An Eye Colour Change is when a character's eyes change colour in response to some stimuli. The colour the eyes change into depends on the event and the character, but it can be anything from a shift in hue to something as dramatic as brown eyes turning bright yellow and round pupils lengthening into slits.

This is generally a sign that something major has just happened. A possession, a shift in alignment, the acquisition of supernatural power, trauma, anything significant can trigger an Eye Colour Change.

Supertrope to KaleidoscopeEyes which is about eyes working as mood rings. Does not apply to a AdaptationDyeJob. See also ConvenientColorChange, GameFace, EyeLightsOut and DemonicPossession. A frequent feature of MindControlEyes.
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!Examples

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[[folder:Anime and Manga]]
* ''Manga/{{Claymore}}'': The eyes of a Claymore are silver until they use their Yoma powers; this turns their eyes gold.
* The title character of ''Manga/RurouniKenshin'' changes eye colour to correspond to which SplitPersonality is in command in the anime.
* Subaru Nakajima's eyes in ''Anime/MagicalGirlLyricalNanohaStrikerS'' are normally green, but turn gold when she [[spoiler:enters full Combat Cyborg mode]]. The first time this is triggered on screen, it also coincides with UnstoppableRage.
* ''Anime/DragonBallZ'': A Saiyan's eyes turn greenish-blue when he turns Super Saiyan (although it's easily missable, since [[PowerDyesYourHair the other effect]] of the transformation is much more visible).
** Their irises also turn red when they start absorbing Bruitz[[note]]Blutz in the dub because the translator wasn't paying attention to context[[/note]] Waves when they look at a full moon, as a leadup to the transformation to a Great Ape.
* In ''Anime/{{Naruto}}'', The Sharingan is a hereditary superpower of the Uchiha clan that allows for AwesomenessByAnalysis and causes distinctive change in the eye when used; a more advanced version exists has a different look. Both are unlocked by [[TraumaticSuperpowerAwakening traumatic experiences]].
* In ''Anime/TengenToppaGurrenLagann'', humans who channel enormous Spiral Power have spirals appear in their eyes. This is seen mostly in Lordgenome, but also briefly in Kittan [[spoiler:right before his death]]. Simon's eye also changes during [[spoiler:the Giga Drill Break war with the Anti-Spiral after Lordgenome's sacrifice]], as well as during [[spoiler:the DistantFinale]].
* In ''Manga/KatekyoHitmanReborn'', Tsuna's eyes are normally [[CurtainsMatchTheWindow brown]]. However, when he goes into Dying Will Mode, they change into an [[SupernaturalGoldEyes orange-ish yellow]].
* The eyes of [[DifferentlyPoweredIndividual NEXT]] in ''Anime/TigerAndBunny'' typically change to a bright, glowing [[OccultBlueEyes blue]] when they activate their abilities. This isn't the case for all of them, however -- NEXT with passive abilities don't have an eye color change, the eyes of the two NEXT in Ouroboros glow [[GoodColorsEvilColors orange-yellow]], and [[spoiler:Kotetsu's]] eyes have recently started turning [[RedEyesTakeWarning red]] to go along with his PowerIncontinence.
* In ''{{Yumeria}}'', Neneko has violet/purple eyes, but when [[spoiler: mental time traveler Neito]] takes control of their shared body, they turn green.
* ''Manga/InuYasha'': Both the title character and his half-brother, Sesshoumaru, have eyes that go completely bloodshot-red when their demonic powers are fully released. However, Inuyasha's eyes also change colour according to whether he is in human (black), normal (gold), or {{youkai}} (red) form, because he's a HalfHumanHybrid whose human side is fully expressed during a new moon and whose demon side is fully expressed when he pushes his own natural powers to their limits (in which case, good luck getting him to [[SuperpoweredEvilSide restrain himself to attacking only the bad guys]].)
* In ''DigimonTamers,'' when Beelzemon makes his HeelFaceTurn, his eyes go from [[RedEyesTakeWarning evil red]] to the green of his previous form, Impmon.
* When Lina Inverse of ''TheSlayers'' fame is possessed by the Lord of Nightmares in the end of Slayers NEXT, her eyes, normally red, appear golden.
