How To Find Your Eye Alignment

There is a little test you can do to check if you have the right cue alignment and to find your personal cue alignment. First you have to do the dominant eye test:

Now don't just put the cue under your dominant eye. Instead we are doing the following:

Set up the shot from the screenshot. Use the one ball if you're right eye dominant and use the two ball if you're left eye dominant. If you have no dominant eye at all, you can use both shots.

Put your cue (or your head) so that your non dominant eye is exactly over the cue. Make sure that you put no spin on the cueball and stroke the ball very clean and straight, and to the point that you aimed to. You should now hit the ball way to thick into the long rail (undercut).

After you confirmed that outcome with a few shots, move your cue a little more towards your dominant eye and repeat. At some stage the cue is exactly under your chin, until it's exactly under your dominant eye or even further.   

What usally should happen is, that you will hit the object ball better until you reach your perfect eye alignment, and then if you go to far you hit the object ball to thin (overcut).  Remember the position where you made the ball (several times).

But definetly make sure that you over- or undercut the balls caused by your eye alignment and not because of unintentional english on the ball, wrong aiming point, choking, no straight stroke, ...)

Confirm this with different balls, and there you have it - your perfect eye alignment.