JP6895780B2 - Ophthalmic device and its control method - Google Patents

Description

The present invention relates to an ophthalmic apparatus and a method for controlling the same.

An ophthalmic device is a device used in the field of ophthalmology and is used to acquire data of an eye to be inspected. Examples of the ophthalmic device include a device for measuring the characteristics of the eye to be inspected and a device for taking an image of the eye to be inspected.

The target of examination (measurement, photography, etc.) is often the eye with a disease or abnormality (sick eye). There are some types of sick eyes that reduce the reliability of measurement and imaging and hinder smooth execution. Typical types include cataract eyes and eyes with an intraocular lens implanted (IOL eyes).

An intraocular lens (IOL) is an optical element that is inserted into the eye for the treatment of cataracts and refractive errors. In the treatment of cataracts, the opaque crystalline lens is replaced by an intraocular lens. In the treatment of refractive error (myopia, hyperopia, astigmatism), a phakic intraocular lens (fake IOL) is implanted between the lens and the cornea.

Specific problems may arise when performing an IOL eye examination. Typically, noise light due to reflections from the intraocular lens can adversely affect the examination. In particular, when an intraocular lens made of a material having a relatively high refractive index such as polymethylmethacrylate (PMMA) projects light onto the fundus of the implanted eye, the adverse effect becomes remarkable. Such tests include refractive power measurement, wavefront aberration measurement, axial length measurement, fundus photography, optical coherence tomography (OCT) of the fundus, and the like.

The surface of the cornea has the highest reflectance in the eye to be inspected. Regarding the surface reflection of the cornea, the reflected light can be released to the outside of the effective diameter of the optical system by slightly deviating the projection position of the luminous flux from the apex of the cornea by utilizing the fact that the radius of curvature of the cornea is relatively small. This method is not effective for reflection with an intraocular lens having a relatively large radius of curvature. In addition, the optical axis of the intraocular lens does not always coincide with the axis of the eye to be inspected, and their positional relationship differs for each eye to be inspected. Therefore, it is not possible to avoid the influence of reflection by the intraocular lens by a uniform method. difficult.

Patent Document 1 discloses an ophthalmic apparatus that obtains an optical power from a photographed image (measured image) of an index projected on the fundus. This ophthalmic apparatus is configured to display a measurement image when a measurement error occurs due to the influence of an intraocular lens or cataract.

JP-A-2007-89715

However, since the ophthalmic apparatus disclosed in Patent Document 1 displays a measurement image after the measurement is completed, if a measurement error occurs, the measurement must be performed again, and the subject and the examiner must perform the measurement again. Both are burdensome. Further, since Patent Document 1 does not disclose a specific means for avoiding a measurement error, it can be said that there is a high possibility that the same result will be obtained even if the measurement is performed again.

An object of the present invention is to provide a technique for suitably performing an examination of an IOL eye or the like.

The first aspect of the embodiment is an ophthalmologic apparatus for optically inspecting the eye to be inspected, which is an optical system that projects a light beam toward the fundus of the eye to be inspected and detects the return light as a pattern image. , The presence or absence of ghost is determined by analyzing the alignment system for aligning the optical system with respect to the eye to be inspected and the pattern image detected by the optical system when the alignment is performed by the alignment system. Includes a determination unit to be used.

In the second aspect of the embodiment, the determination unit includes a first determination unit that determines whether the brightness of the pattern image detected by the optical system satisfies a predetermined condition.

In the third aspect of the embodiment, the determination unit determines a calculation unit that analyzes the pattern image detected by the optical system to obtain a refractive power value, and a calculation unit that obtains the refractive power value obtained by the calculation unit. Includes a second determination unit that determines whether the value is equal to or greater than the threshold value.

In the fourth aspect of the embodiment, the determination unit analyzes the pattern image detected by the optical system when the optical examination of the eye to be inspected is performed after the alignment, and the ghost Determine the presence or absence.

