Recent Advances in Otosclerosis

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Abstract
THE ADVANCE in otosclerosis with the most far-reaching effect this year was not investigative or related to surgery. Furthermore, it will affect physicians more than patients. This advance was the adoption of the new International Standardization Organization (ISO) standard for pure tone audiometers by the Committee on Conservation of Hearing of the American Academy of Ophthalmology and Otolaryngology and by the American Otologic Society. The new ISO levels, according to Davis and Kranz,13 are desirable because (1) the shape of the threshold contour is more accurate; (2) the threshold levels are reproducible from laboratory to laboratory and from country to country; and (3) they represent the only apparent escape from permanent ambiguity and confusion in the international exchange of audiometric information. These new ISO levels differ significantly from the American Standard values chosen in 1951, but readings on one of these bases can be readily transferred to readings on

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