Abstract: An HMD apparatus including a head mount to be mounted on the head of a user, a camera having a predetermined field of view, and a display module, both mounted to the head mount. When the head mount is mounted on the head, the predetermined field of view is greater than a visual field of a first eye of the user, and the camera records an image of the surroundings located in the field of view in the viewing direction of the first eye. The camera transmits the image to the display module which presents the image to the first eye of the user such that the image is located completely within the user's visual field.

Abstract: The present invention is directed to an arrangement and a method for eye examination and/or for determining biometric eye data in which the movement of the eyes is compensated through the use of an eye tracker unit. The arrangement comprises a controllable digital illumination unit and an observation system which are arranged on separate supporting arms. A central control unit has connections to an image recording unit, an optical imaging system, an eye tracker unit and an output unit. Further, transmitter elements and/or actuating drives are provided at the separate supporting arms, at the zoom system and at the magnification changer. The examination can be adapted in an optimal manner to the task at hand by means of the structured illumination patterns that can be generated in a variable manner. Detection of all adjusting parameters relevant for recording can be used for calculations and for reconstructing the pertinent observation conditions. In case of repeated examinations for determining changes, e.g.

Abstract: An electronic visual aid is provided that includes an evaluating unit, which is supplied with a recording of an information carrier on which information standing out visibly from the background is displayed. The evaluating unit determines a brightness distribution of the recording and derives from the brightness distribution a brightness threshold value lying in the transition zone between a zone of the brightness distribution associated with the background and a zone of the brightness distribution associated with the information. The visual aid also includes an image processing unit which generates from the recording a binary image having only two different, predetermined brightness values, by respectively assigning to the pixels of the binary image the first of the two brightness values when the brightness of the corresponding pixel of the recording is below the brightness threshold value, and otherwise assigning the second brightness value.

Abstract: An arrangement and method for positioning an ophthalmologic device with respect to the patient's eye to be examined in x-, y- and/or z-coordinates. The device includes a controllable illumination unit, an observation system, an image recording unit, a central control unit, an output unit, an eye tracker unit, and a device for relative positioning. The imaging system of the eye tracker unit has at least two different adjustable magnifications. In positioning the ophthalmologic device, the signal of the eye tracker unit is used to track a measuring mark and/or grid structure projected on the eye, and also to detect the position of the patient's eye with respect to the optical axis of the ophthalmologic device. The inventive solution makes it possible to automatically position the entire device with respect to the eye to be examined, thus simplifying examination and accelerating determination of biometric data.

Abstract: The present invention is directed to a method and an arrangement for automatic detection, documentation and reproduction of the adjusted magnification. The magnification steps are read off at the rotational axis of the magnification changer, monitored by a control unit and stored for reproducing the magnification setting. For this purpose, a cylinder is arranged on the rotational axis of the magnification changer, this cylinder having a quantity of magnets with radially oriented magnetic fields which divide the cylinder into segments. An arrangement of sensors which are fixedly connected to the housing is located opposite from these magnets for detection of their magnetic fields. The quantity and arrangement of sensors correspond to the quantity and arrangement of magnets. The solution supports a comprehensive computer-assisted control of the instruments and offers the possibility of defined standardized sequences.

Abstract: What is provided is an observation system, comprising a modulator which comprises a two-dimensional modulator region formed by a plurality of pixels; a control unit, which is connected to the modulator and by means of which the pixels are each independently switchable into first and second conditions; intermediate imaging optics which project an object to be viewed onto the two-dimensional modulator region, wherein, of the radiation incident on the pixels due to the projection by means of the intermediate imaging optics, only that radiation which impinges on the pixels being in the first condition passes into an optical observation path.

Abstract: A microscopy system for eye surgery with an objective lens is suggested, which provides a retroillumination system to generate a so-called red reflex illumination during an eye-surgical treatment, in particular during a cataract operation.

Abstract: The present invention is directed to an arrangement and a method for eye examination and/or for determining biometric eye data in which the movement of the eyes is compensated through the use of an eye tracker unit. The arrangement comprises a controllable digital illumination unit and an observation system which are arranged on separate supporting arms. A central control unit has connections to an image recording unit, an optical imaging system, an eye tracker unit and an output unit. Further, transmitter elements and/or actuating drives are provided at the separate supporting arms, at the zoom system and at the magnification changer. The examination can be adapted in an optimal manner to the task at hand by means of the structured illumination patterns that can be generated in a variable manner. Detection of all adjusting parameters relevant for recording can be used for calculations and for reconstructing the pertinent observation conditions. In case of repeated examinations for determining changes, e.g.

Abstract: A method for improving vision of a low-vision person and a viewing aid therefore are disclosed. An image is recorded by means of an image recording device, the image being intermediately stored within an image memory and modified and presented to the eyes of the person by means of an image display device being mounted on the head of the person. An image is recorded within a recording mode and the modified image is transferred to the image display device within a display mode. The display mode is initiated in an interval in time with regard to the image recording mode, the interval in time being manually adjustable.

Abstract: The present invention is directed to an arrangement and method for positioning the device with respect to the patient's eye to be examined in x-, y- and/or z-coordinates. The ophthalmologic device comprises a controllable illumination unit, an observation system, an image recording unit, a central control unit, an output unit, an eye tracker unit, and means for relative positioning. The imaging system of the eye tracker unit has at least two different adjustable magnifications. In the method for positioning the ophthalmologic device, the signal of the eye tracker unit is used not only to track a measuring mark and/or grid structure projected on the eye but also to detect the position of the patient's eye with respect to the optical axis of the ophthalmologic device. The solution proposed with the ophthalmologic device according to the invention makes it possible to automatically position the entire device with respect to the eye to be examined.

