Re: prescription glasses with scopes?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 338ken</div><div class="ubbcode-body"> she said to try and look thru the center. The answer was very long and detailed and I do not not remmember exactly why, just sight thru the middle of lense instead of top left corner. </div></div>
That is because the lens is only correct at one place - the optical center. As you move away from the center, you introduce spherical distortion to the image. A plus power lens is two prisms base to base; a minus, two prisms tip to tip. Where they meet is where you want the light coming in to be correctly bent to reach the back of your eyeball. Now imagine what would happen to that light path as you move away from center, turn the prism pair on both their X and Y axes, then do all of this in an unpredictable fashion.
The only thing worse that not looking through the center is looking through different places randomly, which is normally what happens.
Not only are you not looking through the optical center, you usually have the lens tilted on both the X and Y axes, further compounding the problem, when using daily wear glasses for shooting. While with optics (as compared to irons) the effects are greatly minimized, anything you do that changes what your eye perceives of the transmitted image and changes it randomly will not help your shooting.
There's a reason why the international shooters use these contraptions: