Something I've learned from an expert birdwatcher

[Wallabing]

When you look through a single objective optic, such as a spotting scope or a rifle scope...if you squint/close your other eye when viewing through, the blood pressure in your eyes changes, and the perception of focus in your dominant eye changes around, swinging around +/- , causing your brain to fight the image back and forth, causing eyestrain and uncomfortability, headaches.

He said you should always keep both your eyes open when looking through spotting scopes or rifle optics as much as possible.

[baba booey]

🤔

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[Hooligan]

That sound fancy, I found it more comfortable to shoot with both eyes open. Riflescopes with big dials on the left side really throw me off though.

I recall one of my first range trips I squinted the whole time. Just like they do on TV you know. At the end of the session my face hurt. After that I trained myself to keep both eyes open, for pistol, rifle open sights and scopes.

[k1dude]

Many precision shooters will simply place a Post-It Note on the closed eye side of their eye pro - but keep both eyes open. You get the benefit of no eye strain while only using one eye.

[nedro]

Many precision shooters will simply place a Post-It Note on the closed eye side of their eye pro - but keep both eyes open. You get the benefit of no eye strain while only using one eye.

Good idea!
Thanks.

[lairdb]

Good idea!
Thanks.

Using a Post-It may cause a pupillary response, and the un-obscured pupil will partially react as well. A small square of Scotch tape on your safety glasses, or a portion of a milk jug clipped on, or something similar will still allow the ambient light through, while obscuring the vision of the eye.