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Perhaps one of our MDs can answer this.  If you’re taking a series of shots after dark with a useable or an artificial horizon, is there any point closing your shooting eye while you use the night-light to read the arc with your other eye in an attempt to preserve night vision, or are both eyes interconnected?  I’ve tried closing one eye, and opening it while looking in the mirror, but everything happens too quickly to spot any iris movement.  DaveP