Microscope use, blurred vision
I am using a very cheap stereomicroscope to check the edge of the razor while honing. My problem is that after a few hours of honing my vision becomes blurry, I have a bit of a headache, and this fades away totally only after a few hours.
What I am using atm is an old microscope made in Ukraine, with one eyepiece. In the histology lab at the university we are using good quality binocular microscopes, and I have neved had this problem there before.
If I get a microscope with better optics than will this problem get better? Or will it be better if I get a binocular one? The truth is that I want to keep the costs low, so I don't want to spend more than 50-100$ on it.
Thanks for your help in advance! :)