Abstract: The invention relates to a method for recording the position of an object in space, comprising a fixing step in which three light sources are fixed to the object such as to define a triangle, an activation step, in which the light sources are switched on, a recording step in which the object, with switched on light sources, is simultaneously recorded from a first and a second position and an evaluation step in which the positions of the light sources are determined in the recordings and the position of the object calculated from the positions of the light sources.

Abstract: What is provided is an observation system, comprising a modulator which comprises a two-dimensional modulator region formed by a plurality of pixels; a control unit, which is connected to the modulator and by means of which the pixels are each independently switchable into first and second conditions; intermediate imaging optics which project an object to be viewed onto the two-dimensional modulator region, wherein, of the radiation incident on the pixels due to the projection by means of the intermediate imaging optics, only that radiation which impinges on the pixels being in the first condition passes into an optical observation path.

Abstract: A display system is provided, comprising a display device for three-dimensional display of an image; a control unit which causes the image to be displayed; and an input unit connected to the control unit, via which input unit movements can be input in two space coordinates, wherein the control unit is switchable into a first mode and into a second mode differing therefrom, and wherein the control unit converts the input movements, in the first mode, into a movement of the image relative to first and second display coordinates and, in the second mode, into a movement of the image relative to at least a third display coordinate.

Abstract: The present invention is directed to a method and an arrangement for automatic detection, documentation and reproduction of the adjusted magnification. The magnification steps are read off at the rotational axis of the magnification changer, monitored by a control unit and stored for reproducing the magnification setting. For this purpose, a cylinder is arranged on the rotational axis of the magnification changer, this cylinder having a quantity of magnets with radially oriented magnetic fields which divide the cylinder into segments. An arrangement of sensors which are fixedly connected to the housing is located opposite from these magnets for detection of their magnetic fields. The quantity and arrangement of sensors correspond to the quantity and arrangement of magnets. The solution supports a comprehensive computer-assisted control of the instruments and offers the possibility of defined standardized sequences.

Abstract: An image display device is provided, comprising imaging optics having an exit pupil, said imaging optics generating a projection of an image perceivable by an observer, and comprising pupil optics, said pupil optics spatially multiplying the exit pupil of the imaging optics and/or moving the exit pupil.

Abstract: A microscopy system for eye surgery with an objective lens is suggested, which provides a retroillumination system to generate a so-called red reflex illumination during an eye-surgical treatment, in particular during a cataract operation.

Abstract: In a projection arrangement for projecting an image onto a projection surface, there are provided a light source (26), a control unit (25), a light modulator (10), which is controllable by said control unit (25) in order to generate an image on the basis of predetermined image data, an optical device (11), arranged following said light modulator, for projecting said image onto the projection surface (34), a film stage (2) for holding a positive image recorded on a carrier medium, projection optics (3), arranged following the film stage (2) when projecting the positive image, and a control device (6), allowing either to direct light from the light source (26) to the light modulator (10) or to illuminate a positive image, which is held by the film stage (2), with said light. Thus, a projection arrangement is provided which can project both positive images and images generated on the basis of predetermined data onto a projection surface (34).

Abstract: In a projection arrangement for projecting an image onto a projection surface, there are provided a light source (26), a control unit (25), a light modulator (10), which is controllable by said control unit (25) in order to generate an image on the basis of predetermined image data, an optical device (11), arranged following said light modulator, for projecting said image onto the projection surface (34), a film stage (2) for holding a positive image recorded on a carrier medium, projection optics (3), arranged following the film stage (2) when projecting the positive image, and a control device (6), allowing either to direct light from the light source (26) to the light modulator (10) or to illuminate a positive image, which is held by the film stage (2), with said light. Thus, a projection arrangement is provided which can project both positive images and images generated on the basis of predetermined data onto a projection surface (34).

Abstract: A projection arrangement for projecting an image onto a projection surface, said arrangement comprising a light source (26), a film stage (2), arranged following said light source, for holding a positive image recorded on a carrier medium, and projection optics (3) for projecting a illuminated positive image, is provided with a control unit (25), a light modulator (10) controllable by said control unit in order to generate an additional image on the basis of predetermined image data, said light modulator being followed by an optical device (11) for projecting the additional image onto the projection surface (34), and with a beam splitter (6) arranged between the light source (26) and the film stage (2) so as to split the light from the light source (26) into a first partial beam directed to the film stage (2) in order to illuminate the positive image and into a second partial beam which may be directed to the light modulator (10).

Abstract: A projection arrangement for projecting an image onto a projection surface, said arrangement comprising a light source (26), a film stage (2), arranged following said light source, for holding a positive image recorded on a carrier medium, and projection optics (3) for projecting a illuminated positive image, is provided with a control unit (25), a light modulator (10) controllable by said control unit in order to generate an additional image on the basis of predetermined image data, said light modulator being followed by an optical device (11) for projecting the additional image onto the projection surface (34), and with a beam splitter (6) arranged between the light source (26) and the film stage (2) so as to split the light from the light source (26) into a first partial beam directed to the film stage (2) in order to illuminate the positive image and into a second partial beam which may be directed to the light modulator (10).