JP6735963B2 - Ophthalmic equipment - Google Patents

Description

The present invention relates to an ophthalmologic apparatus for inspecting at least two eye characteristics including an eye refractive power test.

2. Description of the Related Art Conventionally, as an ophthalmologic apparatus for inspecting eye characteristics, for example, an intraocular pressure measuring apparatus for non-contact measurement of intraocular pressure as disclosed in Patent Document 1 or a patent document 2 as disclosed in Patent Document 2 has been used. There is a corneal endothelial cell imaging device for observing the cell state of the cornea, particularly the corneal endothelium.

Japanese Patent No. 5443225 Japanese Patent No. 2580464

However, in the conventional tonometry device and corneal endothelial cell imaging device, the position of the fixation lamp is fixed and does not change. Therefore, there is a problem in that the fixation lamp does not appear sufficiently in a subject having a strong refraction power, so that the fixation is not sufficiently performed and the measurement accuracy is deteriorated.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a fixation lamp based on an eye refractive power test result in an ophthalmologic apparatus that tests at least two eye characteristics including an eye refractive power test. An object of the present invention is to provide an ophthalmologic apparatus that can be moved and moved to improve the accuracy of measurement.

In order to achieve the above-mentioned object, the invention according to claim 1 is an ophthalmologic apparatus for inspecting at least two eye characteristics including an eye refractive power test, and is a fixed device for presenting to an eye to be examined at the time of the eye refractive power test. has a target, the fixation have different fixation lamp is a light source for illuminating the target, in a case of testing different eye characteristics eye refractive power examination, the solid based on the eye-refractive-power examination results characterized in that moving the Mito, characterized by sharing a part of the fixation optical system used for the fixation lamp and the eye refractive power examination.

The invention according to claim 2 of the present invention is characterized in that, in the ophthalmologic apparatus according to claim 1, the fixation lamp and the optotype used for the eye refractive power test are simultaneously moved.

Further, the invention according to claim 3 of the present invention is the ophthalmologic apparatus according to claim 1 or 2, wherein an eye characteristic test other than the eye refractive power test is performed in the ophthalmologic apparatus that tests the two eye characteristics. It is characterized by being an intraocular pressure test.

The invention according to claim 4 of the present invention is the ophthalmologic apparatus according to claim 1 or 2, wherein an eye characteristic test other than the eye refractive power test is performed in the ophthalmologic apparatus that tests the two eye characteristics. It is a corneal shape inspection.

The invention according to claim 5 of the present invention is the ophthalmologic apparatus according to claim 1 or 2, wherein an eye characteristic test other than the eye refractive power test is performed in the ophthalmologic apparatus that tests the two eye characteristics. It is characterized in that it is a corneal endothelial cell test.

As described above, the ophthalmologic apparatus according to the present invention can move the fixation lamp to a position in focus with respect to the subject by moving the fixation lamp using the eye refractive power test result. .. Therefore, even a subject with a strong refractive power can be visually recognized without blurring the fixation lamp, and reliable fixation can be performed, so that the measurement accuracy is improved.

It is a schematic block diagram of the optical system (at the time of eye refractive power inspection) of the ophthalmologic apparatus which concerns on one Example of this invention. It is a schematic block diagram of the optical system (at the time of intraocular pressure inspection) of the ophthalmologic apparatus which concerns on one Example of this invention. It is a block diagram of the control system of the ophthalmologic apparatus which concerns on one Example of this invention. It is a figure explaining the operation flow of the ophthalmologic apparatus which concerns on one Example of this invention. In an ophthalmologic apparatus according to an embodiment of the present invention, a schematic configuration diagram of an optical system (during an eye refractive power test) that allows a part of each fixation optical system to move simultaneously during an eye refractive power test and an intraocular pressure test. Is.

Hereinafter, an ophthalmologic apparatus according to an embodiment of the present invention will be described with reference to the drawings.

[One Embodiment]
1 and 2 are diagrams illustrating details of an optical system of an ophthalmologic apparatus according to the present invention. FIG. 1 is a diagram showing an optical system during an eye refractive power test, and FIG. 2 is a diagram showing an optical system during an intraocular pressure test. FIG. 3 is a block diagram for explaining the overall configuration of the ophthalmologic apparatus including the control system according to the embodiment of the present invention. An ophthalmologic apparatus according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

As shown in FIG. 3, the ophthalmologic apparatus 1 controls a head unit in which an optical system for inspecting an eye to be inspected and an optical system in the head unit are controlled, and an image of an anterior segment taken and an inspection result are taken. It is composed of a main body part including a monitor for displaying. At the time of inspection, the head unit is moved in the XYZ (left, right, up, down, front and rear) directions with respect to the main unit to inspect the eye to be inspected.

