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The use of optic nerve sheath diameter (ONSD) for the assessment of ICP dates back to 1987 when Cennamo and colleagues [31] demonstrated a linear relationship between ICP and the sheath diameter measured with a trans-orbital ultrasound probe in an A-scan mode (principally equivalent to the time-of-the-flight measurements of the cranium diameter).
The fibers from the retina run along the optic nerve to nine primary visual nuclei in the brain, from which a major relay inputs into the primary visual cortex. A fundus photograph showing the back of the retina. The white circle is the beginning of the optic nerve. The optic nerve is composed of retinal ganglion cell axons and glia.
In-flight ultrasound shows proximal kinking and increased optic nerve sheath diameter (ONSD) of approximately 12 mm that is consistent with raised ICPs. Optic nerve shown in purple and the ONSD in green. Figure 10: MRI (R+30 days) of the fourth case of visual changes from long-duration spaceflight. There is prominence of central T2 ...
During the examination, a laser beam passes through the pupil opening onto the back of the eye and scans the optic nerve head and the retina. A three-dimensional image is generated from several tens of thousands of measuring points, which allows a quantitative assessment of all relevant anatomical structures: [5] disc cup (shape, asymmetry),
The optic tract is a continuation of the optic nerve that relays information from the optic chiasm to the ipsilateral lateral geniculate nucleus (LGN), pretectal nuclei, and superior colliculus. [14] The optic tract represents the first stage in the visual pathway in which visual information is transferred in a homonymous nature. [ 15 ]
OhioHealth Riverside Methodist Hospital is the largest member hospital of OhioHealth, a not-for-profit, faith-based healthcare system located in Columbus, Ohio.. As a regional tertiary care hospital, Riverside Methodist is host to a number of specialty centers and services, including Neuroscience and Stroke, Heart and Vascular, Maternity and Women's Health, Cancer Care, Trauma Center II, Hand ...
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In patients with headaches, the finding of swollen optic discs, or papilloedema, on fundus photography is a key sign, as this indicates raised intracranial pressure (ICP) which could be due to hydrocephalus, benign intracranial hypertension (aka pseudotumour cerebri) or brain tumor, amongst other conditions. Cupped optic discs are seen in glaucoma.
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