Quadrantanopia
medical condition
Quadrantanopia, quadrantanopsia, refers to an anopia (loss of vision) affecting a quarter of the visual field.
It can be associated with a lesion of an optic radiation. While quadrantanopia can be caused by lesions in the temporal and parietal lobes of the brain, it is most commonly associated with lesions in the occipital lobe.
Presentation
An interesting aspect of quadrantanopia is that there exists a distinct and sharp border between the intact and damaged visual fields, due to an anatomical separation of the quadrants of the visual field. For example, information in the left half of visual field is processed in the right occipital lobe and information in the right half of the visual field is processed in the left occipital lobe.
In a quadrantanopia that is partial, there also exists a distinct and sharp border between the intact and damaged field within the quadrant.
The sufferer is able to detect light within the damaged visual field.
The prospects of recovering vision in the affected field are bleak. Occasionally, patients will spontaneously recover vision in the affected field within the first three months after the brain injury; however, vision loss remaining after this period of spontaneous recovery is traditionally thought to be permanent, certain companies now claim to be able to induce recovery of vision after this three-month period.
Homonymous inferior/superior quadrantanopia
Homonymous denotes a condition which affects the same portion of the visual field of each eye.
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This entry incorporates text from “Quadrantanopia” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.