The older otologists, as is evidenced by their application of the lens system to the ear specula, appreciated the need of magnification in order to be better able to study the tympanic membrane and its varied pathologic manifestations. This
Adjustable telescopic otoscope.
same need was obvious at a later date with the introduction of the electrically illuminated otoscopes, which were almost always supplied with a lens system for magnification. The new electrically illuminated device with means of magnification has become very popular, especially with the general practitioner and the pediatrician. However, one drawback to its use is apparent: It has a lens system with a fixed focus. As is well known, the external auditory meatus varies in depth, depending on a number of factors, the most important being that of the age of the patient. A sharp image of the tympanic membrane could be obtained in the fixed focus
GUTTMAN MR. AN ADJUSTABLE TELESCOPIC OTOSCOPE. Arch Otolaryngol. 1932;15(6):911–912. doi:10.1001/archotol.1932.03570030933010
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