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September 1969

Use of the Operating Microscope: Adjustment and Compensation for Refractive Errors

Author Affiliations

Los Angeles; Burbank, Calif
From the Department of Otolaryngology, University of Southern California, and the Los Angeles Foundation of Otology (Dr. Steffen) and the Urban Engineering Company, Burbank, Calif (Mr. Urban). Dr. Steffen is now at the Department of Otolaryngology, University of Louisville.

Arch Otolaryngol. 1969;90(3):380-382. doi:10.1001/archotol.1969.00770030382022

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.

Normal Vision  For those with normal vision in both eyes,

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