(Optical system for eye refractive power inspection)
FIG. 1 shows an entire optical system (optical system for inspecting eye refractive power) at the time of inspecting the eye refractive power of an eye to be inspected. The eye refractive power inspection optical system includes an alignment optical system 100 including a light source 101 to profile sensors 107 and 108, an observation optical system 300 including a two-dimensional image sensor (CCD) 306 from a light source 301 and 302, and a fixation target. 512 to a light source 514, a relay lens 403, and a fixation optical system 400 including a mirror 404, and a light source 501 to an eye refractive power optical system 500 configured to detect the eye refractive power of an eye to be examined, which is composed of a flat glass 511. .. As shown in FIG. 1, each of the optical systems forming the optical system for inspecting eye-refractive power is configured such that a part thereof is shared. Then, the mouth part is rotated and flat glasses 510 and 511 for the eye refractive power test are arranged.

(Alignment optical system 100)
In the alignment optical system 100, the light from the light source 101 is reflected by the hot mirror 102, passes through the objective lens 103, is reflected by the hot mirror 104, and then irradiates the cornea of the eye E to be inspected through the flat glasses 511 and 510. In this embodiment, the light source 101 is an LED that outputs infrared light.

The light reflected by the cornea is received by the lens 105 and the profile sensor 107, which are the first detection unit, and the lens 106 and the profile sensor 108, which are the second detection units, which are arranged symmetrically with respect to the main optical axis O1. It The signals obtained by the profile sensor 107 and the profile sensor 108 are processed by the controller 600 of the main body, and the XYZ drive control 630 performs XYZ alignment (fine adjustment) of the head with respect to the eye to be inspected. As will be described later, the alignment of the head portion with respect to the eye to be inspected is roughly aligned by operating the joystick 640 provided in the main body portion, where the examiner sees the bright spot by the alignment light of the anterior segment image displayed on the monitor 650, When the bright spot falls within a predetermined range, the XYZ drive control 630 controls to perform XYZ auto-alignment.

(Observation optical system 300)
The observation optical system 300 irradiates the anterior ocular segment region including the corneal part of the subject's eye with the light source 301 and the light source 302 arranged on the subject's eye side of the subject, and the objective lens 303, the imaging lens 305, and the two-dimensional imaging element. The anterior segment image of the subject's eye is acquired by the (CCD) 306, and the acquired anterior segment image of the subject's eye is displayed on the monitor 650. LEDs that output infrared light are used as the light sources 301 and 302, but light having a shorter wavelength than the light source 101 for alignment is used. Therefore, the hot mirror 104 transmits the observation light (observation light) and reflects the alignment light (alignment light, light from the light source 101). In the dichroic mirror 304, the reflection/transmission wavelength region is set so that the observation light is transmitted. As a result, the alignment light and the observation light are appropriately divided, and each measurement is possible.

(Fixing optical system 400)
The fixation optical system 400 converts the light from the light source 514 into parallel light by the collimator lens 513 and irradiates the fixation target 512 with the parallel light. The light from the fixation target passes through the hot mirror 402 and the relay lens 403, is then reflected by the mirror 404, is transmitted through the hot mirror 506, is reflected by the dichroic mirror 304, is transmitted through the main optical axis O1, and is the objective. The light passes through the lens 303, the hot mirror 104, and the flat glasses 511 and 510 to form an image on the retina of the eye to be inspected. Therefore, it is desirable that the fixation target 512 and the retina position of the eye to be inspected are substantially conjugate. The eye to be examined is fixed based on the fixation target 512. When inspecting the eye refractive power, the fixation target portion (fixation target 512, collimator lens 513, and light source 514) is once moved and controlled so that the fixation target and the retina position of the eye to be examined are substantially conjugated. The eye is fixed, and then the eye is refracted by inspecting the eye after moving a predetermined distance to form a cloudy state. Therefore, the fixation target portion can be moved back and forth along the optical axis by a signal from the control device 600. As the light source 514, an LED that outputs visible light that has a shorter wavelength than the light source 401 and that can be visually recognized by the subject is used.

