Maxwell writes:

The VISUAL effects of positive and negative Gs.

Vision goes first when a pilot experiences positive Gs. It goes dark. The
simulator darkens the screen when this happens.

The simulator does the same for redouts with negative Gs. The first time I
saw it, it took a while to figure out what it was. It only happens in
high-performance aircraft such as the Extra 300s, because small GA aircraft
and jetliners simply can't reach those accelerations without breaking up.

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