* In ''TsubasaReservoirChronicle'', vampire's eyes turn gold when they sense blood or are using their powers. [[spoiler:Fai]] experiences this when [[EmergencyTransformation he is turned into a vampire]] to save his life.
* ''Franchise/KagerouProject'': Every character's eyes (which are normally either brown, yellow or pink) turn red when they're using their Eye Powers. In some cases, their pupil also becomes a slit (even if they're usually drawn without one). A more serious example comes when [[spoiler:the usually pink-eyed Konoha's eyes become yellow with slit pupils. It ([[EvilWearsBlack along with the rest of his costume turning black]]) signals that he has been [[DemonicPossession taken over by the Wide-Eyes Snake]] and become Kuroha]].
[[/folder]]

[[folder:Comic Books]]
* When Tigress hijacks ComicBook/{{Flare}}'s body in hope of learning about Teresa's mother, [[http://www.heroicmultiverse.com/flare/webcomic/index.php?pn=204 Teresa's eyes change from blue to green]].
* The '90s ''ComicBook/{{Supergirl}}'' comic had Linda Danvers suspecting something was off when she saw that her eyes permanently changed from brown to blue, after being rescued from a certain death by a cult. [[spoiler:It's because she WAS dying, and the Matrix version of Supergirl merged with her, causing some of her features to wind up reflected in Linda.]]
* Similarly, the ''ComicBook/JusticeSocietyOfAmerica'' relaunch had a plot point where it was revealed that after Kendra Saunders (the current Hawkgirl) had attempted suicide and been revived, her eyes mysteriously changed from green to brown. [[spoiler: This is chalked up to Kendra's soul actually departing and her aunt Shiera taking residence in her body, thus changing Kendra's eye color to what hers (Shiera's) had been]]
* NormanOsborn's eyes change from brown to green when he's using the Green Goblin powers. In ''Comicbook/ThePulse'', this is what first makes ''Daily Bugle'' reporter Terri Kidder realize something is ''very'' wrong.
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[[folder:Fan Fics]]
* ''FanFic/TheInfinityLeague'': Miranda's eyes would change colour when [[spoiler:she activates her power. And now, so do the other characters' eyes when they use theirs]].
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[[folder:Film]]
* In ''Film/TheLostBoys'', vampires' eyes go from their natural colour to red when they transform into 'vampire mode'.
* ''Franchise/StarWars'' has the phenomenon of "[[SupernaturalGoldEyes Sith eyes]]", related to the Dark Side of the Force. They usually aren't permanent and usually manifest when the dark Force-user is enraged (Count Dooku, always calm and collected, never manifests them). Only Darth Maul, who is more or less always belligerent, sports permanent Sith eyes.
* In ''Film/TheAvengers'', Loki's staff changes people's eyes [[OccultBlueEyes blue]] when he mind-controls them. On the DVD commentary, director Creator/JossWhedon explains that this was actually something they added in post-production to make the difference between brainwashed characters and people acting under their own will clear, and so that there was a clear visual sign in [[spoiler:Hawkeye]] when he finally broke out of it, which makes his teammates [[WelcomeBackTraitor taking him back]] more understandable.
* [[NoNameGiven The Girl]] from ''Film/TheNinthGate'' (who is possibly the devil in human form) does this at several points, mostly when her BloodLust gets going.
* Judge Doom from ''Film/WhoFramedRogerRabbit'' has brown eyes up until [[spoiler:he gets squashed by a steamroller, revealing him to be a toon]], at which point his natural {{red eyes|TakeWarning}} appear. This is also the point he stops being calm and collected and starts acting outright psychotic.
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[[folder:Literature]]
* Rachel from [=Cliff McNish=]'s ''Literature/TheDoomspellTrilogy'' has eyes that change colour depending on the spell she is using, these eyes are said to be a wizard trait.
* At the end of ''Literature/SeptimusHeap - Magyk'', Sarah Heap notices that [[spoiler:Septimus']] eyes are becoming green from exposure to Magyk when she identifies him as her child.
* Eyes are often very important in Chris D'Lacey's ''[[Literature/{{Dragons}} Last Dragon Chronicles]]''. If it mentions someone's eye color more than once, it's a good bet that it has either changed or will change soon. Brown, blue, green, black, and violet are the most common.
