eyepiece, eye-piece = okular (np. w mikroskopie)

Zoom Eyepiece (1.25\\&qout

Source: http://www.opticsplanet.net/picture-1-meade-8mm-24mm-zoom-eyepiece-series4000.html

okular (np. w mikroskopie)

eyepiece , eye-piece = okular (np. w mikroskopie)

English sentence and Polish translation

You need to adjust the eyepiece to see that far. = Musisz ustawić okular, żeby widzieć tak daleko.