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29 lis 2020 · Visual field defects. At the optic chiasm, fibres from the nasal half of the retina, corresponding to the temporal visual field, decussate. Lesions compressing the chiasm, such as pituitary adenomas, therefore cause bitemporal hemianopia. Lesions to optic radiations result in homonymous contralateral quadrantanopia.
Tumours and other compressive lesions could often present with visual impairment and/or visual field defects. Careful clinical assessment could aid in accurate diagnosis of the cause of the visual field defect and loss of vision.
14 wrz 2022 · Knowing the patterns of visual deficits can help to diagnose and manage patients. Learn components of the visual pathway as well as the types of defects that may result from a lesion along the pathway through this article and the corresponding illustrated cheat sheet.
Bitemporal defects are the result of a lesion impacting the central portion of the chiasm, whereas binasal. defects stem from lesions affecting the lateral portions of the chiasm. The temporal retinas are responsible for the nasal visual fields. Nasal VF.
1 wrz 2023 · Lesions can affect any portion of the visual pathway, and they may have a characteristic presentation. A complete ophthalmic exam, with emphasis on disc appearance, visual field defects, and pattern of nerve fiber loss on OCT helps in localizing the lesion.
When affecting the visual pathway, mass effect can cause a multitude of changes in a patient’s visual field. Specific visual field deficits can be attributed to the location of compression, which in turn can help clinicians localize lesions based on physical examination and diagnostic testing.
28 lut 2013 · Visual field defects are a conglomerate of patterns of visual impairment derived from diseases affecting the optic nerve as it extends from the globe to the visual cortex. They are complex signs requiring perimetry or visual confrontation for delineation and are associated with diverse aetiologies.
