I am now pushing the big 6-0 and I've had astigmatizim since I was in the 4th grade. You know back in the days of the one class room caves. I also am nearsighted. I've had progressives and could never get used to them so I went to regular bifocals. Smaller lensed glasses make bifocals work funny as well because you are trying to pack too much into too small of bag if you get my drift. I have special glasses made up for computer use and I would suppose now that they would also have worked well when I was still welding. I actually considered having a pair made with the bifocal on the top of the lense because trying to see through tyhe bifocal on the bottom while trying to weld over is literally a pain in the neck. I also have a pair made without the bifocal for just distance. Bifocals and golf swings also have compatability issues. On a final note I was shooting my bow and noticed with one pair of glasses the target was just blurry with one pair of glasses but clear with another. I asked my eye doctor during my next exam and she checked both pair and they were both within tolerences for my prescription. one being on the high end and the other being on the low end. The high end was better for long distance than the low end. Talk to your eye doctor.