Work well - these clip on Polaroids have the thumbs up from my wife, and she’s not easy to please. they fit over her specsaver prescription glasses with no issues. they are certainly a much better, and cheaper Option than a pair of prescription Polaroids. I took a look through them and found them right up there with my glass lens spotters, well not quite as good, but that’s to be expected. Yes the case is minimal, but usable with care, for $16 its fine. The colour is good for fish spotting, wife spotted some before me.