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[–] octobersky [S] 0 points 1 point (+1|-0) ago 

"There are multiple cues indicating the presence of a transparent layer... Even in the absence of such visual cues, the human visual system is often able to determine the presence of a transparent layer, suggesting that humans are also sensitive to alternative cues."

This is phenomenal research, in my opinion. The more we find out, the more that can be done to mimic the human eye with artificial optics.