Aeromedical factorsQuestion 718 of 934

At what cabin pressure altitude can night vision start to get worse?

  1. As low as 8,000 feet
  2. As low as 12,000 feet
  3. As low as 5,000 feet
  4. Only above 15,000 feet
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Correct answer: As low as 5,000 feet

Night vision gets worse at cabin pressure altitudes as low as 5,000 feet.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 8-1-2 Effects of Altitude, page 641

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Questions last reviewed: 18 October 2026