A fifth aspect of the embodiment includes a notification control unit that notifies that the determination unit has determined that the pattern image contains a ghost.

In the sixth aspect of the embodiment, the alignment system includes an alignment data acquisition unit for acquiring data for performing the alignment and a motor, and moves the optical system based on the driving force generated by the motor. It includes a movement mechanism and a movement control unit that controls the motor based on the data acquired by the alignment data acquisition unit.

In the seventh aspect of the embodiment, the movement control unit is acquired by the alignment data acquisition unit after executing the first control for controlling the motor based on the data acquired by the alignment data acquisition unit. The second control for controlling the motor is executed based on the data and the pattern image detected by the optical system.

In the eighth aspect of the embodiment, the optical system includes an optical element that generates pattern light from the return light and an image sensor that detects the pattern light as the pattern image.

In the ninth aspect of the embodiment, the optical system repeatedly detects the pattern image, and the determination unit determines the presence or absence of the ghost according to the repetition of the detection of the pattern image by the optical system. Is iteratively executed.

A tenth aspect of the embodiment is a display control unit that causes a display means to display predetermined information for the alignment and a pattern image detected by the optical system when the alignment is performed. Including.

The eleventh aspect of the embodiment is a method for controlling an ophthalmologic apparatus for optically inspecting an eye to be inspected, wherein the step of aligning the ophthalmologic apparatus with respect to the eye to be inspected and the alignment are being performed. In addition, a step of projecting a luminous flux toward the fundus of the eye to be inspected and detecting the return light as a pattern image, and when the alignment is performed, the pattern image is analyzed to determine the presence or absence of ghosts. Including steps.

The above-mentioned apparatus and method are exemplary embodiments of the present invention. The device according to the embodiment may be any combination of the above-mentioned components. Similarly, the method according to the embodiment may be any combination of the above-mentioned components. Further, the embodiment may be a system, a computer program, or a recording medium including any combination of the above-mentioned components.

According to the embodiment, an examination of an IOL eye or the like can be preferably performed.

It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic for demonstrating the example of the measurement performed by the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 1st Embodiment. It is a flowchart which shows the example of the operation of the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic for demonstrating the example of the information displayed by the ophthalmic apparatus which concerns on 1st Embodiment. It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 2nd Embodiment. It is the schematic which shows the example of the structure of the ophthalmic apparatus which concerns on 3rd Embodiment. It is a flowchart which shows the example of the operation of the ophthalmic apparatus which concerns on 3rd Embodiment.

An exemplary embodiment of the present invention will be described in detail with reference to the drawings. It should be noted that any known technique including the technique disclosed in the literature cited in this specification can be incorporated into the following embodiments.

The ophthalmic apparatus according to the embodiment is capable of performing at least one of any subjective tests and any objective measurements. In the subjective test, information (such as a target) is presented to the subject, and data on the eye to be examined is requested based on the response of the subject to the information. The subjective test includes a distance test, a near test, a contrast test, a glare test, and other subjective refraction measurements, and a visual field test. In objective measurement, light is projected onto the eye to be inspected, and information on the eye to be inspected is acquired based on the detection result of the return light. Objective measurement includes measurement for acquiring the characteristics of the eye to be inspected and photographing for acquiring an image of the eye to be inspected. Objective measurement includes objective refraction measurement, corneal shape measurement, intraocular pressure measurement, fundus photography, tomography using OCT (OCT photography), measurement using OCT, and the like.

Hereinafter, the ophthalmic apparatus according to the embodiment can perform a distance examination, a near-distance examination, etc. as a subjective examination, and also performs an objective refraction measurement, a corneal shape measurement, etc. by wavefront aberration measurement as an objective measurement. It shall be a possible device. However, the configuration of the ophthalmic apparatus according to the embodiment is not limited to this.

