I used to be a big fan of GTO[Great Teacher Onizuka] when I was a student. I am pretty sure you don’t know this anime since it is a very old series, so I shall quickly explain the summary. The story is simple, a 22-year-old Onizuka who used to be the head of the gang starts a new life as a teacher in Kichijoji[吉祥寺, does this ring a bell to you if you know Cafe吉祥寺で]. The class he shall manage is actually the worst at the school. All of the teachers have been boycotted because of the harrassment by the students. Onizuka tries to understand the students and figure out why they hate the teachers.
At any rate, there is a girl I really like in this anime. She is Kanzaki Urumi[神崎麗美]. I will tell you about her more later, so now please look at her right eye. It’s light-blue, isn’t it? Just one eye is colored…that is オッドアイ[odd eye]. Technically, it’s called Heterochromia[ヘテロクロミア] Iridis and in Japanese, we say 虹彩異色症[kousai ishokushou] or 金目銀目[kinme ginme]. This is often seen among cats or dogs, and as for human beings it’s very rare. But it sure exists. In the history, Aleksandros ho Megas had オッドアイ. Because of such a legend, it is said people who have オッドアイ have a mysterious power to see things we can’t see. Yes, we say 邪眼[jagan] or 魔眼[magan]. So オッドアイ seems to be kind of charming though I wonder how those who have it actually feel. This is basically a kind of physical disorder, so it requires understanding and patience to treat it as a genre of moe.
In real life colored eyes have no special power, however, it is not in anime. If there is a character who has オッドアイ in the series, watch out, there is a story.
Kanzaki Urumi has a deep secret with her birth. In fact, she is a test-tube girl. Her mother bought an intelligent man’s one from the sperm bank. We are never told who her father actually is, but that is why she is extremely intelligent. Just because her father could be a Caucasian, it doesn’t mean she has オッドアイ. But it has something to do with that…At any rate, she is almost an outcast in the class because of her awesome intelligence (besides, the school treated her as a special student). In such a time, just a female teacher of her was nice to her when she was 10 or so. Urumi was so happy that she came to her place to study almost every single day. The teacher actually got frustrated as Urumi even surpassed her, so there was nothing to teach. When Urumi pointed out her mistake during the lesson, she spoke out the secret that Urumi was a test-tube girl in front of all the classmates. Since then, she stopped trusting people and that is why she hates teachers.
One more example, here is Oskar von Reuenthal[オスカー・フォン・ロイエンタール] whose nickname is Bewitching Eyes from Legend of the Galactic Heroes[銀河英雄伝説]. He used to be maltreated by his mother because of his eye when he was a kid. Even though he acts like a playboy, he doesn’t trust women at heart.
Okay, I shall pick up someone from more recent series…then it is still old but I mustn’t forget Suiseiseki and Souseiseki from Rozen Maiden. Their eyes are green and red, but as if they have totally different thoughts each other, the colored eyes are placed in a reversed position.
Since the big hit of Rozen Maiden, we have seen a lot of characters who have オッドアイ, haven’t we? Ryomo Shimei[呂蒙子明] from Ikkitousen[一騎当千] and Iba Itsuki from Rental Magica. Ryomo Shimei possesses Ryubi’s dragon in her left eye. Itsuki possesses Glam Sight [fairy eye, 妖精眼] in his right eye. The common point is that both are using an eye patch[眼帯, gantai] to cover. Putting aside オッドアイ, we can find such a half-eyed character so easily in anime, can’t we? If either eye is covered or veiled with something(mostly front hair), you can say 片目キャラ[katame chara] or メカクレ[mekakure], and such a girl is 目隠れっ娘[mekakrekko]. Of course, if you love such a girl, you have 目隠れっ娘萌え[mekakurekko moe]. If both eyes are covered, it is メカクレ like Belphegor in Katei Kyoushi Hitman! Reborn. My favorite is Dokuro-chan, her eye patch is a moe to me, yes I have 眼帯萌え[gantai moe]!
Back to the topic, as odd-eyed characters become popular, cosplayers are willing to buy カラコン[colored contacts] to copy. Now young people including アゲ嬢 are buying them for fashion, and they are not so expensive at a discount store. But know this, those contacts have no prescription, so it would be dangerous to wear for hours. If possible, you had better buy prescripted ones for your eyes. I have light blue, purple, red, and yellow brown ones. I wear contacts only when I cosplay, and as soon as I finish, I take off.
As I have said, Heterochromia is kind of a disorder so this might require your understanding. We have to be aware of the fact that there are people who have Heterochromia, and I am hoping we could understand and accept the differences in order to enjoy the creativity.