What does the term "Red-out" mean?
"Red-out" is a term used to describe a visual phenomenon that can occur when a person experiences a high acceleration force, typically in aviation or aerospace contexts. It refers to a condition where the vision becomes dominated by the color red due to blood pooling in the head and eyes.
Mechanism:
- Blood Pooling: During a rapid pushing the nose down in an aircraft, blood can accumulate in the upper part of the body, including the eyes. During negative G forces (where the force is directed upwards relative to the body), blood tends to move away from the head towards the lower body due to gravity.
- Visual Effects: As blood accumulates in the eyes, it can distort the retina and affect vision. The increased pressure can cause the retinal arteries to dilate, leading to a reddish appearance in the visual field.
Symptoms:
- Red Vision: The individual perceives their vision as being filled with a red tint or completely red.
- Blurred Vision: Vision may become blurry or distorted due to the physical effects on the eyes.
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