S 042 Augeninfarkt / AION optic neuropathy
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Duration: 00:29.
Uploaded on: 23/02/2010.
Als Augeninfarkt bezeichnet man den akuten Verschluss einer den Sehnerven versorgenden Augenarterie im Zinn-Haller-Gefäßkranz, worauf der Sehnervenkopf zu wenig durchblutet und damit ungenügend mit Sauerstoff und Nährstoffen versorgt wird. Betroffene einer AION bemerken einen plötzlich auftretenden, ein Auge betreffenenden deutlichen Verlust der Sehschärfe. Das betroffene Auge kann das Sehvermögen sogar ganz verlieren, sodass Betroffene auf diesem Auge erblinden.
Anterior Ischemic Optic Neuropathy (AION) is a potentially visually devastating disease that occurs in the middle aged and the elderly. This condition is often referred to as a stroke of the optic nerve, and it usually begins suddenly with little warning in one eye, but frequently progresses to the other eye over time. Vision loss often includes both the loss of visual field and visual acuity which can vary from being nearly normal to severely impaired. The unexpected sudden visual acuity and visual field loss makes AION a particularly overwhelming disease for many patients.
Anterior Ischemic Optic Neuropathy is caused by an acute impairment to the circulation of the arteries supplying the optic nerve. This transient poor circulation occurs due to a temporary fall in blood pressure to the point that there is not enough blood pressure to fully perfuse the vessels supplying the optic nerve. There are many mechanisms for this fall in blood pressure, and it can be caused by a variety of different factors.