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  • ...but what a "lens" is and how it functions requires already a theory which explains it, and then you'd need to believe at least to some extend that what you describe is "real". Commented Jun 16 at 6:46
  • @JasonFunderberker which is why I am a physics guy and not a philosopher! Commented Jun 16 at 17:40
  • Right but this has the issue that the lens in our eyes is part of the perception which gives us the foundation of our knowledge. You could say that a microscope gives an extra level of indirectness which would make the bacteria an unobservable
    – edelex
    Commented Jun 17 at 16:59
  • As a philosopher, you are richly entitled to say anything you want ;-) Commented Jun 17 at 17:13
  • @edelex And if you have an artificial lens in your eye, e.g. due to cataract, has the whole world become unobservable to you, although you can actually see it better than with your natural lens?
    – Igor F.
    Commented Jun 17 at 17:51