opera glasses

noun

1. 观剧小望远镜
   small binoculars that people use in a theatre to see the actors or singers on the stage

1. Of an optical system ( e.g. eye or opera glasses) adjusted to produce a clear image.
   指光学系统（例如眼睛或者看戏用的望远镜）调整以产生清晰的图像。

noun

1. an optical instrument designed for simultaneous use by both eyes

   Synonym:    binocularsfield glasses