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Related Experiment Videos

Reading-evoked visual dimming

R S Manor1, Y Yassur, W F Hoyt

  • 1Department of Ophthalmology, Beilinson Medical Center, Sackler Faculty of Medicine, Tel-Aviv University, Petah-Tikva, Israel.

American Journal of Ophthalmology
|February 1, 1996
PubMed
Summary
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A patient experienced vision dimming while reading due to an orbital tumor compressing the optic nerve. This case suggests reading-evoked visual dimming may be a form of gaze-evoked amaurosis.

Area of Science:

  • Ophthalmology
  • Neuroradiology
  • Neuro-oncology

Background:

  • A 49-year-old monocular patient presented with a five-year history of intermittent central vision dimming in the left eye.
  • The visual disturbance was exclusively provoked by reading activities.

Observation:

  • Neuroradiologic imaging, including computed tomography (CT) and magnetic resonance imaging (MRI), was performed.
  • An intraconal tumor was identified at the orbital apex, positioned superior and lateral to the optic nerve.

Findings:

  • The tumor caused significant displacement of the optic nerve, both superiorly and laterally.
  • During reading, the optic nerve may be compressed between the tumor and the inferior rectus muscle, which contracts during this action.

Implications:

Related Experiment Videos

  • This case suggests that reading-evoked visual dimming can represent a variant of gaze-evoked amaurosis.
  • Understanding the mechanical interaction between orbital tumors, eye muscles, and the optic nerve is crucial for diagnosing and managing such visual disturbances.