Optics is the study of light and vision in science and engineering.

光学是在科学和工程方面对光和视觉的研究。

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What effect does light have on vision? What do light and vision mean with age?

光线的强弱对视觉有什么意义？随着年龄的变化光线与视觉的关系又如何？

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That dream has being long gone since I came to the cities of modern world where we build walls and roofs to limit our vision where we light up the sky to mask true light.

自从我来到现代世界的各个城市以来，那个梦已经消失的无影无踪了。在这些城市里，我们建造了高墙和屋顶来限制我们的视觉，而且我们点亮天空以便掩饰真正的光线。

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They play tricks and dance to the accompaniment of the Baroque-era music of the Jesuit missions, then around midnight fireworks pop from the top of their wide-brimmed hats, symbolizing the gift of light and vision to live respectfully.

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And, of course, there were the girls dressed in honour of St Lucia, who is the patron saint of light and vision and is thus much celebrated in a place where the winter sun barely rises above the horizon.

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Even his own memoir is heavy on personal history and light on vision for the country.

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