Greyout
Greyout
Greyout (pronounced: /ˈɡreɪaʊt/) is a medical condition characterized by a loss or reduction of color vision, causing the visual field to appear as if it is being viewed through a grey mist or fog. This condition is often associated with G-force induced loss of consciousness (G-LOC), but can also occur due to other medical conditions such as migraines, hypoglycemia, or orthostatic hypotension.
Etymology
The term "greyout" is derived from the English words "grey," referring to the color, and "out," indicating a loss or reduction. It was first used in the context of aviation medicine to describe the visual symptoms experienced by pilots exposed to high G-forces.
Symptoms
The primary symptom of greyout is a reduction in color vision, causing the visual field to appear grey. This may be accompanied by other symptoms such as dizziness, nausea, and blurred vision, depending on the underlying cause.
Causes
Greyout is most commonly associated with G-LOC, a condition that occurs when the force of gravity is significantly greater than that on Earth's surface. This can cause blood to be pulled away from the brain, leading to a temporary loss of consciousness and vision. Other potential causes of greyout include migraines, hypoglycemia, and orthostatic hypotension.
Treatment
Treatment for greyout primarily involves addressing the underlying cause. For example, if greyout is caused by G-LOC, the individual may need to undergo training to better tolerate high G-forces. If greyout is due to a medical condition such as hypoglycemia, treatment may involve managing blood sugar levels.
Related Terms
External links
- Medical encyclopedia article on Greyout
- Wikipedia's article - Greyout
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