Abstract: A depth information detection device detects an item of depth information relating to a user's head, including a distance from the user's head to the device. On the basis of this depth information and, if applicable, additional information such as images, an evaluation device determines the desired parameters for fitting the spectacles, such as centering parameters.

Abstract: Catadioptric eyepiece system having an exit pupil, comprising a display having a surface disposed in an object plane; optics providing a beam path from the display to the exit pupil and being configured to image a portion of the object plane into an intermediate image formed in a curved intermediate image plane; wherein the optics comprise: a lens system of positive optical power comprising at least one lens, wherein the lens system is disposed in the beam path downstream of the display and upstream of the intermediate image; a concave first mirror disposed in the beam path downstream of the intermediate image and upstream of the exit pupil; and a first beam splitter disposed in the beam path between the lens system and the first mirror and between the first mirror and the exit pupil.

Abstract: A multifocal representation device with a digital image generation module and a control unit, which conveys to the digital image generation module two-dimensional image data of a three-dimensional object to be represented, is provided, wherein the digital image generation module, based on the two-dimensional image data conveyed, generates two-dimensional images of the object from at least two different object planes in corresponding different focal planes in such a way that an observer can focus with his eye on the different focal planes in order to perceive the represented object three-dimensionally, and wherein the control unit determines for each two-dimensional image to be represented a sharpness value in sections and sets the image data to dark for the image sections the sharpness value of which lies outside a sharpness value range predetermined for the image.

Abstract: An apparatus for determining an ametropia of an eye 3 comprises a measurement light source 15 and beam formation optics 17 and an analysis module 35 comprising a detector 39 and analysis optics 37. The analysis optics are configured to focus a parallel light beam, entering through the optical interface 27, along a predetermined line extending transverse to a direction of the analysis beam path. The detector is a spatially resolving detector, wherein an acute angle between a surface normal of the detection area and the predetermined line is less than 80°. A controller 53 is configured to obtain light intensity data detected by the detector and to determine ametropia-data representing the ametropia of the eye based on the light intensity data.

Abstract: An apparatus for determining an ametropia of an eye 3 comprises a measurement light source 15 and beam formation optics 17 and an analysis module 35 comprising a detector 39 and analysis optics 37. The analysis optics are configured to focus a parallel light beam, entering through the optical interface 27, along a predetermined line extending transverse to a direction of the analysis beam path. The detector is a spatially resolving detector, wherein an acute angle between a surface normal of the detection area and the predetermined line is less than 80°. A controller 53 is configured to obtain light intensity data detected by the detector and to determine ametropia-data representing the ametropia of the eye based on the light intensity data.

Abstract: A multifocal representation device with a digital image generation module and a control unit, which conveys to the digital image generation module two-dimensional image data of a three-dimensional object to be represented, is provided, wherein the digital image generation module, based on the two-dimensional image data conveyed, generates two-dimensional images of the object from at least two different object planes in corresponding different focal planes in such a way that an observer can focus with his eye on the different focal planes in order to perceive the represented object three-dimensionally, and wherein the control unit determines for each two-dimensional image to be represented a sharpness value in sections and sets the image data to dark for the image sections the sharpness value of which lies outside a sharpness value range predetermined for the image.

Abstract: The invention relates to an internal combustion engine (1), in particular in a motor vehicle, having a fresh air system (3) for supplying fresh air, which is extracted from the environment (20) of the internal combustion engine (1), to combustion chambers (13) of the internal combustion engine (1), and having a degassing system (5) for discharging blowby gas from a crankcase (6) of the internal combustion engine (1) and for supplying the blowby gas to the fresh air of the fresh air system (3). Furthermore, the degassing system (5) has an oil separator (35) for removing oil from the blowby gas. In order to improve the performance of the oil separator (35), a vacuum opening valve (37) is connected to the crankcase (6). Said vacuum opening valve (37) opens as a function of a vacuum prevailing in the crankcase (6), and then permits an inflow of fresh air into the crankcase (6).

Abstract: The invention relates to an internal combustion engine (1), in particular in a motor vehicle, having a fresh air system (3) for supplying fresh air, which is extracted from the environment (20) of the internal combustion engine (1), to combustion chambers (13) of the internal combustion engine (1), and having a degassing system (5) for discharging blowby gas from a crankcase (6) of the internal combustion engine (1) and for supplying the blowby gas to the fresh air of the fresh air system (3). Furthermore, the degassing system (5) has an oil separator (35) for removing oil from the blowby gas. In order to improve the performance of the oil separator (35), a vacuum opening valve (37) is connected to the crankcase (6). Said vacuum opening valve (37) opens as a function of a vacuum prevailing in the crankcase (6), and then permits an inflow of fresh air into the crankcase (6).