(Eye refracting power optical system 500)
In the eye refractive power optical system 500, the light (reflecting light) from the light source 501 is condensed by the condensing lens 502, reflected by the mirror 503, passes through the hole at the center of the perforated mirror 504, and with respect to the optical axis O2. After being obliquely arranged and transmitted through the plane-parallel glass 505 which rotates about the optical axis O2 by a driving unit (not shown), the light is reflected by the hot mirror 506 and the dichroic mirror 304, passes through the optical axis O1, and passes through the objective lens 303 and the hot mirror. The light is transmitted through 104, the plane glass 511 and the plane glass 510 to irradiate the retina of the eye E to be examined. Then, the reflected light from the retina of the eye E is transmitted through the flat glass 510, the flat glass 511, the hot mirror 104 and the objective lens 303 and is reflected by the dichroic mirror 304 and the hot mirror 506 in the route opposite to that at the time of irradiation. After passing through the parallel plane glass 505 through the optical axis O2, the light is reflected by the perforated mirror 504, and after passing through the lens 507, the ring lens 508 forms a ring-shaped image on the two-dimensional image pickup device (CCD) 509 ( Ring image). As the light source 501, infrared light having a longer wavelength than the alignment light (light source 101) and the observation light (light sources 301 and 302) is adopted. In this embodiment, an SLD (super luminescent diode) having a wavelength of 870 nm is adopted, but the present invention is not limited to this, and an LED or a laser diode (LD) adopted for the light source 101 or the like may be adopted. ..

Here, the plane-parallel glass 505 is arranged at a position conjugate with the pupil of the eye E to be examined. When the reflex light (light from the light source 501) is incident on the parallel flat glass 505 arranged obliquely with respect to the optical axis O2, it is refracted and deviated from the optical axis O2 by a predetermined distance (for example, ΔH). As described above, since the parallel flat glass 505 rotates about the optical axis O2, the reflex light transmitted through the parallel flat glass 505 rotates at the position of the parallel flat glass 505 with a radius ΔH. Since the plane-parallel glass 505 is arranged at a position conjugate with the pupil position of the eye E to be inspected, it is rotated on the retina of the eye E to be inspected while rotating at a pupil position of the eye E with a predetermined (constant) radius (eg, Δh). Irradiate. Therefore, the reflex light is imaged on the retina of the eye E to be examined in a circular shape having a size and shape corresponding to the eye refractive power of the eye E to be examined. Since the CCD 509 is arranged at a position conjugate with the retina of the eye E to be inspected, the eye refractive power of the eye to be inspected can be obtained by analyzing the ring image acquired by the CCD 509.

(Optical system for intraocular pressure inspection)
FIG. 2 shows the entire optical system (intraocular pressure inspection optical system) during the intraocular pressure inspection of the eye to be inspected. The intraocular pressure inspection optical system includes an alignment optical system 100 including a light source 101 to profile sensors 107 and 108, an observation optical system 300 including a two-dimensional image pickup device (CCD) 306 from the light sources 301 and 302, and a light source 401 to a mirror. A fixation optical system 400 configured by 404 and a displacement deformation detection light receiving optical system 200 configured by a light source 201, a nozzle 205, and a flat glass 206 for detecting the degree of deformation of the cornea of the eye to be inspected. As shown in FIG. 1, each of the optical systems forming the intraocular pressure inspection optical system is configured such that a part thereof is shared. Then, the mouth part is rotated and the nozzle 205 for the intraocular pressure test is arranged.

Since the alignment optical system 100 and the observation optical system 300 are the same as those used in the above-described eye refractive power test, a description thereof will be omitted here. The fixation optical system 400 is partially different from that during the eye refractive power test, and will be described below.

(Fixation optical system 400: intraocular pressure test)
When inspecting the intraocular pressure, the light source 514 used in the eye refractive power test is turned off and the light source 401, which is another light source, is turned on. Light (fixation light) from the light source 401 is reflected by the hot mirror 402, passes through the relay lens 403, is reflected by the reflection mirror 404, is transmitted through the hot mirror 506, is reflected by the dichroic mirror 304, and is reflected by the main optical axis O1. Through the objective lens 303 and the hot mirror 104 to form an image on the retina of the eye E to be inspected. The eye E to be inspected is fixed on the basis of the fixation light, and an eye characteristic inspection such as an intraocular pressure inspection becomes possible. As the light source 401, an LED that outputs visible light that can be visually recognized by the subject is adopted.

