I have single vision lenses (nearsightedness) that I use for umpiring. My "no-line" bifocals do distort enough that I do not want to wear them at least behind the plate, and I am lucky so far that I don't yet need them to read a lineup card.
I have also tried soft contact lenses recently (primarily so that I could use them for umpiring), but I apparently have a bit of an astigmatism that can not be corrected fully, and my vision was only close to 20/20, and worsened in lower light (twilight or night games). Plus, my farsightedness worsened with these.
I wore hard contact lenses for a long time, but had to give those up due to increasingly worse allergies. They worked great when clean, but, as mentioned by JJ, anytime any dust or anything got in them, it was like someone was poking a needle in your eye. Made calling balls and strikes a real challenge.
Laser surgery (or whatever comes along in the next year or so) may be the next thing that I try.
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