JPH0288038A - Ophthalmologic device - Google Patents

Abstract

PURPOSE:To obtain a measured value having high reliability with alignment accuracy measured at the best condition by providing the alignment detecting means detecting the alignment information with an eye under examination from the size of the received light quantity in a light receiving means, and the display means displaying an alignment condition according to the output from the light receiving means. CONSTITUTION:The image of the cornea Ec of an eye under examination illuminated with observing lighting 10 transmits a half mirror 5 via the optical system of lenses 3 and 4, and enters in an observing camera 11. An incident light flux is converted into an image signal, synthesized with an alignment level mark, showing an alignment condition produced in a character generation circuit 9 with a composite circuit 12, and image-outputted at real time to a TV monitor 13. An alignment drive circuit is operated to make alignment while the image of an eye E under examination outputted to the monitor 13 is observed by an examiner, at that time, alignment is roughly made to some degree by visual observation, then moreover the alignment is conducted to maximize an alignment level mark 14 displayed on the monitor 13, and thereby alignment accuracy is more improved than that in the past.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an ophthalmological device, such as an intraocular pressure measuring device, which requires high precision in alignment between the eye to be examined and the measuring device.

[Prior art] In conventional ophthalmological equipment, alignment adjustment between the subject's eye and the measuring device is performed by fixing the subject's face on a face support device and visually viewing the subject's face on a TV monitor for observation. The operating lever was operated in order to align the subject's eye with the alignment mark.

[Problem that the invention seeks to solve] However,
In a measuring device such as an intraocular pressure measuring device that requires high precision in alignment, there is a limit to the ability to perform alignment while visually observing a TV monitor.

An object of the present invention is to provide an ophthalmological apparatus that can perform more accurate alignment of the eye to be examined and a measuring device.

[Means for Solving the Problems] In order to solve the above-mentioned problems, there are provided a projection means for projecting an alignment detection light beam onto the eye to be examined, and a light receiving means for receiving the reflected light beam of the detection light beam from the eye to be examined. , an ophthalmological apparatus having an alignment detecting means for detecting alignment information with the eye to be examined from the magnitude of the amount of light received by the light receiving means, further comprising a display means for displaying an alignment state according to the output of the light receiving means.

[Example] Hereinafter, an example of the present invention will be described in detail using the drawings. FIG. 1 is a block diagram of an embodiment in which the present invention is applied to an intraocular pressure measuring device, in which light generated from an alignment detection light source 1 is reflected by a half mirror 2 and passes through an optical system consisting of lenses 3 and 4. The cornea EC of the eye E to be examined is irradiated through the beam. Corneal E. The reflected light beam passes through the original optical system, is reflected by the half mirror 5, and is received by the photoelectric conversion element 6. The photoelectrically converted output signal is digitized by an A/D converter 7 and input to an arithmetic processing circuit 8 . The arithmetic processing circuit 8 determines the degree of alignment, and the character generation circuit 9 generates an alignment level mark according to the degree of alignment.

Further, the image of the cornea EC of the eye to be examined illuminated by the observation illumination 10 passes through the half mirror 5 through the optical system of the lens 3.4, and enters the observation camera 11. The incident light flux is converted into a video signal, which is combined in a composite circuit 12 with an alignment level mark representing the alignment state generated by the character generation circuit 9, and is outputted as a video signal to a TV monitor 13 in real time.

The examiner operates an alignment drive circuit (not shown) while observing the image of the eye E outputted to the TV monitor 13 to perform realignment. so that the alignment level mark 14 displayed above is at its maximum.
By further performing alignment, alignment accuracy can be improved compared to the conventional method. In this embodiment, the alignment level mark 14 is divided into several stages, as shown in FIG. It is not limited to this, and for example, numerical values or words may be displayed.

Note that the present invention can be applied not only to the above-mentioned intraocular pressure measuring device but also to various ophthalmological devices such as an ocular refractometer and an ocular axial long needle.

[Effects of the Invention] As explained above, measurement can be performed at the location with the best alignment accuracy, and highly reliable measurement values can be obtained. In addition, by performing visual alignment to some extent and then performing alignment using display marks, it is possible to quickly align to an accurate position.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, and Fig. 2 is a display diagram of an alignment level mark displayed on a TV monitor. EC... Cornea of the eye to be examined, 1...
・Light source for alignment detection,

Claims (1)

[Claims] 1. A projection means for projecting an alignment detection light beam onto the eye to be examined, a light receiving means for receiving the reflected light beam of the detection light beam from the eye to be examined, and alignment information with the eye to be examined from the magnitude of the amount of light received by the light receiving means. What is claimed is: 1. An ophthalmological apparatus comprising an alignment detection means for detecting an alignment state, the ophthalmological apparatus comprising a display means for displaying an alignment state according to an output of the light receiving means.