heterochromia

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Images or animations depicting a character with the medical condition known as complete heterochromia iridis, a genetic quirk which causes their eyes to be separate colors.

This includes characters with asymmetrically colored eyes, e.g. a green eye and a blue eye, or a notably lighter or deeper shade of a single color.

Note that for simplicity's sake, if a pre-existing character is known to have heterochromia, but it is not apparent in an image (if they're turned to the side or have one eye closed, for example, or if the image is in black-and-white), that particular image should not be tagged with "heterochromia".

For the condition where a character has multiple colors in the same eye (or sectoral heterochromia idris), see multicolored_eyes.