人用眼睛视物是有限度的,因此看不见遥远的星球,也看不见微生物.对于视力不济的人,日常生活也会感到困难.在公元13世纪时人们已用玻璃造出了透镜片,用来改善视力,因此就诞生了眼镜.1608年的一天,荷兰密得尔堡一家眼镜店的老板詹森无意中,把两个凸透镜装到一个金属管中,用来观察街道上 Human eyes are limited in their vision, so they cannot see distant planets or microorganisms. People with poor eyesight also experience difficulties in daily life. Lenses were made of glass in the 13th century. Used to improve vision, so the glasses were born. One day in 1608, Jensen, owner of an optical shop in Fort Lauderdale, Netherlands, inadvertently put two lenticular lenses into a metal tube to observe the streets.