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I find that it helps if your chair's height places you vertically in line with the eyepieces. If you are sitting higher and have to bend over to view the scope then you are stressing your back out. You want to be able to just move forward a little and have the eyepiece in your face while sitting up right.

Sadly I cannot do this in my lab space because all of the chairs are pretty old and don't have the vertical adjustment feature on them. I have been spending five hours blocks looking at soil samples for Nematoceran immatures the last week.
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I finally found some Ceratopogonid pupae today!!!