Contact lenses were once thought to be eyeglass killers .
隐形眼镜一度被认为是普通眼镜的杀手。
The old man wears an eyeglass attached to a piece of ribbon .
那老人戴著单片眼镜，上面连结著一条丝带。
Nearly 400 years ago hans lippershey , a dutch eyeglass maker , offered a new optical device to the government for military use , or so the story goes .
