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SESK: Stuff Everyone Should Know · sesk.info/sport-night-vision-30-minutes

How long in total darkness do the eyes need for complete dark adaptation?

At least 30 minutes.

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  1. 5 minutes
  2. 30 minutes ✔
  3. 2 hours

Why: Your eyes need at least 30 minutes in total darkness to fully adapt for night vision. A bright light can undo that adaptation quickly, so pilots protect their night vision.

Huh, didn't know that: Dark adaptation is also weakened by carbon monoxide, a lack of vitamin A and long exposure to bright sunlight.

The dad joke
Why did the pilot sit in the dark for half an hour? He was working on his night moves.
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References

Answer: 30 minutes. Your eyes need at least 30 minutes in total darkness to fully adapt for night vision. A bright light can undo that adaptation quickly, so pilots protect their night vision.

  1. FAA AIM 8-1-6 Vision in Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html
    exposure to total darkness for at least 30 minutes is required for complete dark adaptation.
    Checked 2026-10-10.
  2. FAA AIM 8-1-6 Vision in Flight www.faa.gov/air_traffic/publications/atpubs/aim_html/chap8_section_1.html
    Dark adaptation is impaired by exposure to cabin pressure altitudes above 5,000 feet, carbon monoxide inhaled in smoking and from exhaust fumes
    Checked 2026-10-10.

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