Having one section that corrects for distant vision,a second section that corrects for medium vision,and a third that corrects for near vision,as an eyeglass lens.

 
  • 远中近三用的具有分别校正近距离视觉、中距离视觉和远距离视觉的三个部件的,如目镜透镜。
今日热词
目录 附录 查词历史