This tag refers to situations where the eyes aren't given the customary glint or light spots, or are colored with a solid dull flat shading. This usually indicates the bearer is either expressing a vacant stare, or is unconscious or otherwise "not all there" at the moment. This technique, in its most extreme form, can be used to indicate:
In the context of Kemono Friends, this usually denotes an extinct Friend (an animal-girl of an extinct animal).
This tag is not used for when the irises and pupils are missing entirely. For that, see blank eyes.