This Is the Reason Planes Dim the Cabin Lights During Takeoff and Landing
Briefly

Prior to takeoff, pilots follow several detailed checklists to ensure safety and efficiency. One common practice that affects passengers is the dimming of cabin lights during takeoff and landing, which is primarily for safety rather than comfort. Experts explain that dimming lights allows passengers' eyes to adapt to darker conditions outside the aircraft quickly, enabling them to evacuate in an emergency more effectively. This is crucial during takeoff and landing, which are known to be the most critical phases of flight.
Dimming cabin lights during takeoff and landing prepares passengers' eyes for darkness, ensuring safety and quick adjustment in case of an emergency.
According to Paula S. Adams, dimming lights is primarily about passenger safety during critical flight phases where incidents are most likely to occur.
Read at Travel + Leisure
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