The endoscope, in particular laryngoscope and epipharyngoscope

摘要

A magnifying lens incorporated in an endoscope optical system for viewing an illuminated area to be examined by means of the endoscope is adjustable between end positions in which it lies behind and in front of the focus of the optical system respectively, whereby to enable general examination of said area at a relatively small magnification and a more detailed examination of said area at a relatively higher magnification. A viewing window of an endoscope optical system is heated by an electrical heating conductor to guard against clouding of the viewing window, for example by the breath of a patient.