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29 lis 2020 · Understanding the anatomy of the optic nerve and visual pathways is key to appreciating how various focal lesions of the brain cause characteristic visual field defects.
The visual pathway consists of structures that carry visual information from the retina to the brain. Lesions in that pathway cause a variety of visual field defects. In the visual system of human eye, the visual information processed by retinal photoreceptor cells travel in the following way:
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.
visual pathway. may lead to visual disturbances or visual loss, the pattern of which can help determine the exact location of the lesion. Unilateral. visual field. loss indicates a prechiasmal pathology, while bilateral. visual field. loss indicates a systemic, chiasmal, or retrochiasmal pathology.
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.
Fuchs coloboma (aka tilted disc syndrome) is associated with bitemporal loss that resolves with proper correction. Toxic/hereditary/nutritional optic neuropathy is associated with bilateral cecocentral VF loss, which can mimic bitemporal loss. Visual field defects characteristic of toxic and metabolic optic neuropathies.
19 gru 2022 · This anomaly helps eye healthcare professionals in the assessment of the site of the lesion along the visual pathway, which produces well-described visual field defects, also known as hemianopias, posterior, or at the chiasm (see Image. Visual Pathway).
