrienne Chan, OD, Chicago, Illinois Vision Therapy and Low Vision Rehabilitation, SCO 2016-17 ABSTRACT Introduction: Visual consciousness is affected when the primary visual cortex is damaged. Cortical blindness is a condition resulting from lesions in the primary visual cortex (V1) characterized by visual impairment but with an intact anterior visual pathway (normal pupillary reflexes and fundal appearance).. Clinical presentation. Normal vision in humans is primarily mediated by the geniculo-striate pathway where the visual information is processed in a hierarchical order via the retina, the lateral geniculate nucleus (LGN) and the striate cortex. Journal of Vision in press. The primary visual cortex, or V1, is the principal telencephalic recipient of visual input in humans and monkeys. From blindsight to sight: Cognitive rehabilitation of visual field defects. Journal of Vision in press. However, sighted behavior can persist within the areas of cortical blindness. There are several different causes why a person would have cortical blindness that can include: Physical damage to your occipital cortex, which is the visual processing center of your cerebral cortex. Cortical Blindness Causes. Cavanaugh MR, Zhang R, Melnick MD, Das A, Roberts M, Tadin D, et al. Visual recovery in cortical blindness is limited by high internal noise. CVI differs from other types of visual impairment which are due to physical problems with the eyes. This phenomenon is called blindsight, and it describes the …