USE of the operating microscope has now become a sine qua non for good otologic surgery. Effective use of the microscope demands comfort and in a prolonged operation this requires not only practice, but optimal adjustment of the instrument. If your eyes seem to strain to focus after using the microscope for a few minutes or you are having to refocus with each change in magnification, it is quite likely that the optics of your microscope are not optimally adjusted to you. (It is also possible that you have a refractive or accommodation error which cannot be compensated for by the usual adjustments of the microscope.)
This article will describe a series of steps by which the optimal setting of the eyepieces can be easily derived, and a modification of the eyepiece assembly which will compensate for astigmatic refractive errors.
For those with normal vision in both eyes,
Steffen TN, Urban JC. Use of the Operating Microscope: Adjustment and Compensation for Refractive Errors. Arch Otolaryngol. 1969;90(3):380–382. doi:10.1001/archotol.1969.00770030382022
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