The lens through which we view the image is called the eyepiece lens .
The huygens ocular, which dates back over 250 years is still in wide use today .
If the screen is so far away from the eyepiece that the camera can be placed between .
In both instruments, the image formed by an objective is viewed through an ocular .
Even a careless momentary look through the eyepiece of field glasses or the telescope can do great harm to the eyes .
Light microscopes - marking of objectives and eyepieces
Light microscopes - diameter of interchangeable eyepieces
Engagement between microscope eyepiece and eyepiece sleeves
Marking of microscope objectives and eyepieces