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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Related Experiment Video

Updated: Nov 27, 2025

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
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Transient Monocular Visual Loss: When Is It an Emergency?

Trishal Jeeva-Patel1, Anna Kabanovski2, Edward Margolin1

  • 1Department Ophthalmology and Vision Sciences, Toronto, Ontario, Canada; Faculty of Medicine, University of Toronto, Faculty of Medicine, Toronto, Ontario, Canada.

The Journal of Emergency Medicine
|December 5, 2020
PubMed
Summary
This summary is machine-generated.

Transient monocular vision loss (TMVL) can signal serious underlying conditions like retinal ischemia or giant cell arteritis. Prompt evaluation is crucial for preventing stroke and vision loss.

Keywords:
retinal TIAtransient monocular visual losstransient visual loss

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Area of Science:

  • Neurology
  • Ophthalmology
  • Vascular Medicine

Background:

  • Transient monocular vision loss (TMVL) necessitates emergency department evaluation to rule out critical conditions.
  • Identifying retinal ischemia or giant cell arteritis is paramount due to associated risks of stroke and vision loss.

Observation:

  • A 65-year-old man presented with recurrent episodes of transient monocular vision loss.
  • Initial ophthalmologic examination and inflammatory markers were normal, but CT angiogram revealed significant internal carotid artery plaque.
  • The patient was treated with dual antiplatelet therapy and carotid stenting, remaining symptom-free.

Findings:

  • Retinal ischemia, a cause of TMVL, carries a high risk of cardiovascular events and death, similar to transient brain ischemia.
  • Cerebrovascular accident risk is highest within 48 hours of TMVL, underscoring the need for urgent investigation.

Implications:

  • Emergency physicians must be aware of the high cardiovascular and cerebrovascular risks associated with TMVL due to retinal ischemia.
  • Urgent ophthalmologic examination, followed by inflammatory marker checks and stroke prevention protocols if indicated, is essential.
  • Timely medical or surgical intervention for carotid artery disease significantly reduces morbidity and mortality in TMVL patients.