DE202014105027U1 - Device for three-dimensional eye determination - Google Patents

Abstract

Device for three-dimensional eye determination, in particular for determining a front eye section, with - a slit projector (3) which is suitable for illuminating an eye (5) to be examined, which is to be arranged in a measuring position, to emit light beams along an optical axis (4), and - An arrangement with a plurality of Scheimpflug cameras (2a, ..., 2d), each of which is suitable for capturing image data of the eye (5) illuminated by the slit projector (3) in the measurement position for a three-dimensional eye determination, the plurality of Scheimpflug cameras (2a, ... ..., 2d), which can be aligned to the optical axis (4) and / or the measurement position for image data acquisition, are arranged in one or more planes circumferentially around the optical axis (4).

Description

The invention relates to a device for three-dimensional eye determination, in particular for determining a front eye section.

background

Such devices or devices may be equipped for eye examination with a Scheimpflugkamera. For example, they offer the possibility of diagnosing an anterior segment of the eye, especially the anterior chamber of the eye.

The document 1 074 214 B1 describes a device for eye examination with a Scheimpflug camera and a slit projector for taking sectional images of an eye. Scheimpflug camera and slit projector are arranged on a stand. The slit projector and the Scheimpflug camera are rotatably mounted about a common axis, which coincides substantially with the optical axis of the eye to be examined. In order to examine the eye in different relative positions of the Scheimpflug camera with respect to the eye, the Scheimpflug camera is rotated about the optical axis. Here, the slit projector is rotated.

Summary

The object of the invention is to specify a device for eye determination, with which an eye examination can be carried out reliably and efficiently. In particular, the time required for eye determination should be reduced.

To solve the problem, a device for eye determination according to the independent claim 1 is provided. Another device for eye determination is the subject of independent claim 9. Embodiments are the subject of dependent subclaims.

According to one aspect, a device for three-dimensional eye determination is provided, in particular for determining a front eye section. The device has a slit projector which is suitable for emitting light rays along an optical axis in order to illuminate an eye to be examined which is to be arranged in a measuring position. With the help of the light rays, the eye to be examined can be enlightened. The device has an arrangement with several Scheimpflugkameras, wherein an even or an odd number of Scheimpflugkameras may be provided. The multiple Scheimpflug cameras are each suitable for detecting a three-dimensional eye determination image data of the illuminated by the slit projector eye in the measurement position, wherein the multiple Scheimpflugkameras that are aligned for image data acquisition to the optical axis and / or the measurement position, in one or more planes across are arranged circumferentially around the optical axis around it.

According to a further aspect, a device for three-dimensional eye determination is provided, in particular for determining a front eye section, which has a plurality of slit projectors which are suitable for illuminating respectively a different plane of an eye to be examined to be arranged in a measuring position. The device further has a Scheimpflug camera which is suitable for detecting three-dimensional eye determination image data of the illuminated by means of the slit projectors planes of the eye in the measurement position.

The devices may be configured in the various embodiments by means of a control device to record image data with a plurality of Scheimpflug cameras simultaneously and / or successively. In one embodiment, several or all of the Scheimpflug cameras can capture image data at the same time.

In data acquisition, image data for a plane illuminated by the slit projector level of the eye to be determined can be detected.

The acquired image data can then be processed in accordance with conventional image data evaluation, for example with the aid of a computing unit that is part of the device. However, a transmission of the acquired image data to an external computing unit, which is separate from the apparatus for three-dimensional eye determination, can also be provided, for example to a personal computer.

With the aid of the proposed device, a method for three-dimensional eye determination can be carried out, in which image data is acquired with the several Scheimpflug cameras, either simultaneously or successively, whereby the Scheimpflug cameras can be arranged in a fixed position relative to the measuring position, even if successive images are to be taken. It then requires no relocation of Scheimpflugkameras, for example by turning. Similarly, the device with multiple slit projectors and at least one Scheimpflugkamera allows a method for three-dimensional eye determination, in the Scheimpflugkamera image data for the different illuminated planes of the eye are detected, either simultaneously or sequentially, the slit projectors even in successive recorded images, can be arranged stationary in their relative position to the measuring position.

By means of the devices, the time required for a three-dimensional eye determination can be reduced. When one of the devices is used in conjunction with an ophthalmic operation, for example laser-assisted surgery, the burden on the patient can be reduced.

The patient whose eye is being diagnosed may be in a sitting or lying position.

The multiple Scheimpflug cameras may be circumferentially spaced equidistantly around the optical axis. In the case of an even number of Scheimpflug cameras, these may be arranged in pairs opposite each other about the optical axis. For example, if four Scheimpflug cameras are used, they may be arranged around the optical axis in the 0 degree, 90 degree and 270 degree positions.

The arrangement with the plurality of Scheimpflugkameras may be rotatable about an axis which corresponds substantially to the optical axis. In this embodiment, the plurality of Scheimpflug cameras may be mounted on a rotatable upright member which is rotatable about the axis. If the several Scheimpflug cameras are fixed relative to one another in their relative position, the arrangement of the Scheimpflug cameras fixed in this way can be brought into different rotational positions with respect to the axis.

The arrangement with the plurality of Scheimpflugkameras may be made non-rotatable with respect to the optical axis.

The several Scheimpflug cameras can be fixed relative to each other in their relative position. In this embodiment, the relative position of the Scheimpflug cameras in the one or more planes transverse to the optical axis is not adjustable or changeable, but fixed. For example, the plurality of Scheimpflug cameras may be fixedly mounted together on a stand component or on a stand-alone stand component.