<First Embodiment>
The ophthalmic apparatus according to the embodiment includes a face receiving portion fixed to the base and a pedestal that can be moved back and forth, up, down, left and right with respect to the base. The gantry is provided with a head portion in which an optical system for inspecting (measuring) the eye to be inspected is housed. By performing an operation on the operation unit arranged at the position on the examiner's side, the face receiving portion and the head portion can be relatively moved. In addition, the ophthalmic apparatus can automatically move the face receiving portion and the head portion relative to each other by performing the alignment described later.

<Constitution>
FIG. 1 shows a configuration example of the ophthalmic apparatus according to the embodiment. The ophthalmic apparatus includes a Z alignment system 1, an XY alignment system 2, a plated index projection system 3, an optotype projection system 4, an observation system 5, an aberration measurement projection system 6, and an optical system for inspecting the eye E to be inspected. The aberration measurement light receiving system 7 is included. In addition, the ophthalmic apparatus includes a processing unit 9. The reference numeral K indicates the cornea, the reference numeral Ec indicates the crystalline lens or the intraocular lens, and the reference numeral Ef indicates the fundus.

(Processing unit 9)
The processing unit 9 controls each unit of the ophthalmic apparatus. In addition, the processing unit 9 can execute various arithmetic processes. The processing unit 9 includes a processor. The functions of the processor include, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), an ASIC (Application Specific Integrated Circuit), a programmable logic device (for example, a SPLD (Simple Programming Unit), a programmable logic device (for example, a SPLD) , FPGA (Field Processor Gate Array)) and the like. The processing unit 9 realizes the function according to the embodiment by reading and executing a program stored in a storage circuit or a storage device, for example.

(Observation system 5)
The observation system 5 captures a moving image of the anterior segment of the eye E to be inspected. The observation system 5 may include an illumination light source for illuminating the anterior segment of the eye.

The light from the anterior segment of the eye E to be inspected (for example, infrared light) passes through the objective lens 51, passes through the dichroic mirror 52, and passes through the aperture of the aperture 53. The light that has passed through the aperture 53 passes through the half mirror 22, passes through the relay lens 54, and is guided to the imaging lens 55. The imaging lens 55 forms an image of the anterior segment of the eye guided by the relay lens 54 on the light receiving surface of the area sensor 56. The light receiving surface of the area sensor 56 is arranged at a position substantially conjugate with the pupil of the eye E to be inspected. The area sensor 56 performs imaging and signal output at a predetermined rate.

The output (video signal) of the area sensor 56 is input to the processing unit 9. The processing unit 9 displays the anterior segment image E'based on this video signal on the display screen 10a of the display device 10. The anterior segment image E'is, for example, an infrared moving image.

(Z alignment system 1)
The Z alignment system 1 projects light (infrared light) for alignment in the optical axis direction (front-back direction, Z direction) of the observation system 5 onto the eye E to be inspected. The light output from the Z alignment light source 11 is projected onto the cornea K, reflected by the cornea K, and guided to the imaging lens 12. The imaging lens 12 forms an image of the guided light on the light receiving surface of the line sensor 13. When the position of the corneal apex changes in the anteroposterior direction, the projected position of light on the line sensor 13 changes. The output of the line sensor 13 is input to the processing unit 9.

When performing Z alignment automatically, the processing unit 9 moves the optical system so that the corneal reflected light is projected onto a specific light receiving element (for example, a light receiving element located in the center of the line arrangement) of the line sensor 13. Control the mechanism for.

When manually performing Z alignment, the processing unit 9 displays information based on the projection position of light on the line sensor 13 on the display screen 10a. This information will be described later. The examiner operates the optical system while referring to this information.

(XY alignment system 2)
The XY alignment system 2 emits light (infrared light) for aligning in a direction orthogonal to the optical axis of the observation system 5 (horizontal direction (horizontal direction, X direction), vertical direction (Y direction)). Project to.

