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The size of your eye actually has nothing to do with how far it can see.
你眼睛的大小实际上与它能看多远无关。
First, light passes through the front layer of the eye called the cornea, and into an opening called the pupil.
首先，光线会穿过眼睛的前层--也就是角膜，然后进入一个叫做瞳孔的开口。
The iris is the coloured part of your eye, and this controls how much light the pupil lets in.
虹膜是眼睛的彩色部分，它负责控制瞳孔让多少光线进入眼睛。
Say we are looking at a banana.
假设我们在看一根香蕉。
Light from the environment bounces off the banana and into our eye through the pupil, the dark spot in the middle.
周围环境的光线从香蕉上反射回来，通过瞳孔，也就是中间的黑点，进入我们的眼睛。
It travels through our eye that bends and focuses that light.
光线会穿过我们弯曲的眼睛，并随后聚焦。
This then hits the back of our eye called the retina.
然后到达我们眼睛后部的视网膜。
This is covered in very special cells called photoreceptors, which by some sort of magic, convert these light signals into what we see.
视网膜被一种叫做光感受器的非常特殊的细胞所覆盖，这种细胞通过某种魔力，将这些光信号转化为我们所看到的东西。