The slit projector can be set up to emit monochromatic light beams of different wavelengths for illuminating. The slit projector can hereby be set up to provide the monochromatic light of different wavelengths simultaneously or successively for the purpose of determining the eye. In this way, different measuring methods can be realized. Thus, it can be provided to carry out the eye determination simultaneously for a plurality of monochromatic light beams.

A light intensity emitted by the slit projector for illuminating light beams can be regulated. This makes it possible, for example, to adjust the light intensity of the slit projectors or in dependence of the examined eye. Thus, the light intensity can be downshifted with cloudy eye lens compared to the examination of a non-clouded eye lens.

It can be provided that the light irradiated onto the eye to be examined is guided through one or more filters, for example a polarization filter.

The plurality of Scheimpflug cameras may include an image data sensor for acquiring digital image data. The digital image data can then be correspondingly processed in a computing unit of conventional image data processing to determine a three-dimensional image of the eye or a part thereof, in particular a front eye portion.

The embodiments explained above, in particular with regard to the arrangement of the plurality of Scheimpflug cameras, can be provided in a comparable manner with the device having a plurality of slit projectors and at least one Scheimpflug camera.

Description of exemplary embodiments

In the following, further embodiments will be explained with reference to figures of a drawing. Hereby show:

1 a schematic representation of a device for three-dimensional eye determination from the front,

2 a schematic representation of the device 1 from the side and

3 a schematic representation of another device for three-dimensional eye determination from the front.

1 shows a schematic representation of an apparatus for three-dimensional determination of an eye, which on a stand 1 an arrangement with several Scheimpflug cameras 2a , ..., 2d as well as a slit projector 3 having. The stand 1 is with a stand component 1a and a stand base 1b educated.

At another stand component 1c are the several Scheimpflug cameras 2a , ..., 2d firmly mounted in a plane transverse to the optical axis 4 , along which the light beams provided by the slit projector to the eye to be examined 5 spread out. The other stator component 1c can be rotatable or non-rotatable on the stand 1 be stored.

With the help of the slit projector 3 becomes the eye to be examined 5 lit by the slit projector 3 along the optical axis 4 Light rays on the eye to be examined 5 irradiates. With the help of several Scheimpflug cameras 2a , ..., 2d can be illuminated levels of the eye to be examined 6 be detected simultaneously and / or sequentially, so as to provide digital image data, which can be subsequently evaluated in a computing unit (not shown) by means of image processing to a three-dimensional image of the eye to be examined 5 to obtain, in particular a front eye portion.

The several Scheimpflug cameras 2a , ..., 2d are each cameras that meet the Scheimpflug condition. The Scheimpflug condition requires that the plane of the points, that is, the plane illuminated here of the eye, the main plane of the camera lens system and the image plane intersect in a common axis. Scheimpflug cameras as such are known in various embodiments from the prior art. The same applies to the gap generator 3 ,

3 shows a schematic representation of another device for three-dimensional eye determination from the front. Unlike the device 1 are several slit projectors 3a , ..., 3d intended. The hereby enlightened levels of the eye 5 be with the help of the Scheimpflug camera 2 added.

The features disclosed in the above description, the claims and the drawings may be important both individually and in any combination for the realization of the various embodiments.

Claims (9)

Device for three-dimensional eye determination, in particular for determining an anterior eye segment, comprising - a slit projector ( 3 ), which is suitable for illuminating an eye to be located in a measuring position ( 5 ) Light rays along an optical axis ( 4 ), and - an arrangement with several Scheimpflugkameras ( 2a , ..., 2d ), which are respectively suitable for a three-dimensional eye determination image data of the slit projector ( 3 ) enlightened eye ( 5 ) in the measuring position, wherein the several Scheimpflugkameras ( 2a , ..., 2d ) used for image data acquisition to the optical axis ( 4 ) and / or the measuring position are aligned, in one or more planes transverse to the optical axis ( 4 ) are arranged circumferentially around this. Apparatus according to claim 1, characterized in that the several Scheimpflugkameras ( 2a , ..., 2d ) about the optical axis ( 4 ) are circumferentially spaced equidistantly around. Apparatus according to claim 1 or 2, characterized in that the arrangement with the several Scheimpflugkameras ( 2a , ..., 2d ) is rotatable about an axis which is substantially the optical axis ( 4 ) corresponds. Apparatus according to claim 1 or 2, characterized in that the arrangement with the several Scheimpflugkameras ( 2a , ..., 2d ) with respect to the optical axis ( 4 ) is not rotatable. Device according to at least one of the preceding claims, characterized in that the several Scheimpflugkameras ( 2a , ..., 2d ) are fixed relative to each other in their relative position. Device according to at least one of the preceding claims, characterized in that the slit projector ( 3 ) is set to emit monochromatic light beams of different wavelengths for illuminating. Device according to at least one of the preceding claims, characterized in that a light intensity of the light from the slit projector ( 3 ) for illuminating emitted light beams is controllable. Device according to at least one of the preceding claims, characterized in that the several Scheimpflugkameras ( 2a , ..., 2d ) comprise an image data sensor for acquiring digital image data. Device for three-dimensional eye determination, in particular for determining a front eye section, with - a plurality of slit projectors ( 3a , ..., 3d ), which are each suitable for a different plane of an eye to be arranged in a measuring position ( 5 ), and - a Scheimpflug camera ( 2 ), which is suitable for a three-dimensional eye determination image data by means of slit projectors ( 3a , ..., 3d ) enlightened levels of the eye ( 5 ) in the measuring position.

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