Abstract: A method and apparatus for light field microscopy, wherein the following method steps are performed: a) measuring an image data record of a sample using a light field arrangement; b) creating at least one partial data record from the image data record; c) reconstructing a three-dimensional object from the partial data record created in step b).

Abstract: A computer-implemented method for increasing a training data volume for a machine learning system for determining an initial refractive power value for an intraocular lens to be inserted is described. The method includes measuring a group of ophthalmological biometry data of a patient and determining an initial refractive power value for the intraocular lens to be inserted by a trained machine learning system. The measured ophthalmological biometry data and a postoperative target refraction value are used as input data for the trained machine learning system. The method also includes measuring a postoperative refractive results value, assigning the postoperative refractive results value to the measured ophthalmological biometry data of the patient, and determining an importance indicator value for the new training data record.

Abstract: A light microscope having a scanner for scanning a sample with illuminating light and a light detector for measuring sample light. A microlens array having a plurality of microlenses is arranged in front of the light detector in the region of a pupil plane. The light detector respectively has a plurality of detector elements behind each microlens and has a complete readout frequency of at least 100 kHz. By means of the detector elements arranged behind the respective microlens, a wavefront datum regarding the sample light is determined. Moreover, a sample point signal is computed from signals of the detector elements. Illuminating light is successively deflected onto different sample points with the scanner and corresponding sample point signals are captured, wherein, for at least some of the different sample points, a corresponding wavefront datum is also determined. The determined wavefront data can be taken into account in a calculation of a sample image from the plurality of sample point signals.

Abstract: The present invention relates to a device for operating at least one bending beam in at least one closed control loop, wherein the device has: (a) at least one first interface designed to receive at least one controlled variable of the at least one control loop; (b) at least one programmable logic circuit designed to process a control error of the at least one control loop using a bit depth greater than the bit depth of the controlled variable; and (c) at least one second interface designed to provide a manipulated variable of the at least one control loop.

Abstract: System/Method/Device for labelling images in an automated manner to satisfy a performance of a different algorithm and then applying active learning to learn a deep learning model which would enable ‘real-time’ operation of quality assessment and with high accuracy.

Abstract: A method for capturing a relative alignment of a surface (2.1), extending substantially in one plane, of an object (2), in which a focus (f) of a light beam is guided along a scanning path (1). Components of the light beam that are reflected by the surface (2.1) are captured. The scanning path (1) extends substantially parallel to an x-y-plane that extends orthogonally to an optical axis (oA) of a detection objective (5). A relative position and alignment of the surface (2.1) are ascertained on the basis of the reflected components. A normal (N) of the surface (2.1) and the relative alignment thereof are virtually ascertained and/or the focus (F) is moved in the direction of the optical axis (oA) during the scanning of the scanning path (1, 1ax) such that an axial scan trajectory or an axial scanning path (1ax) are brought about.

Abstract: A method of producing a spectacle lens includes providing a substrate having a front surface and a back surface and coating or covering at least one of the front surface or the back surface of the substrate, in full or in part, with a layer. The surface topography of the substrate surface is changed by bringing the surface into contact with a medium and the medium is removed. A product made according to the method and including (i) a spectacle lens or (ii) a representation of the spectacle lens in the form of computer-readable data present on a data medium or (iii) a data medium including a virtual representation of the spectacle lens in the form of computer-readable data or (iv) a representation of the spectacle lens in the form of a computer-readable data signal, is also disclosed.

Abstract: An x-ray source includes an optical communications link to provide a galvanically isolated communication between a system controller and a gun controller. In specific examples, the link is provided through one or more fibers. In addition, the gun controller is preferably remote programmed by the system controller during startup. This addresses the problem of reprogramming a processor in a hard to access location/environment. A watchdog timer is also useful for the gun digital processor of the gun controller.

Abstract: The present invention relates to a method for examining a beam of charged particles, including the following steps: producing persistent interactions of the beam with a sample at a plurality of positions of the sample relative to the beam and deriving at least one property of the beam by analyzing the spatial distribution of the persistent interactions at the plurality of positions.

Abstract: Systems and methods for improved interferometric imaging are presented. One embodiment is a partial field frequency-domain interferometric imaging system in which a light beam is scanned in two directions across a sample and the light scattered from the object is collected using a spatially resolved detector. The light beam could illuminate a spot, a line or a two-dimensional area on the sample. Additional embodiments with applicability to partial field as well as other types of interferometric systems are also presented.

Abstract: The system, method and device includes an optical coherence tomography (OCT) system switchable between single scan mode or multi-scan mode. This is achieved by use of multiple beam splitters to produce multiple OCT beams, but the system still uses a single light source, a single sample arm, and single reference arm to achieve a compact, more cost effective, system. Additionally presented is a spectral domain OCT system with a spectrometer having multiple grating, each providing a different depth and/or resolution imaging capability.

