Abstract: An optical device for generating images with a three-dimensional effect is disclosed. The device can include a first observation channel, a second observation channel that can be present simultaneously, or alternated in intervals, with the first observation channel. The device can also include a first diaphragm arranged in the first observation channel and having a first aperture. The first aperture can include a first semimajor axis, a first semiminor axis perpendicular to the first semimajor axis such that an extension of the first aperture in a direction of the first semimajor axis is greater than an extension of the first aperture in a direction of the first semiminor axis. Further, the device can include a second diaphragm arranged in the second observation channel and having a second aperture, that can have a second semimajor axis and a second semiminor axis.

Abstract: An optical device for generating images with a three-dimensional effect is disclosed. The device can include a first observation channel, a second observation channel that can be present simultaneously, or alternated in intervals, with the first observation channel. The device can also include a first diaphragm arranged in the first observation channel and having a first aperture. The first aperture can include a first semimajor axis, a first semiminor axis perpendicular to the first semimajor axis such that an extension of the first aperture in a direction of the first semimajor axis is greater than an extension of the first aperture in a direction of the first semiminor axis. Further, the device can include a second diaphragm arranged in the second observation channel and having a second aperture, that can have a second semimajor axis and a second semiminor axis.

Abstract: The invention relates to a method for generating a signal which corresponds to the degree of opening of the vocal folds of the larynx, in which the vocal folds are illuminated by means of a light source and are optically observed by means of an endoscope and a signal which is modulated by the movement of the vocal folds, the vocal fold signal, is displayed and/or recorded, wherein the vocal folds are illuminated with light having a wavelength greater than 600 nm or with red light, and wherein the light which is modulated by the movement of the vocal folds, the vocal fold light, is received by a sensor and is detected in order to generate a vocal fold signal which can be visualised, and visible light which contains little infrared or red light is used at the same time to observe the vocal folds.