Eyes that are missing both the irises and pupils; only the sclera are present. This could be either part of the character's design, or due to unconsciousness or extreme shock (see o_o/0_0).
Related tags
Empty eyes (pupil, iris, and sclera all present; flat iris color and no highlights)
Blank eyes (pupil and iris missing, sclera clearly present)
Solid eyes (pupil and iris missing, sclera is color other than white)
Hollow eyes (pupil, iris, and sclera missing; empty holes for eyes)
o_o / 0_0 - eyes forming solid white circles / ovals with a black rim.
