Ketsuryūgan, Narutopedia

The Ketsuryūgan (血龍眼, literally meaning: Blood Dragon Eye), is a dōjutsu, which appears in certain individuals of the Chinoike clan. The Ketsuryūgan is recognised by its reddish colour, giving a special appearance for the users of this dōjutsu, characterised as holders of "eyes as red as blood". Its power earned it comparison to the Three Great Dōjutsu. Upon activating, the Ketsuryūgan makes the user's eyes glow bright red sclera, dark red irises, and white pupils shaped as horizontal rectangles

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