[Drew Hause]

re: Gil Ash, these statements are factually in error
Center Vision and Weak Eye Dominance
When you close an eye you do lose depth perception but more importantly your perceived lead will double or even triple.
A two eyed lead is as much as half or more LESS than a one eyed lead.
When we take shooters from one eyed to two once they understand the sight picture and can replicate it we tell them to cut their lead in half and they are instantly successful!!
The targets seem 1/3 smaller and 35% faster with one eye than with two eyes.
Dominance shifts are most often caused by shooters trying to be perfect in the set up by double checking the muzzle placement in the hold point.


Binocular summation refers to the improved visual performance of binocular vision compared to that of monocular vision.
Improvement has been well established in brightness perception, flicker perception, contrast sensitivity, peripheral visual field, response time, and visual acuity - by about 11%
Some people may perceive a difference in size and speed of a moving object two vs. one eye; but like visual acuity from binocular summation, the difference is no more than about 10%.

 

[Drew Hause]

Frank: your options seem so easy, but what if Option 2 isn't working for a 60 year old man who has enjoyed shooting much of his adult life and suddenly can't hit a target because he has shifted dominance? Try harder? Give up and play golf?
An interesting poll
Poll: Corrective measures that have resolved my...

I believe those interested in the complicated issues of visual processing are genuinely trying to help.
Phil Kiner, Peter Blakeley and Ed Solomons would be examples
Worried about closing an eye? Don’t be 😉 | Shotgun Forum (shotgunworld.com)

 

[Drew Hause]

Frank: absent marked disparity in acuity "The eye with the clearest image will be dominant" is incorrect.

I've discussed this issue with an optometrist who teaches neuro-ophthalmology down the street at Midwestern U. and when asked why we dominance shift his learned answer was "We just do, and you won't understand why."

 

[Drew Hause]

Frank: it has also been established that dominance testing and visual processing assessments in the office may not correlate well with moving targets in the field or baseballs in the outfield.

 

[Drew Hause]

The extremely short version of dominance and dominance shifting is that the dominant eye is not necessarily the eye with the best visual acuity, but the one with the "best" visual processing, and that is where Jim's analysis is helpful.

And this is very likely the issue with women who are much more likely to need some form of off-eye occlusive but who on formal testing are actually not much more cross-dominant than men.

Visual evoked potentials have shown that dominance is related to the difference in latency (speed of the impulse to the visual cortex) and amplitude (amount of impulse).
http://iosrjournals.org/iosr-jdms/papers/Vol2-issue4/D0241924.pdf

The problem is that "dominance" doesn't really capture all that is going on with binocular vision: there are LOTS of visual processing issues - binocular rivalry, rivalry dominance, stereopsis, motion perception threshold, and lots more that I don't understand
Finding the "Master Eye"
And IMHO it would be helpful to "focus" (pun intended) on the larger issue of visual processing rather than simply dominance, dominance shifting, and "cross-firing" - which are all processing issues.

 

[Drew Hause]

Unfortunately for some Fox, the Orbicularis oculi (the muscle that shuts the eye) is bilaterally innervated by branches of the facial nerve (cranial nerve VII) so many of us can not close one eye without involuntarily squinting the other eye, with significant distortion of the vision.

 

[Drew Hause]

Notch: happy to share, but my experience most certainly may not reflect the experience of others.
Part of my problem was that my dominance could shift several times in one round of skeet or trap, but esp. with L to R targets. And I clearly see 2 golfers rather than the one on the tee outside our fence about 30 yards away.
Blinking my L (off) eye distorted by R eye vision.
A "bead blocker" just attracted by L eye. No (Ralph) I was not "bead checking".
A tiny occlusive dot exactly in front of my pupil worked at first

but then didn't, and trying larger dots or total occlusion attracted by L eye to the point that all I could "see" was the back of the occlusive If I shut my L eye and stared intensely at something with my R I could shift dominance back.

After 3 frustrating years of this, I now shoot both eyes open again, and somehow have subconsciously adjusted the leads when shooting low gun recreational skeet.
Trap is still a mess (as in 5-5-1arghhh!!-4-4), but with my hopeless flinch and previous TBIs I've mostly given up.

 

[Drew Hause]

Didn't work either