每个人的眼睛里都有一种被称为黑色素的天然化学物质。人眼中的黑色素越多，颜色越深。
每个人的眼睛里都有一种被称为黑色素的天然化学物质。人眼中的黑色素越多，颜色越深。黑色素之所以重要,是因为它的密度在某种情况下会影响视觉的不适度。有些人假设眼睛颜色可能会影响人们实际看待事物的方式。
黑色素对光分配颜色的方式有影响，并被眼睛反射或吸收。虽然眼睛的颜色不会影响人们看东西的方式，但是眼睛的颜色可以使他们在不同的照明条件下具有不同的视觉能力。虹膜细胞色素中的黑色素浓度通过散布光线来保护虹膜免受较高阳光的伤害。
黑眼睛的人有更高的黑色素含量和密度。这意味着，在明亮的阳光下，黑色素反射眼睛内部的光，它们经历较少的问题与耀眼的太阳。黑色素作为一种保护剂，将光线从虹膜传播出去。这使它们在这些条件下具有更好的对比能力。黑暗的眼睛颜色是一个优势的例子可能是在夜间开车时眩光。
黑色素较少的人往往眼睛颜色较浅，因此他们缺乏对明亮光线的保护，可能经历更多的眩光不适和对比度较小。在阳光下，危险的是有害的紫外线会穿过那些眼睛颜色较浅的人的虹膜，并通过白内障或称为黄斑变性的疾病的发展造成损害。可以佩戴防紫外线太阳镜以减少这些风险。
有一些科学研究表明，眼睛颜色和反应时间之间有一定的关系。那些深色眼睛的人在打网球或拳击之类的事情上表现很好。这些被称为反应性任务。而那些浅色眼睛的人在打高尔夫球或保龄球方面表现更好。这些被称为自定步任务。
虽然某人眼睛的颜色并不直接影响他们如何看待事物，但照明条件可以是影响视力的第二级。无论是什么颜色的眼睛，都建议在白天外出时佩戴防紫外线太阳镜。所有的人都可以体验到紫外线的伤害，任何眼睛的颜色或阴影。
你可能想建立一个科学项目实验来弄清楚哪种眼睛颜色有最好的视觉能力。如果你的家人和朋友有不同的眼睛颜色，你可以做一个测试，看看他们是如何敏感的。
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