"I can't see clearly, because I forgot to wear my glasses today." We always hear people saying something like this. Glasses are very important to many people.
Glasses took a long time to develop into what you can find in the glasses store today. They thought that those glasses had magic, but they didn't think that glasses could help eyes to see.
In 1262, the inventor Roger Bacon, discovered the amazing function (功能) of lenses (镜片). Twenty years later, in Florence Italy, the inventor, Alessandrodi Spina, made the first pair of glasses that could help people to see.
Although these glasses worked, scientists didn't understand how glasses helped eyes to see. They thought that eyes sent out light onto whatever a person was looking at, and then the light came back to the eyes, so people could see. Inventors continued to improve glasses. In 1784, Ben Franklin created glasses that had bifocal (双焦点的) lenses. Astigmatism is an eye problem that stops the eyes from seeing things clearly.
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A. He thought that glasses could be used to help people to see. B. Do you know how they were invented and developed? C. In 1604, the scientist, Johannes Kepler, finally found out how glass worked. D. Many years later. George Airy made circle - shaped glasses to correct astigmatism. E. The Chinese first used coloured glasses as fashion. |