* ''Literature/TheStormlightArchive''
** It is said that if a person with dark eyes wins a [[SoulCuttingBlade Shardblade]] their eyes will become light. In the [[Literature/TheWayOfKings first book]], we only see one darkeyes with a Blade (Szeth), and they only turn pale blue when he is actively using the Blade. He notes that this is unique to his Blade, so the full situation remains unclear.
** In the [[Literature/WordsOfRadiance second book]], we get more detail. Yes, darkeyes permanently turn light once you've bonded with a Blade (which takes about a week). Full Radiants also have their eyes turn light; in fact, [[spoiler:this process is what the Shardblades are mimicking]]. The influence of Odium has also been shown to give spren and people red eyes, to the point that red eyes are seen as a mark of [[OurDemonsAreDifferent Voidbringers]].
* In ''Literature/TheWheelOfTime'', users of [[TheDarkSide the True Power]] develop black flecks swimming across their eyes as a result of overuse. With continued use, the flecks become more common, and eventually transform the eyes and mouth into caverns of flame.
** People who awaken as a [[OurWerewolvesAreDifferent wolfbrother]] have their eyes turn [[SupernaturalGoldEyes gold]] to match those of a wolf.
* In ''Literature/TheDoorWithin'' Trilogy, the Glimpses eyes change colour depending on their affiliation: Blue for King Eliam, Red for Paragor, and Green for neutral/undecided.
* In Creator/RogerZelazny's ''Literature/DilvishTheDamned'', some witches have eyes that wax and wane with the moon.
* In the ''Literature/BlackJewels'' novels: Jaenelle Angelline's eyes turn from "summer-sky" blue to "sapphire" when she's in Witch mode.
* In the ''Literature/CodexAlera'', the Marat people take on the eyes characteristic of the animal they take as a BondCreature. In particular, in the first book Kitai's eyes turn green when she bonds [[spoiler: Tavi]].
* In Literature/LightningDust'', the eponymous hero's eyes turn bright yellow from their normal blue when Klaus turns into him, while [[spoiler: Daniel's]] sclera (the white part of the eyes) and pupils turn light and dark blue respectively when he becomes Crystal Eye.
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[[folder:Live-Action TV]]
* In the later seasons of ''Series/BabylonFive'', Lyta Alexander's eyes would turn [[BlackEyesOfEvil solid black]] whenever she made use of the [[TouchedByVorlons Vorlon enhancements to her psychic abilities]]. However she became even more powerful in the PostscriptSeason, she acquires GlowingEyesOfDoom instead. Possibly because the black contacts used for the old effect were painful to wear.
* ''Series/BuffyTheVampireSlayer'':
** Whenever Willow makes intensive use of magic, her eyes abruptly turned [[BlackEyesOfEvil pitch-black]] while closed. Then, in the series finale, [[spoiler: when using the scythe to activate all the potential slayers,]] her eyes (and hair) turned white, hinting she was using powerful white magic.
** When Willow buffed up Buffy with magic to fight Adam, Buffy's eyes turned [[SupernaturalGoldEyes gold/yellow]].
* In ''Series/ForeverKnight'', vampires' eyes turn golden when they vamp out.
* In ''Series/{{Merlin}}'', Merlin's eyes turn brownish-gold when he uses magic.
* In the ''Franchise/KamenRider'' franchise, the big, insectlike eyepieces of the Riders often change with the mode the suit is in. In a more sinister vein, they can also change with the mentality of the wearer if the powers present a hazard to his sanity (if a power-up is potentially a SuperpoweredEvilSide, and the Rider's eyepieces turn the color that represents that power source, you wanna be a few dozen counties over.)
* Eye color is a key part of the werewolf mythology in ''Series/TeenWolf''. Alphas have red eyes, and betas have either orange or blue eyes.
* Solid-coloured eyes are used to show demonic possession on ''Series/{{Supernatural}}''. Showing them, rather than the natural eye colour, is voluntary for the demon so it is used for shock value (both in universe and for the audience). Low-level demons use black; more powerful ones get more colourful options such as yellow or white.
