Abstract

A simple accurate method for quantitative study of nasal patency has long been desired by clinicians and rhinologic research workers. The idea of breathing through nasal passages directly onto a previously cooled mirror or metal surface was introduced in 1889 by Zwaardemaker. 1 He later reported use of his metal mirror as an aid in diagnosis of nasal obstruction. In 1895 Kayser, 2 after using same technic, published his work on the exact measurement of nasal air passages. These measurements were derived from size and shape taken by moisture deposited on metal mirror. In 1904 Glatzel 3 modified mirror by adding two curved lines to aid in determining degree of nasal patency. In 1915 Cocks 4 added some straight lines to this modified mirror and attempted to measure more accurately nasal conditions before and after operations by conformity of moisture deposits

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