I'm having a hard time focusing on both sights & target
No kidding. Your eyes (anyone's eyes) cant focus on two things at once.
You have three things you "could" focus on. Target, front sight, and rear sight. You have to pick one.
Pick the front sight. The target and rear sight should be fuzzy. Front sight should be clear and sharp.
Just line up the front sight in the fuzy rear sight, put the clear front sight on the fuzzy dot (target) and let her rip.
A trick it to pretend the front sight is on a bar that is hooked to the trigger. As you pull the trigger you slide the front sight to the rear.
If you concentrate on this, it will look like you are actually sliding the front sight to the rear.
Now we all know the front sight cant slide back, but you get an optical illusion that it is.
What happens is you are concentrating on the front sight, making it look clear and sharp, looking bigger and closer.
The more you concentrate on the front sight the tighter your groups will be.
Also the exercise above has you concentrating on a smooth pull of the trigger trying to get the sight to move to the rear. You end up with the correct sight picture an a smooth trigger pull.
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Our sight goes south as we age, at 68 I'm right there with you.
I buy drug store reading glasses. I take a measurement from my eye to the front sight (rifle or pistol) and go to the drug store and buy a pair of reading glasses that allow me to see at that distance.
I can see a long ways but I cant see up close. In rifle shooting I use a score book or data book. I also play with the knobs on the rear sight to make corrections for wind or what ever.
My drug store glasses wont allow me to see the front sight and read the marks on my sights or write in my data book.
NO problem. I buy two sets of reading glasses. One to focus on the front sight, one to allow me to read, see the sights, or what ever. I get two of the same type glasses. I pop the left lens (Im right eye dominant) out and replace it with the left lens from the reading glasses.
Now I can use my right eye to concentrate on the front sight, and the left eye to see the marks on my rear sight or make notes in the data book.
Cpt. Edward Lewis states in his book "Military and Sporting Rifle Shooting" that there is no handicap that cant be overcome if one has a good coach.
In my nearly 40 years of coaching and marksmanship instruction I've found that to be true.
As I mentioned several times in the past, Gary Anderson said there are no hopeless shooters. I will add to that "there are problem coaches". We need to learn to adjust for a shooters perceived disabilities.