Valley of the Silk Sky: The Long Run - page 82
So yes, regular glasses basically look like sunglasses in infrared, and therefore people who wear glasses are, to the Daraz, like someone who wears sunglasses indoors.

The Daraz have a hard enough time reading human facial expressions as it is. The high-contrast markings on the Daraz are actually different types of skin that transmit heat differently, so they show up in IR. Human skin lacks that kind of variation, so the Daraz have to rely on eye and mouth shape to guess at a human's overall expression.


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