EDS-syndrome

Solartje

Solartje

the Brunswick BUG bit me
Silver Member
wanted to make a seperate post for it, to be sure i'm not hijacking the original question.

i posted some time ago problems that have been happening since some months, and after alot of tests, the conclusion was: that i have EDS-syndrome.

EDS-syndrom (own word :D ): Eye Dominance Shifting - problem.

in short: depending on where i focus (tip, cb, ob, pocket) my eye dominance changes or in real problem terms: i can see a 1/2 half ball hit left, a full ball hit or a 1/2 half ball hit right without moving a single mm, just by moving my focus from tip to pocket... Hard as HELL to aim consistent.

problem with solutions:-
- The only 100% solution is to either close one eye, but thats ALOT of work: aim, close an eye, move head so eye is above cue, aim, stand body still, open eyes and get normal position. TO much stuff for a preshotroutine and it gets me OUT of the zone...
- the 20% solution, focus as far as possible (the further the small the influence...)

now i found this in wikipedia:

"Ocular dominance, sometimes called eye dominance or eyedness or seeing through the eye [1], is the tendency to prefer visual input from one eye to the other[2]. It is somewhat analogous to the laterality of right or left handedness; however, the side of the dominant eye and the dominant hand do not always match[3]. This is due to the fact that both hemispheres control both eyes, but each one takes charge of a different half of the field of vision, and therefore a different half of both retinas. There is thus no direct analogy between "handedness" and "eyedness" as lateral phenomena.

Approximately two-thirds of the population is right-eye dominant[1][4][5]; however in a small portion of the population neither eye is dominant[citation needed]. Dominance does appear to change depending upon direction of gaze[2][6] due to image size changes on the retinas[7]. "

so i was right, im not going nuts !! now any expert or dokter can help me on how to keep the same dominance or 50/50 dominance for every focus?



it seems to be called MOTION PARALLAX !!
wikipedia link discribes me problem.


link to original post:link
 
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some interesting things i found:

York Centre for Vision Research, CIHR Group for Action and Perception, and Department of Psychology, York University, Toronto, Ont., Canada M3J1P3

In a reach-grasp task for targets within the binocular visual field, subjects switched between left and right eye dominance depending on horizontal gaze angle. On average, ocular dominance switched at gaze angles of only 15.5 degrees off center.

Vision Science Program, School of Optometry, University of California, Berkeley, CA 94720-2020, USA. marty@john.berkeley.edu

A recent paper examined eye dominance with the eyes in forward and eccentric gaze [Vision Res. 41 (2001) 1743]. When observers were looking to the left, the left eye tended to dominate and when they were looking to the right, the right eye tended to dominate. The authors attributed the switch in eye dominance to extra-retinal signals associated with horizontal eye position. However, when one looks at a near object on the left, the image in the left eye is larger than the one in the right eye, and when one looks to the right, the opposite occurs. Thus, relative image size could also trigger switches in eye dominance. We used a cue-conflict paradigm to determine whether eye position or relative image size is the determinant of eye-dominance switches with changes in gaze angle. When eye position and relative image size were varied independently, there was no consistent effect of eye position. Relative image size appears to be the sole determinant of the switch.

picture from wiki, imagine the star is the OB and the boxes are the pocket, then you will understand what my problem is!
 

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Actually, if you do some research on the subject, you'll find that EVERYONE does this. If you look to your left, your left eye will become dominant and if you look to the right, the right eye will do the same. In terms of hand-eye coordination where you have the opportunity to center yourself, your goal is simply to feel centered. Do not use your nose or chin as an aiming mechanism since you shouldn't need to be so rigid (though it may end up being that way anyway). You should simply place your head over the cue whereever you feel comfortable. You'll know when you have a sufficient view instinctually.
 
One thing you can try....

