摘要:
Ophthalmic device, such as a slit lamp or a visual acuity testing device or a combination of these devices, for variable illumination of the patient's eye with illumination fields of different geometries, wherein the illumination of the patient's eye is generated by means of chip components which are controllable electronically with respect to their light transparency, light reflection or light emission and which are illuminated by reflected light or transmitted light or are self-illuminating.
摘要:
An ophthalmological examination device, especially a slit lamp or a fundus camera, for observing a patient's eye, with at least one image recording unit such as a video camera or a CCD-chip for recording at least a part of the image of the eye generated by the examination device, and with a device for transmitting the electric signals of the video camera or CCD-chip to an image generating unit connected with the head of the observer.In an advantageous manner, it is possible to superimpose on a first image generated from the electric signals of an image recording unit additional information generated by a computer via the image generating unit, at least for one eye of the observer, and/or to display a second image to the observer, which second image is modified with respect to color, contrast or other image features, as an additional image superimposed on the other respective eye or on the first image for one or both eyes of the observer. The additional information comprises stored images and/or stored previous recordings and/or physiological data on the patient.
摘要:
Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye, are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens (IOL) to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.
摘要:
The invention relates to a method for determining distances in the anterior ocular segment, preferably of the pupils and/or the diameter of the iris, wherein the image of at least part of the eye is recorded and digitized using an imaging device and an array for illuminating the eye. On the basis of said digital image, a center of gravity analysis and the determination of the central point are carried out, especially for the position of the pupils, by conducting an intensity and threshold analysis as rough determination. Based on said rough determination, a fine detection of the position of the edges of the pupil and/or the edges of the iris is carried out. Additionally, the angle between the visual axis and the optical axis of the eye can be determined from the position of a fixed reflection to the center of the pupil and/or the center of the iris.
摘要:
The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
摘要:
The invention relates to a method for a non-retarded shutter release of a rotary sector shutter, particularly for use in photogrammetrical aerial cameras comprising a computer means which via a control means for rotating the rotary sectors of the shutter sets the latter to a rate of rotations in a manner that the time of photograph sequence is a multiple integer of the time interval between two feasible open times of the shutter. Probable incorrect exposures are eliminated by a variation of the diaphragm setting.
摘要:
Combined equipment for non-contacting determination of axial length (AL), anterior chamber depth (VKT) and corneal curvature (HHK) of the eye, are also important for the selection of the intraocular lens IOL to be implanted, particularly the selection of an intraocular lens (IOL) to be implanted, preferably with fixation of the eye by means of a fixating lamp and/or illumination through light sources grouped eccentrically about the observation axis.
摘要:
A spectrometer is described, especially for an optical coherence tomograph for detecting parameters of the human eye, with said spectrometer having an input for measurement radiation to be analyzed, fanning the measurement radiation spectrally out along a direction in a fan and guiding it onto a detector that extends along the direction and comprises a plurality of detector pixels that are sensitive to the measurement radiation, with the spectrometer having an adjusting element which can be adjusted in a controlled manner to adjust the relative position of the fan and the detector, thereby optimizing the incidence position of the fan on the detector, in which it is provided that the detector has at least two superimposed, adjacent pixel lines, and a control device is provided which reads out the superimposed pixels of a plurality of pixel lines in a combined manner for a spectral analysis of the measurement radiation in a pixel binning and evaluates signal differences between superimposed pixels to control the adjusting element and to center the incidence position of the fan at a right angle to the direction of the pixel lines.
摘要:
The invention is directed to an arrangement and a method for measuring the anterior segment of the eye using interferometric means. The eye is illuminated by a convergent beam bundle and aligned with the optical axis of the measuring device by generating directional stimuli and accommodation stimuli by means of a display which is mirrored into the beam path.
摘要:
An opthalmological measuring instrument, e.g. for determining the corneal curvature, anterior chamber depth, axial length, or the like, including measuring systems for determining measurement of the mentioned physical parameters. The measuring systems are connected to an evaluation unit which verifies whether quality parameters regarding the measurements are satisfied and generates a corresponding signal that indicates to the medical professional user that a proper measurement can be taken.