Dark Adaptation

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When you move from a really bright room into a darkened one, it takes a little while for you to see clearly. This is because certain muscle groups in your eyes need to be activated to allow your pupils to dilate. The bigger your pupils get, the more light your eyes can gather from your surroundings, and the more you can see. Many psychotropic drugs engage these muscle groups – that’s why your pupils dilate when you’re on them.

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