I think it's really interesting how when we learn new things (such as this lesson about how the eye works) we often only learn them "halfway." E.g., obviously, you're not blind, and you see as far as you like- but your old sense of how sight works involved contact, and your new concept didn't fully rid you of the notion that contact was a limiting factor. Only because these two contradictory notions could coexist in your mind did you feel "blind."

Similarly, I've had people tell me that reading about the "microbiome" is really distressing, since afterwards they feel like they have some alien infestation in their bodies- as though they were full of bugs. On one level they learned a new thing, that healthy human bodies contain lots of various microorganisms, but some part of their psyche still maintained that any such creatures must be pathological. Their obvious health doesn't make them feel like microbiome theory is false, and nor does it fully convince them that their microbiome is benign.

There's probably a lot of more subtle examples of this, and it probably goes a long way to explain why so many people find science to be distressing or depressing.