How can u Tell if u have misalined bins.
Do you mean "out of collimation?"
For this problem select as your target a telephone pole about 100 feet away. Make sure the binocular is focused on it. Take the binocular away from your eyes for a minute of so and then quickly bring it up to your eyes and look at the pole. If you see 2 poles, no matter how briefly, you have a collimation problem. Your brain will try to make it look like 1 pole and this might happen if it is not badly out of collimation but the less it is out of collimation the more likely you are to get eye strain if you keep using it.
Bob
The extraocular muscles are designed to provide z-axis parallelism for the optical axises
1) when looking straight forward towards infinity
2) when looking either to the right or to the left (x-axis) but towards infinity
3) when looking either upwards or downwards (y-axis) but towards infinity
4) combination of x-axis and y-axis gaze still towards infinity.
Furthermore, they are designed to provide convergence when gazing towards a closer object. The convergence is usually easiest to perform if the object is located right in front of the eye pair and, for most people, preferably down the y-axis (downwards).
But the EOM are not designed to provide individual y-axis movements, where they would not be able to maintain visual fusion/stereoscopic vision.
Only very small height adjustments can be performed in order to ensure fusion.
Most people are not able to diverge with the eyes as it always will cause diplopia
As a result, the brain will react quite harshly if diplopia occurs as a result from:
1) Innervation to superior rectus or inferior rectus lost in one eye or muscle is damaged by trauma
2) Spectacles are misadjusted and resting obliquely in front of the eyes
3) Binoculars are out of collimation in this specific direction
So, to get to the point, if a slight misalignment forces the eyeballs to converge a little, not much happens because the ability to converge is physiologically inherent to the human body.
Some people will not notice a misalignment that demands a divergence of the pair of eyes. On the contrary, the binoculars may feel extraordinary comfortable to them!
Both of these x-axis misalignments will change slightly to the better from an IPD adjustment.
One can be pretty sure that a height deviation of the barrels (y-axis misalignment) will cause severe eye strain and diplopia either while looking through them or after doing so.
As for myself, I'm in the fortunate position of being able to diverge voluntarily to enforce diplopia, and when I do that while looking through binoculars, I will immediately observe if they have a height misalignment.