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Old February 14, 2018, 06:32 PM   #8
Mike38
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Join Date: December 28, 2009
Location: North Central Illinois
Posts: 2,706
Closing one eye for repeated or extended periods causes the open eye pupil to dilate. The body does this naturally, trying to correct the vision. Then you get too much light into the one open eye. Open, close, open close, then the one eye that remains open gets blurry vision. Is this scientific? Not sure, but it happens to me. Personally, I can not shoot with both eyes open, as I see two targets. So, I put a piece of matte scotch tape on the lens of the glasses of the non aiming eye. I see one target with both eyes open, and don't get the dilation problems because light is still entering covered eye. Works for me!
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