Instead of aiming at the pocket and object etc separately, just look at the object ball and use your peripheral vision to see the pocket and cisualize where the OB needs to go and on the backstroke look at the CB and on the forward stroke look at the OB and wiht your peripheral vision watch the line of the Cue stick as it flows forawrd toward the CB. This will give you an accurate line for the CB in your minds eye. It's a consistent way to develop feel and will not rely on eye dominance.
 
Jude Rosenstock said:
Actually, if you do some research on the subject, you'll find that EVERYONE does this. If you look to your left, your left eye will become dominant and if you look to the right, the right eye will do the same. In terms of hand-eye coordination where you have the opportunity to center yourself, your goal is simply to feel centered. Do not use your nose or chin as an aiming mechanism since you shouldn't need to be so rigid (though it may end up being that way anyway). You should simply place your head over the cue whereever you feel comfortable. You'll know when you have a sufficient view instinctually.
Click to expand...

jude, i have this when i focus on the cb to the ob to the pocket :) its not from left to right , its from close to far. its like i see 3 balls , one for each focuspoint :) i never had any problems for years, and sudenly i dont know wich one too choose :) ill try to do more research and experiment abit more with what has been posted here.
 
same problem

I have the same problem and once had it under control just by focusing on keeping one eye dominant. Like all things we practice it eventually becomes something we do without thought. Sit comfortably and place two objects in front of you, one at about twice the distance as the other. The objects should appear to be one on top of the other looking at them like looking at the top of multiple fence posts when looking straight down a fence.

With concentration you can force dominance on which eye you want to be dominant. If necessary cheat by covering the other eye for a few moments. Practice holding the dominance of your strong side eye as long as possible. Aids can include clear glasses with a piece of scotch tape over the weak side eye to blur the vision in that eye somewhat too. This is something you can practice during commercial breaks while watching TV or in your office if you work in one. The eye you wish to be dominant eventually takes over all of the time when you are looking straight ahead.

Not having a strong dominant eye with the eyes switching dominance is disastrous shooting pistol competition so there is no doubt when I have the problem or when my eyes are working to suit me. This simple exercise works and results will be seen in a few weeks if you practice diligently. I now want full binocular vision with both eyes working equally. That may be much trickier!

Hu
 
I have the same problem. I tried everything: closing one eye, tape to obliterate central vision in one eye, dominant eye over stick, ect.

Here is what helped me the most:

I put my cue stick on 1.125" blocks. Using a string line pulled snug, and positioned along the long axis of the stick, I aligned the pointing of the stick to the edge of an object ball a few feet away. Now I "knew" that the cue was pointing directly at a specific point on the OB.

I then put my head in different positions over the cue without touching it, looking for the head position where my perception of the aim corresponded with the true aim. I found that with virtually any deviation of the center of my chin off of the established aim line, the aim appeared incorrect. Even putting my dominant eye above the aim line appeared wrong.

I have since made a point of making sure my chin is dead center over the stick, and it has helped a lot. My guess is that different people have different optimal head positions, and I think the method described might help you find yours.

I also found that how high my chin was off the stick made little difference, provided I stayed dead center.
 
Dead Crab said:
I have the same problem. I tried everything: closing one eye, tape to obliterate central vision in one eye, dominant eye over stick, ect.

Here is what helped me the most:

I put my cue stick on 1.125" blocks. Using a string line pulled snug, and positioned along the long axis of the stick, I aligned the pointing of the stick to the edge of an object ball a few feet away. Now I "knew" that the cue was pointing directly at a specific point on the OB.

I then put my head in different positions over the cue without touching it, looking for the head position where my perception of the aim corresponded with the true aim. I found that with virtually any deviation of the center of my chin off of the established aim line, the aim appeared incorrect. Even putting my dominant eye above the aim line appeared wrong.

I have since made a point of making sure my chin is dead center over the stick, and it has helped a lot. My guess is that different people have different optimal head positions, and I think the method described might help you find yours.

