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- Greyout abstract "A greyout (also whiteout; US English grayout) is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes: Shock, such as Hypovolemia, even in mild form such as when drawing blood. Suddenly standing up (see orthostatic hypotension), especially if sick, hungover, or suffering from low blood pressure. Positive g-forces as experienced by pilots or roller coaster riders. Paradoxically, hyperventilation: self-induced hypocapnia such as in the fainting game or in shallow water blackout. Overexertion Panic attackUsually recovery is rapid and a greyout can be readily reversed by lying down. This way, the cardiovascular system does not need to work against gravity for blood to reach the brain.A grey-out may be experienced by aircraft pilots pulling high positive g-forces as when pulling up into a loop or a tight turn forcing blood to the lower extremities of the body and lowering blood pressure in the brain. This is the reverse of a redout, or a reddening of the vision, which is the result of negative G forces caused by performing an outside loop, that is by pushing the nose of the aircraft down. Redouts are potentially dangerous and can cause retinal damage and hemorrhagic stroke. Pilots of high performance aircraft can increase their resistance to greyout by using a G-suit, which controls the pooling of blood in the lower limbs but there is no suit yet capable of controlling a redout. In both cases symptoms may be remedied immediately by easing pressure on the flight controls. Continued, or heavy G force will rapidly progress to g-LOC (G force induced Loss of Consciousness).Surprisingly, even during a heavy grey-out, where the visual system is severely impaired, pilots can still hear, feel, and speak. In other words, complete grey-out and loss of consciousness are separate events.Another common occurrence of greyouts are in roller coaster riders. Many roller coasters put riders through positive G forces, particularly in vertical loops and helices. Roller coasters rarely have high enough negative G forces to induce redouts, as most low-G elements are designed to simulate weightlessness.".
- Greyout thumbnail Grey_out_illustration.jpg?width=300.
- Greyout wikiPageID "5621896".
- Greyout wikiPageLength "3801".
- Greyout wikiPageOutDegree "31".
- Greyout wikiPageRevisionID "685844076".
- Greyout wikiPageWikiLink Blood_pressure.
- Greyout wikiPageWikiLink Category:Eye.
- Greyout wikiPageWikiLink Category:Visual_system.
- Greyout wikiPageWikiLink Choking_game.
- Greyout wikiPageWikiLink Eigengrau.
- Greyout wikiPageWikiLink G-LOC.
- Greyout wikiPageWikiLink G-force.
- Greyout wikiPageWikiLink G-suit.
- Greyout wikiPageWikiLink Hangover.
- Greyout wikiPageWikiLink Hyperventilation.
- Greyout wikiPageWikiLink Hypocapnia.
- Greyout wikiPageWikiLink Hypotension.
- Greyout wikiPageWikiLink Hypovolemia.
- Greyout wikiPageWikiLink Hypoxia_(medical).
- Greyout wikiPageWikiLink Orthostatic_hypotension.
- Greyout wikiPageWikiLink Panic_attack.
- Greyout wikiPageWikiLink Phosphene.
- Greyout wikiPageWikiLink Presyncope.
- Greyout wikiPageWikiLink Redout.
- Greyout wikiPageWikiLink Retina.
- Greyout wikiPageWikiLink Roller_coaster.
- Greyout wikiPageWikiLink Roller_coaster_elements.
- Greyout wikiPageWikiLink Shallow_water_blackout.
- Greyout wikiPageWikiLink Shock_(circulatory).
- Greyout wikiPageWikiLink Stroke.
- Greyout wikiPageWikiLink Syncope_(medicine).
- Greyout wikiPageWikiLink Tunnel_vision.
- Greyout wikiPageWikiLink Vertical_loop.
- Greyout wikiPageWikiLink File:Grey_out_illustration.jpg.
- Greyout wikiPageWikiLinkText "Greyout".
- Greyout wikiPageWikiLinkText "greyout".
- Greyout wikiPageUsesTemplate Template:Distinguish.
- Greyout wikiPageUsesTemplate Template:Reflist.
- Greyout subject Category:Eye.
- Greyout subject Category:Visual_system.
- Greyout hypernym Loss.
- Greyout type Disease.
- Greyout type Feature.
- Greyout type Thing.
- Greyout comment "A greyout (also whiteout; US English grayout) is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes: Shock, such as Hypovolemia, even in mild form such as when drawing blood.".
- Greyout label "Greyout".
- Greyout differentFrom Grayed_out.
- Greyout sameAs Q1404110.
- Greyout sameAs Greyout.
- Greyout sameAs Voile_gris.
- Greyout sameAs グレイアウト.
- Greyout sameAs m.0dwsmt.
- Greyout sameAs Greyout.
- Greyout sameAs Q1404110.
- Greyout wasDerivedFrom Greyout?oldid=685844076.
- Greyout depiction Grey_out_illustration.jpg.
- Greyout isPrimaryTopicOf Greyout.