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[[folder:Video Games]]
* When [[SpaceElves Faize]] from ''VideoGame/StarOceanTheLastHope'' gets subjected to a lot of stress, his GeneticEngineering causes him to unconsciously suppress it. This gets shown with his eyes turning red.
* In ''Franchise/SonicTheHedgehog'', Sonic's eyes are normally green, but when he goes Super Sonic, they turn red.
* ''Franchise/TalesSeries''
** In ''VideoGame/TalesOfSymphonia'', Colette's blue eyes turn red when she loses her [[spoiler:soul]]; they return to blue when she gets it back again.
** In ''VideoGame/TalesOfSymphoniaDawnOfTheNewWorld'', Emil's normally green eyes turn red whenever his "Ratatosk-mode" personality is in control (usually during battle only). When we first see him, his eyes are gray, because [[spoiler:he hasn't invented a personality yet]].
** In ''VideoGame/XenoSaga'' Episode I: Der Wille zur Macht, KOS-MOS's normally red eyes turn blue when she [[spoiler:saves the Elsa from disintegrating upon entering the atmosphere of Second Miltia]] at the end of the game.
* VisualNovel/DanganRonpa's Fukawa has eyes that change from a soft pinkish-grey to [[RedEyesTakeWarning bright red]] when [[spoiler: her SplitPersonality [[SerialKiller Genocider Syo]] is in charge.]]
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[[folder:Web Animation]]
* ''{{WebAnimation/RWBY}}'''s Yang Xiao Long has purple eyes that turn red whenever she goes in her SuperMode.
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[[folder:Webcomics]]
* Zill from ''Webcomic/{{Zoophobia}}'': Purple to green when he uses his powers.
* ''Webcomic/{{Homestuck}}'' has Kurloz, who uses mind control to change Meulin's (and possibly others) eyes to a deep purple.
* In ''Webcomic/TheSilverEye'', certain character's have eye colours that will change with extreme emotion. This is a sign that they are descended from the Nedarians. If the Nedarian ancestors in question are Melete and Syllor Dolan, they will change to blue or black, and if they are Sienna and Augustine Lewis, they will change to red or brown.
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[[folder:Western Animation]]
* ''WesternAnimation/DannyPhantom'': His human side has blue eyes, his ghostly SuperHero alter ego has green eyes, but whenever he turns evil (either BrainwashedAndCrazy or meeting his [[FutureMeScaresMe evil alternate-future self]]) his eyes turn red.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'':
** Luna has normal pony eyes, but when she's in her Nightmare Moon persona, she has reptile eyes with slit pupils.
** In 'A Canterlot Wedding', Shining Armor when [[spoiler:Queen Chrysalis masquerading as Princess Cadance casts a spell to brainwash him. His eyes turn green and point in different directions. Additionally, Queen Chrysalis in the form of Princess Cadance upon casting Twilight into the dungeons at the end of part one. Her eyes flash blue-green, and her pupils turn reptillian.]]
* ''WesternAnimation/AvengersEarthsMightiestHeroes'': In the episode 'Emperor Stark', when someone is under the control of The Purple Man, their eyes turn purple, and return to normal color when they break free of his control.
* Sandy from ''WesternAnimation/RiseOfTheGuardians''. When he is [[spoiler: impaled by Pitch's black sand arrow, Sandy's pupils become darker and more prominent in response to the darkness consuming his body.]]
* ''WesternAnimation/GravityFalls'': Mabel's eyes turn green when she's had too much Smile Dip. Additionally, looking into the Gremloblin's eyes causes the eyes of two tourists to match the creature's bright yellow ones.
* In the ''Franchise/{{Bionicle}}'' films, Vakama's FaceHeelTurn and subsequent HeelFaceTurn are represented by his orange eyes turning [[SicklyGreenGlow sickly green]], and back. Roodaka, who leads Vakama astray in the first place, has blue eyes that go red when she's angered.
* In ''WesternAnimation/TransformersPrime'', Megatron's eyes go from red to purple when he's using Dark Energon, indicating the substance's power and supernatural influence, and the nasty side effects it has on Megatron's mind.
* ''WesternAnimation/JusticeLeague'' introduced the idea of Green Lantern's eyes lighting up in green whenever he used his powers, which eventually found its way into comics.
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