接せつ眼がんレンズ

noun

eyepiece; ocular lens

The lens or lens group closest to the eye in an optical instrument such as a microscope, telescope, or binoculars.

• 顕けん微び鏡きょうの接せつ眼がんレンズをのぞいてみた。

  I looked through the eyepiece of the microscope.