Vision problem during rapid flight deceleration

• Vision problem from high negative-G manoeuvres
• Pilot's vision problem

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Redoubt \Re*doubt"\ (r?*dout"), n. [F. redoute, fem., It. ridotto, LL. reductus, literally, a retreat, from L. reductus drawn back, retired, p. p. of reducere to lead or draw back; cf. F. r['e]duit, also fr. LL. reductus. See Reduce , and cf. Reduct ...

Wikipedia Word definitions in Wikipedia
A redout occurs when the body experiences a negative g-force sufficient to cause a blood flow from the lower parts of the body to the head. It is the inverse effect of a greyout , where blood flows away from the head to the lower parts of the body. Usually, ...