(Displacement deformation detection light receiving optical system 200)
In the displacement deformation detection light receiving optical system 200, a part of the light (deformation detection light) from the light source 201 is transmitted through the half mirror 202, is transmitted through the hot mirror 102 and the objective lens 103, is reflected by the hot mirror 104, and is reflected by the main light. The cornea of the eye to be inspected is irradiated through the axis O1 and the flat glass 206 and the opening of the nozzle 205. The light radiated to the cornea is reflected by the cornea, passes through the opening of the nozzle 205 and the flat glass 206 in the reverse path, is reflected by the hot mirror 104, passes through the objective lens 103 and the hot mirror 102, and a part thereof is reflected. The light is reflected by the half mirror 202 and received by the light receiving element 204 by the condenser lens 203. As described later, during the intraocular pressure test, compressed air is ejected from the nozzle 205 toward the cornea of the eye to be inspected. When air is jetted, the cornea is displaced and deformed, so that the amount of light received by the light receiving element 204 changes. The intraocular pressure value of the subject's eye is calculated from the degree of change in the light amount. An LED that outputs infrared light is also used as the light source 201, but light having a longer wavelength than the observation light and a shorter wavelength than the alignment light is selected and used. In this way, the wavelengths of the alignment light, the observation light, the fixation light, and the deformation detection light (light from the light source 201) are set, and the reflection/transmission characteristics of the hot mirrors 102, 104, 506, 402 and the dichroic mirror 304 are appropriately set. By setting, these four lights are configured to travel along appropriate optical paths.

(Operation flow)
FIG. 4 is a diagram illustrating an operation flow of the ophthalmologic apparatus according to the present embodiment. In this embodiment, the first examination is an eye refractive power examination and the second examination is an intraocular pressure examination.

In S10, in order to carry out the eye refractive power test, which is the first test, the facing part is rotated and flat glasses 510 and 511 are arranged as shown in FIG. If the mouth part is already in the state of the eye refractive power test, S10 is omitted.

In S12, the eye refractive power test, which is the first test, is started. Although not described in the operation flow, the observation light sources 301 and 302, the alignment light source 101, the fixation target light source 514, and the eye refractive power test light source 501 are turned on at this time.

In S14, the joystick 640 is used to move the head unit so that the right eye of the patient is displayed on the monitor 650. Then, the head portion is roughly aligned in the XYZ directions so that the bright spot on the cornea due to the alignment light enters a predetermined area.

In S16, the fixation target 512 is used for fixation. In the case of the eye refractive power test, the eye refractive power is also measured at this time, and the fixation target 512 is fixed based on the obtained value of the eye refractive power so that the fixation target 512 is in a position conjugate with the retina of the eye E to be examined. The standard part (512-514) is moved. As a result, the eye E to be examined is fixed.

In S18, the alignment state is detected from the signals obtained by the profile sensor 107 and the profile sensor 108, and the XYZ drive control 630 inside the main body executes the XYZ alignment of the head portion from the detection result.

When the XYZ alignment is completed, the measurement is started in S20. In the case of the eye refractive power test, in order to open the eye to be inspected, the fixation target part (512 to 514) is moved along the optical axis for a predetermined distance to make the cloud state, and then the eye refractive power is measured. To do.

In S22, the measured value is stored in the memory 670.

In S24, it is determined whether the measurement has been completed for both the left and right eyes. In the case of only the right eye, the head unit is moved to the left eye side in S28, the eye refractive power of the left eye is measured in S18 to S22 similarly to the right eye, and the measured value is stored in the memory 670.

When the measurement is completed for both the left and right eyes, it is determined in S26 whether the intraocular pressure test, which is the second test, is completed.

When the intraocular pressure test of the second test is not completed, the mouth part is rotated so that the nozzle 205 and the flat glass 206 are arranged as shown in FIG. 2 in S30. Then, in S32, the intraocular pressure test, which is the second test, is started. Here, although not described in the operation flow, the fixation light source 514 for the eye refractive power test is turned off, and the fixation light source 401 is turned on instead.

In S14, similarly to the eye refractive power test, the head part is moved using the joystick 640 so that the right eye of the patient is displayed on the monitor 650. Then, the head portion is roughly aligned in the XYZ directions so that the bright spot on the cornea due to the alignment light enters a predetermined area.

In S16, the eye E to be examined is fixed by a fixation lamp from the light source 401. Using the result of the eye refractive power test of the first test, the light source 401 is moved so as to be at a position substantially conjugate with the retina position of the eye E to be inspected. This allows the fixation lamp to be placed at a position in focus with respect to the patient.

In S18, similarly to the eye refractive power test, the alignment state is detected from the signals obtained by the profile sensor 107 and the profile sensor 108, and the XYZ drive control 630 inside the main body performs XYZ alignment of the head unit from the detection result.

