Question

WHY IS IT IMPORTANT TO KEEP BOTH EYES OPENED WHEN USING A MONOCULAR MICROSCOPE?

Answer 1

Answer:

If your eyes are too close set or far apart for the intraocular distance to be adjusted properly, you will have to use your microscope as a monocular instrument (i.e. look through one eyepiece with one eye). If you do this, it is important to keep both eyes open in order to avoid eyestrain.