Eye alteration

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Eye alteration
Red Eye's eyes become red when using his ability.

Eye alteration occurs with some evolved humans when their eyes alter from their natural state when using certain abilities.

1 Abilities that cause Eye Alteration
2 Closing eyes
3 Affecting other people's eyes
4 Notes
5 Gallery
6 See Also

Abilities that cause Eye Alteration

Ability	Examples
Accelerated probability	Santiago
Adoptive muscle memory	Monica Dawson
Alejandro's ability	Alejandro Herrera
Aura absorption	Linda Tavara
Clairvoyance	Molly Walker
David's ability	David Sullivan
Empathy	Lydia
Enhanced strength	Michael Fitzgerald
Induced radioactivity	Peter Petrelli, Ted Sprague
Mohinder's ability	Mohinder Suresh
Poison emission	Maya Herrera, Arthur Petrelli
Precognition	Isaac Mendez, Usutu, Peter Petrelli, Sylar, Arthur Petrelli
Precognitive dreaming	Angela Petrelli, Peter Petrelli
Primal rage	Ricardo Silva
Pyrokinesis	Flint Gordon
Spider mimicry	Caleb
Spontaneous combustion	Amanda Strazzulla
Telekinesis	Misha
Terrakinesis	Sparrow Redhouse

Closing eyes

Several abilities require concentration, and the user usually closes his eyes to use it. They are:

Ability	Examples
Clairvoyance	Molly Walker
Precognitive dreaming	Angela Petrelli and Peter Petrelli
Space-time manipulation	Hiro Nakamura, Peter Petrelli, Future Peter and Future Peter.
Spontaneous combustion	Amanda Strazzulla
Technopathy	Micah Sanders

Affecting other people's eyes

Some abilities changes the color of who is affected by it. They are:

Ability	Examples
Appearance alteration	Penny
Primal rage	Sean, Tom and Joseph
Poison emission	Coyote, Gloria, Derek, Molly, Sylar and many others.

Notes

This effect is also manifested in evolved humans who have manifested the ability of others when using the above abilities.
Although Hiro always closes his eyes to invoke space-time manipulation, Arthur wasn't required to do so when invoking that ability. Peter has used this ability both with his eyes open and closed.
Participating in a spirit walk, while not categorized as an ability, has also manifested eye alteration similar to precognition in Matt and Hiro.
While there have been several characters display the ability of pyrokinesis, only Flint has ever shown an example of it affecting specifically his eyes. The same happens to Misha and his telekinesis and Michael Fitzgerald and his enhanced strength.
There are examples when the eyes of evolved humans change in different ways when they use their abilities. For instance, Sparrow Redhouse's eyes glowed orange in Rebellion, Part 2 when she was using her ability, but in Rebellion, Part 6 they glowed red. Also, each evolved human with the ability to paint the future had their eyes turn white - however, Isaac Mendez's eyes turned golden once when he was high on heroin (Collision), and the future events appeared on Sylar's eyes (How to Stop an Exploding Man) before he started painting.
Although usage of shape shifting does not always change the user's eyes, it can be used to do so.

Gallery

That which Monica learns is reflected in her eyes. (Truth & Consequences)	Alejandro's eyes turn black while using his ability. (Lizards)	A symbol appears in Molly's eyes. (The Kindness of Strangers)	Penny Logan's eyes turn from blue back to brown. (Faces, Part 2)
David Sullivan's ability turns his eyes blood-shot red. (The Recruit, Part 3)	Michael Fitzgerald's eyes glow when he becomes strong. (Viewpoints)	Ted's eyes glow after he is shot. (Company Man)	Peter's eyes glow before he explodes. (Godsend)
Mohinder Suresh's eyes are red when he goes to capture Maya. (The Natural Order of Things)	Maya Herrera's poison emission turn her eyes black. (Kindred)	Arthur Petrelli's eyes turn black after absorbing Maya's ability.(Eris Quod Sum)	While high and having a vision, Isaac's eyes glow. (Collision)
Peter start to paint a picture, and his eyes turn white. (Fight or Flight)	What Sylar sees appear on his eyes. (The Hard Part)	Usutu's eyes turn white while painting the future. (One of Us, One of Them)	After stealing Peter's abilities, Arthur eyes turn white and he starts to paint. (The Eclipse, Part 1)
Matt Parkman's telepathy accesses some form of precognition causing his eyes to turn white. (A Clear and Present Danger)	Peter Petrelli's precognitive dreaming turns his eyes into vision reflections. (Fallout)	Molly closes her eyes to find Mr. Parkman. (The Kindness of Strangers)	Micah closes his eyes to talk with the cell phone... (Truth & Consequences)
...but he can do it with his eyes wide open, too. (Bully)	Hiro needs to close his eyes so he can concentrate and teleport. (Six Months Ago)	Peter needs to concentrate. (I Am Become Death)	Future Peter closes his eyes to stop time... (Five Years Gone)
...the same way another Future Peter does...(The Second Coming)	...while the present-day Peter did it once with his eyes wide open. (Unexpected)	Affected by Ricardo's ability, the Kill Squad's eyes turn red and they fight each other. (Red Eye, Part 1)	Maya's poison emission made a Coyote's... (Four Months Later...)
...Gloria's... (Four Months Later...)	and Molly's eyes to turn black. (Powerless)	Santiago's eyes turn orange. (Destiny, Part 1)	Ricardo Silva's primal rage turns his eyes red. (Friend or Foe)
Flint Gordon's pyrokinesis turns his eyes blue. (Rebellion, Part 2)	Misha's telekinesis turns his eyes blue. (Libertad)	Sparrow Redhouse's terrakinesis turns her eyes orange... (Rebellion, Part 2)	...but on another occasion, her eyes glow red. {Rebellion, Part 6)
Amanda's eyes turn from blue to orange as she concentrates on igniting a pair of truck tires. (Amanda's Journey, Part 2)	Caleb's eyes turn green when his ability is used. (Yang & Yang)	Amanda closes her eyes when using her ability. (Slow Burn, Part 7)	Lydia's eye glows yellow as she uses her ability on her boyfriend. (The Painted Lady)