Related Experiment Video
Updated: Jan 23, 2026

Optic Nerve Sheath Point of Care Ultrasound: Image Acquisition
Published on: August 18, 2023
The rapid improvement in visual field defect observed with weekly perimetry during intensity-modulated radiotherapy
Toshihiko Inoue1, Osamu Mimura2, Koji Ikenaga1
1Ashiya Radiotherapy Clinic Nozomi, 3-84 Yoko-cho, Ashiya, Hyogo 659-0034 Japan.
Abstract:
During precision radiotherapy to treat optic nerve sheath meningioma, early improvement in visual function has been seen. This has been difficult to explain biologically. In the present study, we aimed to investigate this rapid improvement in visual function. To this end, we prospectively tested a single patient's visual field (VF) using Humphrey automated perimetry at weekly intervals. The patient exhibited significant stepwise improvement in VF during an intensity-modulated radiotherapy course.
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