I also found that how high my chin was off the stick made little difference, provided I stayed dead center.
Click to expand...

I did a similar thing by clamping a small laser to the top of my cue. About 18" back from the tip on the top of the shaft. It was a little awkward but I learned a little from the effort.
 
helpfull information!

i knew i could force a specific eye dominance but it took me to long and got me out of my rhytme when i did it when i was down. (im a single stroke player when in the zone).

i'll try to train eye dominance and hope it will become naturally.

ps do you have any idea on how long it tooks +- before the eye dominance forcing becomes natural?

ps2; is there a way to train both equal eye dominance? ive played with a centered on the chin cue for 10 years... i would hate to change my stance to a cue under dominant eye...

Keep thinking about this while you shoot it will help..........

ps: you are right that thinking about this WHILE you play is the worst nightmare. i AMEN that!! i had some HORRIBLE times in the last months, but at least it explains why i was missing straight in shots. if i can become more consistent then its worth thinking about eye dominance changes !!.

like everything, you always have to take one step back to go two forward.

ignorance wont lead to improvement.
 
Just comments

First, if you have the 'proper' form, your chin just naturally ends up directly over the cue (45 degrees to the cue, straight lines on form, bend at waist, not the back, 60% weight on back leg which is locked, 40% on front leg which is slightly bent and turned forward some)

and something you didn't consider on aiming is that astigmatism plays a role in aiming true. If astigmatism is not corrected properly, where you see to make the ball will not be where the cue goes, generally a 1/4 to 1/2" off.

I just went to the Eye Doctor 2 days ago, and these relatively new soft lenses with astigmatism correction have lessoned my astigmatism, it has actually gotten better, and for the first time in my life, both of the lenses he put on me were exactly the same all the way around, which is a big deal for me, since I am the epitomy of eye problems.
 
time table

I'm sure that the time will vary but I started benefiting in just a few days and in maybe two weeks it was a done deal. I can close either eye with no problem so by lining up the two balls and then closing the weak eye or strong eye they either remain in alignment or jump out of alignment making it very easy to see if the eye you want to be dominant is really dominant. I was able to practice many times a day over the course of a full day and did this daily until I was satisfied.

Scott Lee just mentioned that he has some exercises to improve binocular vision I believe. That I would like to know about myself. For shooting pool I believe full binocular vision with both eyes equal would be an advantage. I have to admit that I don't know how to get there. In theory I guess carefully lining up your position and the position of two objects like I mentioned earlier and working towards the objects moving the same distance out of line either way when you closed alternate eyes might work. I haven't tried this however so I can't vouch for it working.

Hu

Solartje said:
helpfull information!

i knew i could force a specific eye dominance but it took me to long and got me out of my rhytme when i did it when i was down. (im a single stroke player when in the zone).

i'll try to train eye dominance and hope it will become naturally.

ps do you have any idea on how long it tooks +- before the eye dominance forcing becomes natural?

ps2; is there a way to train both equal eye dominance? ive played with a centered on the chin cue for 10 years... i would hate to change my stance to a cue under dominant eye...

Keep thinking about this while you shoot it will help..........

ps: you are right that thinking about this WHILE you play is the worst nightmare. i AMEN that!! i had some HORRIBLE times in the last months, but at least it explains why i was missing straight in shots. if i can become more consistent then its worth thinking about eye dominance changes !!.

like everything, you always have to take one step back to go two forward.

ignorance wont lead to improvement.
Click to expand...
 
Quit looking all over the room while you're shooting.
 
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Solartje said:
jude, i have this when i focus on the cb to the ob to the pocket :) its not from left to right , its from close to far. its like i see 3 balls , one for each focuspoint :) i never had any problems for years, and sudenly i dont know wich one too choose :) ill try to do more research and experiment abit more with what has been posted here.
Click to expand...

If you're seeing more than one image, you should see an eye doctor immediately. This would be more serious than just a pool problem.
 
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