Abstract: A device and method for the pre-display of a spot pattern to be applied for a laser treatment of the eye. The spot patterns to be applied are displayed to the operator in advance with the aid of a target beam. The device for the pre-display of a spot pattern to be applied for a laser treatment of the eye includes a laser system and a scanning system for generating a target beam. Here, the laser system and the scanning system for generating the target beam are formed to generate one or more lines which overlie all the spots of the spot pattern of a planned laser treatment. The device and method are suitable for laser treatment of the retina, the trabecular meshwork as well as other regions. Here, it is irrelevant whether what the laser treatment to be applied is.

Abstract: A device for determining biometric variables of the eye, as are incorporated in the calculation of intraocular lenses including a multi-point keratometer and an OCT arrangement. The keratometer measurement points are illuminated telecentrically and detected telecentrically and the OCT arrangement is designed as a laterally scanning swept-source system with a detection region detecting the whole eye over the whole axial length thereof. Illumination points are arranged in three rings concentrically around an instrument axis; and the three rings include a first ring, a second ring and a third ring and the illumination points on the first ring and the third ring are rotated in relation to the illumination points on the second ring such that each of the illumination points on the first ring is on a common radial with one of the illumination points on the third ring and each of the illumination points on the second ring is not on the common radial.

Abstract: A system for processing a portion in a processing volume of a transparent material by application of focused radiation including a device for generating and an optical system for focusing radiation, with a device for changing the position of the focus of the radiation and a control device. The system includes a controller that controls the ophthalmologic therapy system. The controller is encoded with a scan pattern. The scan pattern includes adjacent strokes with each adjacent stroke having an angle of inclination (?) to the beam axis; and the angle of inclination (?) of the strokes to the beam axis is always larger than or equal to the focal angle (?) of the focused radiation.

Abstract: The present invention relates to a measurement light source for generating measurement light with a uniform spatial illumination intensity distribution. The measurement light source comprises a solid block, in which an illumination space, a light-forming space and a light exit space are each formed as a hollow space in the block and have a diffusely reflecting inner surface. The illumination space opens into the light-forming space. The light-forming space opens into the light exit space. At least one light source is at least partially arranged in the illumination space in order to generate light. The light exit space has a light exit. According to the invention, an axis of the illumination space and an axis of the light exit space are arranged at a distance from one another. The light-forming space is designed for a reversal of a light propagation direction. The invention also relates to a measuring arrangement for detecting at least an absolute reflection spectrum of a sample.

Abstract: A device by which the magnification stages of a magnification selector based on Galilean telescope systems can be adjusted by a motor. The magnification selector has a sensor that transmits the currently magnification stage to a control unit; in the control unit, an assignment of the magnification stages present on the magnification selector to a sequence of the magnification stages, organized based on size, is stored. For the user, there are operating elements connected to the control unit for selecting a magnification stage. In order to set the magnification stage selected by the user via the operating elements, the magnification selector has an actuator, which is connected to the control unit to receive appropriate control signals. Although provided in particular for slit lamps and surgical microscopes having eyepieces, the solution can also be applied in other ophthalmological devices or devices from other technical fields.

Abstract: A method for correcting a shading in a digital image of a three-dimensional observation object obtained by at least one image sensor of an optical observation device is provided. The three-dimensional observation object is illuminated by illumination light and an intensity distribution, and an inhomogeneity in an image brightness is present in the digital image of the three-dimensional observation object. The method includes ascertaining a topography of the three-dimensional observation object, correcting the inhomogeneity in the image brightness of the digital image based on the topography of the three-dimensional observation object and the intensity distribution of the illumination light. In addition, an optical observation system is provided to perform the method.

Abstract: A head-mounted visualization unit is provided with an at least partially light-transmissive optical system. The optical system has a first optical channel assigned to a first eye of a user and a second optical channel assigned to a second eye of the user. The first optical channel is substantially transmissive to optical radiation of a first polarization and substantially opaque to optical radiation of a second polarization, with the first polarization substantially orthogonal to the second polarization. The second optical channel is substantially transmissive to optical radiation of the second polarization and substantially opaque to optical radiation of the first polarization. A polarizer and a light attenuator are arranged in the first optical channel. The light attenuator is arranged downstream of the polarizer in a direction toward the first eye of the user.

Abstract: A method of image evaluation when performing SIM microscopy on a sample includes: A) providing n raw images of the sample, which were each generated by illuminating the sample with an individually positioned SIM illumination pattern and imaging the sample in accordance with a point spread function, B) providing (S1) n illumination pattern functions, which each describe one of the individually positioned SIM illumination patterns, C) providing (S1) the point spread function and D) Carrying out an iteration method, which includes following iteration steps a) to e), as follows: a) providing an estimated image of the sample, b) generating simulated raw images, in each case by image processing of the estimated image using the point spread function and one of the n illumination pattern functions such that n simulated raw images are obtained, c) assigning each of the n simulated raw images to that of the n provided raw images which was generated by the illumination pattern that corresponds to the illumination patter