I've been incredibly nearsighted since 2nd grade and there is no way anyone is coming near my eyes with anything that is not a 100% guarantee. I've only got the one pair of eyes, non-replaceable. I have these incredibly comfortable 30-day extended wear disposable lenses that are well worth the hassle if it means no damage. For those of you who know what it means, I wear -7.0 dioptra lenses. Us nearly blind folks can have comfortable eyes even when camping with no surgeons involved.