Answer: eyepiece

AnswerCrossword Clue
EYEPIECE

Microscope part

EYEPIECE

Monocle

EYEPIECE

Someone should look into it

EYEPIECE
Microscope component
EYEPIECE
Jeweler's loupe
EYEPIECELens.
EYEPIECEMonocle.
EYEPIECETelescope part
EYEPIECEOptical-instrument part
EYEPIECEIt's worth looking into
EYEPIECETelescopic part
EYEPIECELens
EYEPIECEBinoculars part
EYEPIECECrosshair setting