The word Biocular means two eyes in Latin language.
All primates - humans, apes, chimpanzees etc
The eyepiece of a microscope is the top part of the microscope in which you look through to see your magnified object. There is no other name for the eyepiece The eyepiece holds the ocular lens. If there are two eyepieces (one for each eye) they are called biocular lenses.