Abstract: An apparatus for carrying out an eye-related measurement on a person includes a device for generating a fixation target with a holographic element. To generate the fixation target, the holographic element is illuminated by a light source. As a result of the illumination, the fixation target arises as a virtual holographic object. The eye-related measurement is conducted on an eye or the eyes of the person fixating the fixation target. Information is conveyed to the person by switching between different fixation targets.

Abstract: An apparatus for carrying out an eye-related measurement on a person includes a device for generating a fixation target with a holographic element. To generate the fixation target, the holographic element is illuminated by a light source. As a result of the illumination, the fixation target arises as a virtual holographic object. The eye-related measurement is conducted on an eye or the eyes of the person fixating the fixation target. Information is conveyed to the person by switching between different fixation targets.

Abstract: An apparatus for carrying out an eye-related measurement on a person includes a device for generating a fixation target with a holographic element. To generate the fixation target, the holographic element is illuminated by a light source. As a result of the illumination, the fixation target arises as a virtual holographic object. The eye-related measurement is conducted on an eye or the eyes of the person fixating the fixation target. Information is conveyed to the person by switching between different fixation targets.

Abstract: A method for determining the habitual head posture of a subject includes recording the head posture over a period of time and determining a preferred head posture from the recording. Also, an apparatus (100) for determining the habitual head posture of a subject includes a recording device (110) for recording the head posture over a period of time and a determining device (112, 114) for determining a preferred head posture from the recording.

Abstract: A method and an apparatus serve for checking the centering of spectacles worn by a spectacle wearer. The method comprises the steps of: a) measuring spectacle lenses mounted in a frame of the spectacles, wherein a position of permanent markings on the spectacle lenses is acquired relative to a coordinate system defined by the frame by means of an image recognition system; b) determining positions of nominal centering points, prescribed in a file, of the spectacle lenses in dependence on data of the spectacle lenses containing the position of the permanent markings; c) measuring physiological data of a spectacle wearer wearing the spectacles and determining positions of actual centering points of the spectacle lenses from the physiological data by means of a video centering instrument; d) determining the difference between the positions of the nominal centering points and the actual centering points; and e) comparing the difference to a prescribed difference threshold.

Abstract: An eyesight testing apparatus examines associated heterophoria of the eyes of a subject. The apparatus includes an image generation device having a display unit for generating test patterns for display to the eyes. An optical assembly is arranged on that side of the display unit facing the eyes. This assembly separates light supplied by a first group of selected zones of the display unit from light supplied to a beam path by a second group of selected zones of the display unit. The left eye only receives the light from the first group. The light from the second group only passes to the right eye. The optical assembly includes a prism matrix having a multiplicity of prism portions extending in the vertical direction and each having a lens-shaped region with a convex surface facing the display unit.

Abstract: A method for determining the habitual head posture of a subject includes recording the head posture over a period of time and determining a preferred head posture from the recording. Also, an apparatus (100) for determining the habitual head posture of a subject includes a recording device (110) for recording the head posture over a period of time and a determining device (112, 114) for determining a preferred head posture from the recording.

Abstract: A method and an apparatus serve for checking the centering of spectacles worn by a spectacle wearer. The method comprises the steps of: a) measuring spectacle lenses mounted in a frame of the spectacles, wherein a position of permanent markings on the spectacle lenses is acquired relative to a coordinate system defined by the frame by means of an image recognition system; b) determining positions of nominal centering points, prescribed in a file, of the spectacle lenses in dependence on data of the spectacle lenses containing the position of the permanent markings; c) measuring physiological data of a spectacle wearer wearing the spectacles and determining positions of actual centering points of the spectacle lenses from the physiological data by means of a video centering instrument; d) determining the difference between the positions of the nominal centering points and the actual centering points; and e) comparing the difference to a prescribed difference threshold.

Abstract: A measuring brace is removably fastened to a spectacle frame. The measuring brace has a traverse and two legs. A front face of the measuring brace is provided with at least three front target marks for measuring the forward angle (?) of a spectacle frame to be measured. At least one of the front target marks is disposed spatially offset relative to the at least two other front target marks, essentially perpendicular to the front face of the measuring brace. The measuring brace has coupled clamping elements provided for fastening the spectacle frame (32). In addition, a measuring brace is suggested which is removably fixed to a spectacle frame and in which at least three lateral target marks (27, 27?, 28, 28?, 29, 29?) are provided for measuring an angle of twist (?). The invention also relates to an arrangement and a method for determining the forward tilt angle (?) and the angle of twist (?) of a spectacle frame.

Abstract: An apparatus (3) for determining centering data for eyeglasses (2) comprises a fixation device (5) and a recording unit (4) that can be triggered by a computer, records electronic images, and is disposed behind a divider element (8). The fixation device (5) produces at least one speckle pattern. The speckles can be superposed by different patterns, for example, a cross shape. The invention further relates to a method for determining centering data. The inventive method and apparatus allow to measure for test persons having the most different acuity of vision the relative centering data from a short distance while maintaining their usual posture.

Abstract: A measuring brace is removably fastened to a spectacle frame. The measuring brace has a traverse and two legs. A front face of the measuring brace is provided with at least three front target marks for measuring the forward angle ? of a spectacle frame to be measured. At least one of the front target marks is disposed spatially offset relative to the at least two other front target marks, essentially perpendicular to the front face of the measuring brace. The measuring brace has coupled clamping elements provided for fastening the spectacle frame (32). In addition, a measuring brace is suggested which is removably fixed to a spectacle frame and in which at least three lateral target marks (27, 27?, 28, 28?, 29, 29?) are provided for measuring an angle of twist (?). The invention also relates to an arrangement and a method for determining the forward tilt angle (?) and the angle of twist (?) of a spectacle frame.

Abstract: An apparatus (3) for determining centering data for eyeglasses (2) comprises a fixation device (5) and a recording unit (4) that can be triggered by a computer, records electronic images, and is disposed behind a divider element (8). The fixation device (5) produces at least one speckle pattern. The speckles can be superposed by different patterns, for example, a cross shape. The invention further relates to a method for determining centering data. The inventive method and apparatus allow test persons having the most different acuity of vision to measure the relative centering data from a short distance while maintaining their usual posture.

Abstract: An apparatus and a method are used for adapting a position of at least one spectacle lens of a spectacle relative to the position of a pupil of an eye of a person, the eye being associated to the spectacle lens. The apparatus comprises an illuminating device for an eye area of the person wearing a spectacle frame that is not yet fitted with lenses. Further, at least one camera for generating an image of the eye area is provided. The position of the pupil within the image is marked. The illuminating device has at least one light source operating within a wavelength range the light of which being reflected by the retina of the eye at a high ratio of reflection. The camera in its sensitivity is optimized to the wavelength of the light emitted by the light source.