Try This...

[siouxbrew]

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it called visual purple or rhodopsin, takes about 30 minutes to fully adapt to full performance, i am not a nerd i know this because i am a pilot and it is required material for me, for instance if i am driving to the airport during nighttime for a flight, i will close one eye if an oncoming vehicle is coming at me in order to maintain my night vision. and i believe it was the main reason pirates wore eye patches

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same procedure in military to maintain night vision.

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yea and the phenomenon is really not that cool