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Related Concept Videos

Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
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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, whereas...
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Updated: May 18, 2026

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[High-altitude retinopathy].

N Pardiñas Barón1, F Fernández Fernández, F Fondevila Camps

  • 1Servicio de Oftalmología,Mutua de Accidentes de Zaragoza (MAZ), Zaragoza, España. alvaflama@yahoo.es

Archivos De La Sociedad Espanola De Oftalmologia
|October 2, 2012
PubMed
Summary
This summary is machine-generated.

Sudden vision loss in mountaineers at high altitudes can be caused by retinal hemorrhage. Macular involvement leads to severe vision decrease, with uncertain outcomes.

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Area of Science:

  • Ophthalmology
  • Altitude Medicine
  • Mountaineering Medicine

Background:

  • High altitude expeditions pose significant health risks.
  • Retinal hemorrhage is a known complication of extreme altitude exposure.

Observation:

  • A 36-year-old male expedition member experienced sudden vision loss at 8,167 meters in the Himalayas.
  • The patient was participating in an expedition on the Daulaghiri peak.

Findings:

  • High altitude retinal hemorrhage is common above 5,500m.
  • While often asymptomatic, macular involvement causes dramatic vision loss.
  • The long-term consequences of macular hemorrhage at high altitudes remain uncertain.

Implications:

  • Awareness of high altitude retinal hemorrhage is crucial for mountaineers.
  • Prompt diagnosis and management are essential, especially with macular involvement.
  • Further research is needed to understand and mitigate the risks of vision loss at extreme altitudes.