When the sclera - the white part of the eye - is a color other than white.
The following tags implicate this tag: aqua_sclera, black_sclera, blue_sclera, brown_sclera, green_sclera, grey_sclera, orange_sclera, pink_sclera, purple_sclera, red_sclera, and yellow_sclera (learn more).
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