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Optic nerve damage is progressive and insidious. Some of patients will develop some peripheral field defects. These can include nasal step defects, enlarged blind spots, arcuate scotomas, sectoral field loss and altitudinal defects. [6] Clinical symptoms correlate to visibility of the drusen. [13]
These include general surgical procedures, cataract surgery, hemorrhagic shock, certain medications, and optic disc drusen. The exact mechanism of optic nerve ischemia in these cases remains unclear, but contributing factors may include hypotension, anemia, hypoxia, and changes in the autoregulation of optic nerve arterial blood flow. The ...
Drusen associated with aging and macular degeneration are distinct from another clinical entity, optic disc drusen, which is present on the optic nerve head. [2] Both age-related drusen and optic disc drusen can be observed by ophthalmoscopy. Optical coherence tomography scans of the orbits or head, calcification at the head of the optic nerve ...
Two large studies from the University of Southern Denmark suggest that the diabetes medication Ozempic doubles the risk of developing NAION, a rare but serious condition that damages the optic nerve.
The optic nerve is the bundle of axons that carry the visual signals from the eye to the brain. This optic nerve must penetrate through the wall of the eye, and the hole to accommodate this is usually 20-30% larger than the nerve diameter. In some patients the optic nerve is nearly as large as the opening in the back of the eye, and the optic ...
NAION develops from insufficient blood flow to the optic nerve and causes sudden painless vision loss in one eye. It is the second most common cause of blindness due to optic nerve damage, after ...