optic disc oedema

optic disc oedema

Swelling of the head of the optic nerve, as seen with an OPHTHALMOSCOPE at the inside of the back of the eye. Optic disc oedema may be a sign of optic nerve inflammation but commonly indicates a rise in the pressure within the skull from any cause, such as a brain tumour. It is thus a sign of high clinical significance. Also known as PAPILLOEDEMA.
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The second most common local cause of optic disc oedema were AION 6% cases between 50-60 years of age.
The third most common local cause of optic disc oedema was BRAO in 2% cases in age group of 41-50yr.
Others include inflammatory disorders like optic neuropathy6 optic disc hyperaemia optic disc oedema subconjunctival haemorrhage5 and retinal vein occlusion9.
Images in the regional winner category captured toxoplasmosis (Katie Naphthan, Horsham, UK), optic disc oedema (Rob Millard, Harpurhey, UK), papilloedema (Darren Sheward, Moonee Ponds, Victoria, Australia) and chorioretinal scarring (Anthony Sheen, East Maitland, New South Wales, Australia).
There is vasoconstriction of the posterior ciliary arteries supplying the optic nerve head, which leads to optic disc oedema.
Optic nerve ischaemia most frequently occurs at the optic nerve head, where structural crowding of nerve fibres and reduction of the vascular supply may combine to impair perfusion to a critical degree and produce optic disc oedema.