Modelling glasses

Last week, I spent quite a bit of time at the workbench for a magazine project. It made me realise just how often I change my glasses.

I have three pairs:

• Normal everyday ones. 
• "Reading" glasses for closeup work. It distresses me slightly to realise how often I need to wear these as I get older. 
• An old pair to wear when spray painting. Any floating vapour can sit on their plastic lenses where if it etches the surface, I'm not so worried. If I bend them taking the mask on and off (yes, I know, take the glasses off first you idiot) then it's not the end of the world either. 

Is this normal? Plenty of people have reading glasses I suppose but does anyone else have a selection for other purposes? What about model engioneering types driving small steam locomotive and getting faces full of soot?