In general, the diopter of the left and right eyes differs from individual to individual, so the diopter correction rings on each of the left and right eyepieces should be adjusted to the diopter difference of the observer to minimize fatigue when observing.
Flow of diopter adjustments
Align the diopter ring with the engraved base line.
Please do the following.
①Using the 10X objective, rotate the focus knobs, and bring the specimen in focus.
②Switch to the 40X objective lens and turn the fine focus knob to refocus on the sample.
③Switch to the 10X objective again, adjust the focus by individually rotating only the diopter rings on the left and right eyepieces. Repeat steps ② and ③ twice to eliminate the visual differences between the left and right eyepieces.