As my eyesight has diminished, I find the higher power helps, but, I really prefer a variable so I can match the reticle to the aiming point, if that makes sense. Also helpful (to me) is using a square paster or aiming point and framing one of the lower corners with the crosshairs for a more precise aiming point than I can get w/center hold.
The variable power is even more important when using a center hold.
With macular degeneration, I am finding a ghost cross hair (especially the horizontal) now that sure opens up groups and unfortunately there doesn't seem to be a remedy for that. Sometimes it helps to cock head so that I am looking at the reticle out of the corner of my eye, but sure hard to get exact spot weld that way.
Oh well, just gotta let 'em get closer or pick bigger targets; its all good!
