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I'd say, how often would you find it acceptable to have this correction done? IF it is possible more then once.
I was shortsighted for most of my life. In the last few years that has gone and I'm long sighted - 20/20 on my MSA medical - but need reading glasses. I'm sure I'll need stronger ones again soon. The thousands for laser correction would pay for many, many pairs of specs.
The original questioner found that misting and wearing glasses inside a helmet were difficulties. If he found a sympathetic optician, I'm sure they could find a spectacle style that was more robust (memory metal?) and would suggest a suitable antimisting agent. They have to deal with other professional problems, for instance airline pilots who need bifocals need a reading segment above as well as below, to read the overhead gauges.
John
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