Micro Photography
Micro photography refers to photomicroscopy and usually there will be no lens on the camera, just a converter as shown in the picture below. There is often confusion between macro and micro photography because camera manufacturers sell macro lenses ( which by definition can reproduce an image at least 1:1 ie a 15mm apple pip would be 15mm on the camera's sensor)under the name of both macro and micro lenses.
The eyepieces are redundent in this application.
The camera is attached by a microscope adapter,
which in essence is just a hollow tube.
It can be moved up or down to achieve focus.
A piece of onion through the microscope