eyepieces
n. 目鏡( eyepiece的名詞複數 )
The eyepiece of a microscope or telescope is the piece of glass at one end, where you put your eye in order to look through the instrument.
Water won't hurt these binoculars, but raindrops on your eyepieces will definitely spoil your view.
雖然雨水不能損壞這具望遠鏡, 但落在目鏡上的雨滴會令望遠鏡中的景物模糊.