not because they expect trouble, but because the cost of being unprepared is measured in seconds.
Your eyes are slow to adjust
The core reason for dimming the lights has nothing to do with the plane and everything to do with you. The human eye does not switch instantly between bright and dark. When you walk from a sunlit street into a dark cinema, there is a stretch of helpless blindness before shapes resolve. That process is called dark adaptation, and the slow part of it can take many minutes
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