the light of one's eyes

基本解释

An image of my mother's light-the-world smile--the one before it all happened--flashed in front of my eyes.
我母親在生病以前、簡直能照亮全世界的燦爛微笑的畫麪又映現在我眼前。
One of them even turned back to look at him, and although he could not see him clearly, the man's eyes shone with a lustful light, like a famished person's at the sight of food.
一個還廻頭看他，樣子不甚分明，但很像久餓的人見了食物一般，眼裡閃出一種攫取的光。
However, using light to find one's own way around requires vastly more energy, since the eyes have to detect the tiny fraction of the light that bounces off each part of the scene.
但是，眼睛必須去識別周圍景象反射的細微光線，所以若要用光線來探路就需要遠遠比這多的能量了。

Researchers outfitted rats with goggles that flashed a light in one of the animal's eyes to signal the rat to lick a spout in order to receive a drop of water.
MSN: Goggle-wearing rats show link between learning, rewards