Thread: iron sights and bad eyesight

Hi there
I've a lever action with iron sights. There is provision for a Pic rail.
I wish to use the iron sights.
Heard about reflex dot thingies, scopes, peep etc.
I just want to use the standards sights. When walking/spotting I don't wear glasses.
Was thinking just a basic lens mounted to the screws for the rail. About 20mm.
Surely this has been done and they exist?
Any help appreciated.
Cheers me dears.