Hi Everyone,
I bought a Gehman 500 iris with an air rifle a while back, which included a clip in lens, which is one of these -> 500-Filter.jpg but clear glass. I believe it could be for the previous owners astigmatism.
I don't know anything about shooting glasses, let alone astigmatism, nor how much one originally cost (thus I don't know what to ask)
Its just collecting dust at the moment, so i'm happy to part with it.