"Rolling ball" is an issue for about 5% of people, not really as common as people make it out to be. I was worried about it when I ordered my 10x50 ELs but never had any issues with them. They're just plain amazing, I won't use another binocular.
ELs make me nauseous... always have. So do contact lenses and certain flat screen televisions. The ophthalmologist explained that it had something to do with how my eyes/ brain interpret visual space. I had a hard time paying attention to him because I was busy throwing up in the bushes in front of his office after trying out set of contact lenses he recommended. Good thing he was a friend.
I see the rolling ball or globe effect. It is horrible if I pan, not so bad if I pick something out with the naked eye and bring the optics up.
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