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NS38 - Optic Pathway, Lesions, Visual Reflexes (i) (Optic N (extension of…
NS38 - Optic Pathway, Lesions, Visual Reflexes (i)
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inside orbit
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Ns (II, III, V1 (nasociliary + lacrimal), VI)
Optic pathway
eye
ganglion cell axons
optic disc
CN II
optic canal
optic chiasma
optic tracts
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damage to tract/radiations -> contralat homonymous hemianopsia (visual loss on ipsilat. side of each retina, i.e. if left tracts damaged, left sides of retina lost, right side of visual field lost)
pit stalk underneath (pit hypertrophy/tumour -> optic chiasma compression -> bitemporal hemianopsia (tunnel vision)
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Perimetry
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nasal step: scotomata (island like black blindspots) in nasal field, forms horizontal step-like defect
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Papilloedema
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usually bilateral, unilateral v rare
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