虹膜異色症的美麗與哀愁

UK: IMAGES OUTSIDE OF PRINT NEWSPAPER SUBSCRIPTIONS. FEES APPLY FOR UNIQUE IPAD USE. Editorial Use Only. No stock, books, advertising or merchandising without photographer’s permission Mandatory Credit: Photo by Lorraine Hudgins / Rex Features (1681538a) Speedy the cat has different coloured eyes – one blue and the other gold. Odd-Eyed Cat: Feline Has One Blue Eye And One Gold A domestic cat called Speedy was born with bi-coloured eyes – one is blue and the other is gold.  The odd-eyed cat has a feline form of complete heterochromia, a condition that also occurs in some other animals. The condition most commonly affects white-coloured cats but may be found in a cat of any colour, provided that it possesses the white spotting gene.  Lorraine Hudgins took the photographs of Speedy while she kept her company at her desk. Mrs Hudgins said: “She belongs to the owners of the print shop where I work as a graphic designer.  “I took some photos of her playing with my computer mouse while she was helping me out with my work. “She’s a sweet tempered cat that loves attention – when she’s not curled up in a corner asleep.”  Speedy is also deaf, but Lorraine and Speedy’s owners say she copes well nonetheless. MUST CREDIT PICTURES TO: Lorraine Hudgins / Rex Features For more information visit http://www.rexfeatures.com/stacklink/VDWBQAGLV
UK: IMAGES OUTSIDE OF PRINT NEWSPAPER SUBSCRIPTIONS. FEES APPLY FOR UNIQUE IPAD USE. Editorial Use Only. No stock, books, advertising or merchandising without photographer’s permission Mandatory Credit: Photo by Lorraine Hudgins / Rex Features (1681538a) Speedy the cat has different coloured eyes – one blue and the other gold. Odd-Eyed Cat: Feline Has One Blue Eye And One Gold A domestic cat called Speedy was born with bi-coloured eyes – one is blue and the other is gold. The odd-eyed cat has a feline form of complete heterochromia, a condition that also occurs in some other animals. The condition most commonly affects white-coloured cats but may be found in a cat of any colour, provided that it possesses the white spotting gene. Lorraine Hudgins took the photographs of Speedy while she kept her company at her desk. Mrs Hudgins said: “She belongs to the owners of the print shop where I work as a graphic designer. “I took some photos of her playing with my computer mouse while she was helping me out with my work. “She’s a sweet tempered cat that loves attention – when she’s not curled up in a corner asleep.” Speedy is also deaf, but Lorraine and Speedy’s owners say she copes well nonetheless. MUST CREDIT PICTURES TO: Lorraine Hudgins / Rex Features For more information visit http://www.rexfeatures.com/stacklink/VDWBQAGLV

彭巧蓁

所謂的虹膜異色症指的是二邊眼睛瞳孔顏色不一樣,或是有一邊的瞳孔顏色有部份變異。虹膜異色症不只會發生在動物身上,人也有發病的可能,只是比起來發生在狗或貓身上的機率較大。虹膜異色症的顏色組合通常一邊為藍色,另一邊則可能為黃色、橘色、綠色或褐色。

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為什麼會發生虹膜異色症?

發病原因大部份為先天性的遺傳基因作祟,尤其是白貓或是有部份白毛的貓咪特別容易出現虹膜異色,白色毛髮的基因被發現和虹膜異色症有很大的關係。

有少部份為後天性的原因,例如生病、受傷或是因為手術而導致視神經受損,造成其後單邊的瞳孔黑色素漸漸減少而出現瞳孔異色的現象。

虹膜異色=聽覺障礙?

這種情況通常發生在白色貓咪的身上,色素缺乏的基因除了影響到瞳孔顏色之外,也會影響耳道內耳蝸的生長;因為耳蝸其實也是從色素細胞分化而成,因此白貓藍眼的那一邊耳朵較容易有聽覺障礙,而即使是二邊瞳孔都是藍色也有可能會出現聽覺的問題。根據統計,藍眼白貓出現聽覺障礙的機率大約為60%~80%左右。

雖然是虹膜異色症是先天性基因的缺陷所導致,但不可否認的,異色雙瞳讓牠們看起來更具神秘美感。

參考資料/圖片來源:http://matome.naver.jp/odai/2135260602054753701

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