Should be used if the eye is shiny/is reminiscent of glitter.
Examples:
post #6220808
post #4341265
Two examples of a glowing eyes with eye_glitter:
post #6065632
post #5776818
Use this tag for posts like post #6215284, even when, looking at the eyes close up, the brush strokes in the eyes clearly look like brush strokes. From afar, they are still shiny and reminiscent of glitter.