[khedoros1]

Do your glasses get so dirty that it's visible in a webcam image before you clean them yourself? In typical lighting conditions, I don't think my lenses' smudges are visible until well above the threshold where I'd clean them myself.

[amichail]

Then improve the hardware so it can detect these smudges.

[JohnFen]

But why? It's easy to tell when you need to clean your glasses without special equipment. Unless I'm missing something, there doesn't seem to be a problem to be solved here.