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    Re: Is night vision independent?
    From: Tom Sult
    Date: 2015 Nov 08, 14:44 -0600
    There is interconnection. But the issue with night or dark adaptation has less to do with the iris as that will accommodate rather quickly. It is the retina. Using a red light will preserve night vision. 

    Tom Sult, MD
    Author: JUST BE WELL

    On Nov 8, 2015, at 14:02, David Pike <NoReply_DavidPike@fer3.com> wrote:

    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

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