Tilting head up ...is going to cause you neck problems ( especially at your age..and lack of physical conditioning )....
... ( yes I know the OP, and he knows its true !! ).
Call DeCot and get a set of lenses made for your handguns...( don't be so cheap ..)...
( again, I know him -- and he knows its true )...
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Ok, there is value, if you are going to carry for Defense...to shoot with your street glasses...and get used to the sight picture with your "street progressive bifoculs"...and all the guys under 30 on here "are rolling in the aisles and laughing" at us old guys...
but in my view...Defense..is for between 3 Feet and probably 24 Feet ..and if you need a gun someday, and I hope not !! ...and you're shooting at an "averaged sized Buffalo like me" you'll be fine if you focus on center chest hits.
However, if you're trying to wear out a 3" circle at 8 yds, or 10 yds..or 15 yds...call DeCot.../ one lense will be made for distance so you can see the target ...and one lense, dominant side, will be made for focul length of your front sight... / you'll have more fun in your training..and learn better fundamentals if you can see the front sight clearer ! ...and nothing is free...
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and for you guys that still think I'm picking on him ...well, you're right...but he had to know it was coming ...
and yes, go see a good Opthamologist...and get those eyes checked...( and I have my flame retardant bicycle shorts on, waiting for your comeback )!!