q: What do people need to see clear? a: glasses q: are they important? a: yes q: Who created them? a: Alessandro di Spina q: When? a: In 1282 q: what was their purpose? a: help people to see q: did they work? a: yes q: how? a: scientists didn't understand how q: did they ever find out how? a: yes q: who found this? a: Johannes Kepler q: did they always stay the same? a: no q: what changed? a: they continued to improve q: how? a: bifocal lenses q: who made those? a: Ben Franklin q: were there other changes? a: yes q: by who? a: George Airy q: what did he change? a: made circle-shaped glasses q: what was their purpose? a: to correct an eye problem q: Who used glasses first? a: The Chinese q: for what? a: fashion q: what did they think of them? c: "I can't see clearly, because I don't wear my glasses today." We always hear people saying something like this. Glasses are very important to many people. Do you know how they were invented and developed? Glasses took a long time to develop into what you can find in the glasses store today. The Chinese first used colored glasses as fashion. They thought that those glasses had magic, but they didn't think that glasses could help eyes to see clearly. In 1262, the inventor, Roger Bacon, discovered the amazing function of lenses , and he thought that glasses could be used to help people to see. Twenty years later, in Florence, Italy, the inventor, Alessandro di 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. Johannes Kepler finally found out how glasses worked. Inventors continued to improve glasses. In 1784, Ben Franklin created glasses that had bifocal lenses. Many years later, in 1827, George Airy made circle-shaped glasses to correct _ , an eye problem that stops the eyes from seeing things clearly.
they had magic