Por que os olhos das pessoas têm cores diferentes?

Como médico especialista em oftalmologia, é sempre interessante abordar questões relacionadas aos olhos e suas características. Uma pergunta comum é por que os olhos das pessoas têm cores diferentes. Então, permita-me explicar brevemente o motivo por trás dessa variação na cor dos olhos.

A cor dos olhos é determinada principalmente pela quantidade e tipo de pigmentos presentes na íris, bem como pela maneira como a íris dispersa a luz que passa por ela. A íris é a parte colorida do olho e tem uma camada anterior e uma camada posterior. O principal pigmento responsável pela cor dos olhos é a melanina, que também é responsável pela cor da nossa pele e cabelo.

Olhos castanhos têm uma maior quantidade de melanina na camada anterior da íris, enquanto olhos azuis têm uma quantidade menor de melanina. Os olhos verdes, por outro lado, têm uma quantidade intermediária de melanina. A dispersão da luz na íris também desempenha um papel na percepção da cor dos olhos, e isso pode afetar a maneira como percebemos a cor em diferentes condições de iluminação.

Além da melanina, outros fatores, como herança genética, também influenciam a cor dos olhos. A cor dos olhos é uma característica poligênica, o que significa que é determinada por vários genes. Isso explica por que a cor dos olhos pode variar amplamente entre membros da mesma família.

Em resumo, a cor dos olhos é determinada pela quantidade e tipo de pigmentos presentes na íris, a dispersão da luz na íris e fatores genéticos. Essa combinação de fatores resulta na ampla variedade de cores de olhos que vemos nas pessoas ao nosso redor.

Dr. Lucas Tavares Faria
Dr. Lucas Tavares Faria

Dr. Lucas Tavares Faria é natural de Belo Horizonte, filho de Oftalmologista e descendente da primeira Óptica da cidade. Especialização em Oftalmologia e o fellowship de retina clínica e cirúrgica realizados no Centro Oftalmológico de MG, vem se dedicando ao tratamento clínico e cirúrgico das afecções oculares com foco nas cirurgias de Catarata, Retina e Refrativa.

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