眼睛附近也有一种被称为睫状肌的肌肉。当人需要看清远近距离不同的物体,则需要睫状肌调整晶状体形状。当人需要看清近在眼前的物体,比如阅读,晶状体就会变厚;而当人需要看清远处的东西,比如骑自行车时,晶状体就会变得很薄。眼睛最大的部分是玻璃体,约占据了眼睛的容积的2/3,而且玻璃体也决定了眼睛的形状。
The retina also uses special cells called rods (about 120 million of them) and cones (7 million) located in each eye to help it process light. The rods see in black, white and gray and passes along the shape of what is seen. It also can tell the difference between colors, and helps a person's vision when there is very little light. Cones are more helpful in bright light.
视网膜上有特殊的视杆细胞,每只眼睛上约有1.2亿个视杆细胞和7亿个视锥细胞用于处理光线。视杆接收黑色、白色和灰色光线并且传递所看到物体的形状。视杆细胞还可以区分颜色,并用于夜视力。而视锥细胞在光线明亮时发挥的作用更大。
In summary, there are many parts of the eyes that work together to help you see and enjoy the different sights and colors surrounding you throughout the day.
总之,无数眼睛内的组织协同作用使得人类看到和欣赏不同的风景以及周边的五光十色。
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2020-09-15
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