你是否曾经思考过为什么新生儿的眼睛是蓝色的?


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Did you ever wonder why newborn babies have blue eyes? Or how human beings get the various eye colors we have? What pigment in our bodies gives us green or gray or brown eyes? The color of our eyes comes from melanin, the pigment that also colors our hair and skin. At birth, a baby's body isn't finished producing this pigment yet. Over the first year of life, as our eyes develop and our bodies produce more melanin, our irises gradually change from baby blue to their permanent color. So, what produces the color in green or hazel or brown or black eyes? Actually, despite the many different colors that our eyes can have, the color of the actual pigment in all of them is exactly the same. Melanin only comes in one shade, yellow-brown.
你是否曾经思考过为什么新生儿的眼睛是蓝色的?或者为什么我们人类的眼睛有各种不同的颜色?是我们体内的什么色素让我们有绿色、灰色或者棕色的眼睛。 眼睛的颜色来源于黑色素,我们的头发和皮肤的颜色同样来源于黑色素。在出生时,婴儿的体内并没有结束生产黑色素的过程。在生命的第一年里,伴随着我们眼睛的发育及体内黑色素的不断产生,我们的巩膜颜色便逐渐的从婴儿蓝变成他们自身固定的颜色。 不同颜色的眼睛中是什么产生了绿色、淡褐色或者黑色呢?尽管我们的眼睛可以具有多种不同的颜色,实际上所有的颜色中所含有的色素的颜色都是一样的。黑色素仅来源于一种灰暗的棕黄色。