shooting glasses (Basic question- covering one eye?)

Original question
---------- Forwarded message ----------
From: tim copley 
Date: Oct 18, 2006 8:33 AM
Subject: Re: [Bullseye-L] Shooting Glasses - More basic question

So actually let me ask a more basic question.  I'm still pretty new 
to shooting.
I have been typically shooting and closing my left eye while I 
shoot.  Joe and Pete at Phoenix rod and gun have suggested that I 
put something over my left eye (tape on the glasses or something 
that clips onto the left eye piece for my shooting.)

Is this just for my eye's benefit or will doing this help my shooting?
I've been on this list for a couple months, and have read the e-mails of Dr. Wong.
That he has sent recently.  However I guess I'm still a bit confused as 
to the benefit of keeping my non-dominate eye open during my firing?  
The ones I've read surrounded his veiws on optics and focal point in 
relation to sights.  I wear contacts and corrected my vision is  good.

Thanks in advance for any advice.  I'm learning more about this 
sport every day!


Follow up comments to my original question
---------- Forwarded message ----------
From: tim copley 
Date: Oct 18, 2006 10:33 AM
Subject: Re: [Bullseye-L] Shooting Glasses - More basic question

Also, I forgot to mention.  I most certainly am going to listen to this
advice, and will try out some different methods of doing covering my eye.  I
guess I was just a little curious why I'm doing this :)  We where in the
middle of the NMC of a 900. and they didn't have time to give a good

Or if they answer is RTFM.  I'm good with that too if somebody can point me
to the FM :)


Response from David H. Daniels
On 10/18/06, David H. Daniels  wrote:
> Tim, I can only comment for myself.  First of all, I am right handed 
> but left eye dominant.
> Second, from someone's post years ago on this forum, I learned that it 
> is NOT GOOD to close one eye as that places tension on the other eye.
> Third, also from this forum, was the recommendation that I keep BOTH 
> eyes open (some suggested both eyes shut!) which I now do.  I find 
> that my dominant eye is the one that "sees" the red dot.  NOTE:  I use 
> no prescription for shooting with a red dot.  I do use eyeglasses for 
> driving and a separate pair for reading and computer work.  This 
> second pair has been used for iron sights but that is slowly 
> degrading.
> The difficult thing to master, IMHO, is to focus on the dot.  Not the 
> target, the dot.  The target can be a fuzzy black ball upon which the 
> dot rests upon and you can shoot tens and Xs.  Focus on the target and 
> you will shoot 6s and misses.
> Finally, when all of this is done is the problem or challenge of 
> releasing the trigger for the perfect shot.  Please avail yourself of 
> the archives for more detail.  I am still learning.
> dd in MA

Response from Bryan Coyle
>On 10/18/06, Bryan W. Coyle  wrote:
> You'll have to try it a couple of times to get used to it but it
> really does help...not black, just translucent.  Keeping one eye shut
> does cause 2 issues...imbalance in the muscle tension tugs on the
> open eye, you'll notice less rapid fatigue with the occluder and, if
> the non-shooting eye is completely blacked out (occluder that's
> black, eyepatch, squeezing it shut), then the open iris will
> over-compensate and open wider - especially with irons, it throws off
> your point of focus.
> Gil Hebard and perhaps Champions Choice sell the occluders - $6 or
> so; I also use a single layer of light masking tape on a pair of
> glasses whose rims are too thick to hold the occluder.
> /Bryan

Response from John Mcguire 	
	 I also am right handed and left eye dominant. There are two main
reasons for covering your dominant eye instead of closing it. First off it
gets very tiring to hold it closed during a full 2700. The last thing you
want is to have anything be distracting to concentrating on your shooting.
As you get tired of closing it it starts to flutter or quiver and that is
very distracting. Secondly if one eye is closed especially your dominant
one, both eyes will dilate the pupil because of the darkness your eye sees
when closed. This will cut down your depth of field and make and keep
changing it as the pupil dilates. Again this gets wearying after a while and
the dot or your front sight will go in and out of focus, which makes it hard
to concentrate on your sight picture. You tend to concentrate on focusing on
the dot not on your shooting. I use a flip down occluder I wear on the bill
of my cap when I shoot. It sits around the middle of the bill so when I am
standing at an angle to the target and turn my head to sight it in it is in
front of my right left eye and my right is aimed down the barrel. When not
shooting and scoring targets it is not in the way because it is in the
middle and your eyes see around it. When there is an extended lull or
between matches I can just flip it up out of the way altogether to talk to
other people. For an occluder I just made my own, but there are a few
available. I would choose a  transparent one over an opaque one. Check
Champions Choice. I don't advise the tape on the glasses because it gets in
the way when scoring targets. You loose all depth perception and that makes
it tough. I forgot my occluder once for a 2700 so I know first hand that
closing your eye makes it hard to shoot. I shot OK but certainly did not do
my best. If I were new at the time it would have been a lot more difficult.
Hope this helps.


Response from Ron Hawkins 	
			 What I've been told and makes sense that keeping
your non dominant eye closed  will tire the muscles in the eye area
especially in longer matches 2700's etc.

I use a black occluder and keep both open. Some say use a lighter colored
occluder but haven't tried that yet.

Good luck.


Response from Larry Mennetti
larry mennetti 	 to me

Cover the non shooting eye with a translucent cover--such as the plactic
milk jugs are made from. Kinda like a clear plastic with a foggy finish. You
want the same amount of light entering both eyes so they balance. It messes
your brain up otherwise and then the brain messes with the size of the pupil
of the eye. This causes focus and eye strain problems. Don't use a black or
white cover. You need something light will pass through ,but that you can't
see thru. Some people use the foggy colored scotch tape on their glasses but
, I prefer the plastic.

Larry M---Michigan

Response from Joseph E. Giannetti

I would try putting an obscure cover of your non dominate eye, it allows you
to focus better at the dot and relieves the strain on your dominate eye like
everyone has been telling you.


Response from Bob Fleming
Bob Fleming 	
 to me, carlos, bullseye-l
HI Tim,
		 If the non-dominate eye is closed or covered completely
then the pupil of
the shooting eye will dilate slightly. This is bad because we want the
greater depth of focus to see the dot better. Most dots are not exactly in
focus at infinity and I find that I need -0.25 diopter added to my normal
distance prescription to see the dot the best.
Another problem is balance. You are not in danger of falling down at the
line because one eye is covered but balance is more stable when we receive
visual cues about our surroundings. The difference in steadiness is small
but every little bit helps.
I prefer a flip up blinder that looks like a piece of plastic milk jug. It
lets in plenty of light but I can't really see the target. I cut it into a
narrow strip so I can block out only the target. I use no blinder at all for
fast shooting like plates and bowling pins but I find that the view of the
target from the off eye is distracting during deliberate shooting like BE.
Bob Fleming