21
PREPARATIONS
7 After adjusting the diopter, turn the slit width control knob until the slit width is about 1mm, then
check if the slit image projected on the test rod is properly in focus.
8 Holding the prism box, look through the eyepiece with both eyes, and adjust the pupillary dis-
tance so that the image projected on the test rod can be seen without diplopia (double vision),
and appear to be three dimensional.
Diopter adjusting ring
Prism box
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