'''Basic Trope''': In {{Anime}}, the eyes of a character who is in great distress become a lifeless color.
* '''Straight''': After it's revealed that Takashi is cheating with Chikako, Arisu's eyes become that of a lifeless color.
* '''Exaggerated''': After the reveal, Arisu become unable to see with her eyes, which are now lifeless.
* '''Downplayed''': After it's revealed that Takashi is cheating with Chikako, Arisu's eyes become lifeless until she blinks a few times.
* '''Justified''': Arisu's eyes have special condition that is affected by the hormones in her body, it's reflecting her unhappy feeling.
* '''Inverted''':
** After the reveal, Arisu's eyes become livelier, because she's a {{Yandere}}.
** After the reveal, Arisu's eyes [[GlowingeyesOfDoom glow]] [[RedEyesTakeWarning red]] with anger.
* '''Subverted''': After the reveal, Arisu's eyes become a lifeless color... but it's because she's wearing new contact lenses.
* '''Doubly Subverted''': ...which she does to subtly show the world around her that she's unhappy.
* '''Parodied''':
** After the reveal, Arisu's eyes become heterochromatic and/or TechnicolorEyes.
** There is a infomertial about the dangers of dull lifeless eyes.
* '''Zig Zagged''': ???
* '''Averted''': Despite the anime extensively use the eyes of the character to express their feelings, no character have DullEyesOfUnhappiness even when they're in HeroicBSOD.
* '''Enforced''': "We don't have enough budget to show subtle character emotions, so just give them DullEyesOfUnhappiness".
* '''Lampshaded''':
** "Arisu-chan, your eyes are scarily lifeless"., [[OhCrap said Chikako.]]
** "I'm pretty sure bad eyes would be the last sign of an impending breakdown".
* '''Invoked''': Arisu gets [[WoundedGazelleGambit dull contacts in order to get sympathy from others.]]
* '''Exploited''': ???
* '''Defied''': ???
* '''Discussed''': "You know Arisu from the next class? After she caught Takashi cheating with Chikako, her eyes become lifeless. Scary!"
* '''Conversed''': [[Series/MysteryScienceTheater3000 MST3000]] comments that "Arisu should REALLY get some visine about now".
* '''Deconstructed''': After the reveal, Arisu's eyes become lifeless, but it's actually a manifested physical condition of serious mental breakdown. And as she spiral downward into insanity, her eyes become more and more lifeless.
* '''Reconstructed''': After therapy and proper medication assisting in a beneficial spiral where she regains her mental health, Arisu's eyes are shown to become more lively over time (or in specific circumstances after therapy, like the healing power of [[CutenessProximity kittens]])
* '''Played For Laughs''': Jamememba sees Arisu's eyes and attempts to use an eydropper to cheer her up.
* '''Played For Drama''': The characters know that Arisu's lifeless eyes are indicator of her nearing snap, so they do their best to prevent it from happening. Arisu is a known {{Yandere}}.
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%% Optional items, added after Conversed, at your discretion:
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%%* '''Implied''': ???
%%* '''Plotted A Good Waste''': ???