Assertion: optic nerve sheath fenestration | /r/HasProperty | indicated
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Source sentences:
text: Optic nerve sheath fenestration (ONSF) is indicated if despite of all these measures, there is either a progression in symptoms such as a decrease in visual acuity, diplopia, transient visual obscurations or headache or a progression in signs such as an increase in visual field defects, lateral rectus paresis or papilledema.