General rule, if the 3D either A doesn't work or B hurts/makes you sick, you have an eye problem, it's actually an easy way to test if you've got an eye problem.  

Working at a place that specializes in 3D and having to give explanations when a person comes up to me and complains the 3D is making them sick, I have to inform them to either put their glasses on, if they don't have glasses I can refund their money but they have an eye problem they probably need to get checked out.  

I showed a friend the 3DS he had an issue with the 3D cause he wasn't wearing his glasses/contacts that day, he knew that was the reason but still I toned down the 3D for him and let him check out ridge racer 3D, he then really wanted to buy one after seeing a racing game in 3D.

As for the pole I litterally never turn my slider off max, it helps that I have perfect vision though.

use the slider, low setting has no reason to hurt your eyes.

Usually max.  Haven't found a need to tone it down any yet.

Mine has permenantly been on max

I have it always on max (except for AR games), because it doesn't cause me problems and the picture looks much smoother to me that way.

So, that means those that are near sighted but refused to put glasses on have problem with 3D viewing?

Instead of the usual double images from near sightedness. Now you get quaduple images with the addition of 3D effects?

My left eye is still twitching from that one time that I tried out Pilotwings.

Have mine set fairly low...a third to a half of the way seems to be enough for me.

I like the option to switch it off cos sometimes enough is enough. Went to see a 3d movie last night and a bout 20 mins in I was just wishing I could turn the 3d off!!!

yes,usually about 2/3 of the way on max. Can't wait until more games come out for the system.

Always, on the highest setting too. Switching to 2D just seems weird to me now.