When the XYZ alignment is completed, the measurement is started in S20. As described above, the cornea of the eye E is irradiated with the light from the light source 201, and the reflected light is received by the light receiving element 204. Then, although not shown, the piston in the cylinder of the opening portion is driven, and the air compressed in the cylinder flows into the air passage of the opening portion through the pipe, and the cornea of the eye E to be inspected from the nozzle 205. Squirt toward. Since the cornea is displaced and deformed by the jetted air, the amount of light received by the light receiving element 204 changes (the cornea is flattened by the jetting of air, so the amount of light received by the light receiving element 204 increases). The time until the light receiving signal obtained by the light receiving element 204 reaches a predetermined value is measured, and the measured value is stored in the memory 670 in S22. Since the intraocular pressure value has a correlation with the time from when air is ejected until the light receiving signal reaches a predetermined value, the intraocular pressure value of the eye E can be calculated from the stored measured value (time).

Then, in S24, similarly to the eye refractive power test, it is determined whether the measurement has been completed for both the left and right eyes. In the case of only the right eye, the head unit is moved to the left eye side in S28, the intraocular pressure test of the left eye is performed in S18 to S22 similarly to the right eye, and the result is stored in the memory 670.

When the measurement is completed for both the left and right eyes, it is determined in S26 whether the intraocular pressure test, which is the second test, has been completed. When the intraocular pressure test, which is the second test, is completed, the measurement ends.

It is not always necessary to perform both the first inspection and the second inspection, and only one inspection may be performed. For patients whose eye refractive power test results are known in advance, do not perform the first eye refractive power test and enter the eye refractive power value during the second eye pressure test. Therefore, the light source 401 may be moved. Furthermore, in the present embodiment, the examination is performed from the right eye, but this may also be performed from the left eye, or only one eye may be examined.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific description of the embodiment, and various modifications may be made without departing from the spirit of the present invention. It is possible.

In the above-described embodiment, when the fixation is performed in S16 in the intraocular pressure test which is the second test, the light source 401 is substantially conjugate with the retina position of the eye E to be examined by using the result of the eye refractive power test which is the first test. Although the configuration for moving the light source 401 has been disclosed, the light source 401 may be moved at the same time when the fixation target parts (512 to 514) are moved in the eye refractive power test which is the first test. Specifically, as shown in FIG. 5, the light source 401, the hot mirror 402, the fixation target 512, the collimator lens 513, and the light source 514 are integrated into one body when performing fixation in the eye refractive power test that is the first test. Are collectively controlled for movement. As a result, the light source 401 is already in a substantially conjugate position with the retina position of the eye E to be inspected at the time of the first examination, and it is not necessary to move the light source 401 again at the time of the second examination.

Further, in the above-described embodiment, the configuration in which the intraocular pressure test is performed in the second test is disclosed, but the second test is not limited to this. For example, it may be a corneal shape inspection or a corneal endothelial cell inspection.

100・・Alignment optical system, 200・・Displacement deformation detection light receiving optical system, 300・・Observation optical system, 400・・Fixation optical system, 500・・Eye refraction optical system, 600・・Control device, 630・・XYZ drive control, 650... Monitor

Claims (4)

An ophthalmic device for inspecting at least two eye characteristics, including an eye refractive power test, comprising:
Has a fixation target for presentation to the eye during eye refractive power test,
A fixation light different from a light source for illuminating the fixation target,
The fixation lamp is arranged on an optical path branched between the eye to be inspected and the fixation target,
In the case of inspecting eye characteristics different from the eye refractive power test, the fixation lamp is moved based on the eye refractive power test result,
Sharing a part of the fixation optical system used for the eye refractive power test with the fixation lamp ,
An ophthalmologic apparatus having a configuration in which the fixation lamp and an optotype used for an eye refractive power test are simultaneously moved . The ophthalmologic apparatus according to claim 1 , wherein, of the ophthalmologic apparatuses that inspect the two eye characteristics, the eye characteristic tests other than the eye refractive power test are intraocular pressure tests. The ophthalmic apparatus according to claim 1 , wherein among the ophthalmic apparatuses that inspect the two eye characteristics, an eye characteristic test other than an eye refractive power test is a corneal shape test. The ophthalmologic apparatus according to claim 1 , wherein among the ophthalmic apparatuses that inspect the two eye characteristics, an eye characteristic test other than an eye refractive power test is a corneal endothelial cell test.