The XY alignment system 2 includes an XY alignment light source 21 provided in an optical path branched from the observation system 5 by a half mirror 22. The light output from the XY alignment light source 21 passes through the relay lens 23 and is reflected by the half mirror 22. The light reflected by the half mirror 22 is focused at the front focal position of the objective lens 51 on the optical axis of the observation system 5, then passes through the dichroic mirror 52, becomes parallel light by the objective lens 51, and is converted into parallel light by the objective lens 51. Projected to.

The light reflected on the surface of the cornea K forms a Purkinje image near the reflection focal position on the surface of the cornea K. The XY alignment light source 21 is arranged at a position optically conjugate with the focal position of the objective lens 51. The reflected light from the cornea K is guided to the area sensor 56 through the observation system 5. An image Br of the Purkinje image (bright spot) of the light output from the XY alignment light source 21 is formed on the light receiving surface of the area sensor 56.

As shown in FIG. 1, the processing unit 9 displays the bright spot image Br, the anterior segment image E', and the alignment mark AL on the display screen 10a. When manually performing XY alignment, the examiner moves the optical system so as to guide the bright spot image Br in the alignment mark AL. When the alignment is performed automatically, the processing unit 9 controls a mechanism for moving the optical system so as to cancel the deviation of the bright spot image Br with respect to the alignment mark AL.

(Purachido index projection system 3)
The purachido index projection system 3 projects a plurality of concentric ring-shaped luminous fluxes (infrared light) on the cornea K for measuring the shape of the cornea K. The purachido index projection system 3 includes a purachido plate 31 and a purachido light source 32.

The purachido plate 31 is arranged in the vicinity of the objective lens 51. A plurality of concentric light-transmitting portions (ring patterns) are formed on the purachido plate 31. A purachido light source 32 is provided on the back side (objective lens 51 side) of the purachido plate 31. The purachido light source 32 includes, for example, a plurality of light emitting diodes (LEDs).

By illuminating the purachido plate 31 with the light from the purachido light source 32, a plurality of concentric ring-shaped luminous fluxes are projected on the cornea K. The reflected light (platidling image) is detected by the area sensor 56 together with the anterior segment image. The processing unit 9 calculates the corneal shape parameter by performing a known calculation based on the detected placid ring image. A kerato plate may be arranged instead of the purachido plate.

(Optimal projection system 4)
The optotype projection system 4 presents various optotypes such as a fixation target and a target for subjective examination to the eye E to be inspected. The optotype chart 42 receives control from the processing unit 9 and displays a pattern representing the optotype. The light (visible light) output from the light source 41 illuminates the optotype chart 42 from the back. The light that has passed through the optotype chart 42 passes through the relay lens 43 and the field lens 44, is reflected by the reflection mirror 45, is transmitted through the dichroic mirror 68, and is reflected by the dichroic mirror 52. The light reflected by the dichroic mirror 52 passes through the objective lens 51 and is projected onto the fundus Ef. As a result, the optotype image of the pattern presented on the optotype chart 42 is projected on the fundus Ef.

The moving unit 46 includes a light source 41 and an optotype chart 42. The moving unit 46 can move along the optical axis of the optotype projection system 4. The position of the moving unit 46 is adjusted so that the optotype chart 42 is arranged at a position optically conjugate with the fundus Ef.

The optotype chart 42 is controlled by the processing unit 9 and can display a pattern representing the fixation target for fixing the eye E to be inspected. The fixation position can be changed by changing the display position of the fixation target pattern on the optotype chart 42. Thereby, the line of sight and adjustment of the eye E to be inspected can be guided.

In the optotype chart 42, for example, a plurality of optotypes drawn on an electronic display device using a liquid crystal panel, electroluminescence (EL), or a rotating glass plate can be selectively arranged on the optical axis. It is a turret type optical member.

The optotype projection system 4 may include a glare inspection optical system for projecting glare light onto the eye E to be inspected together with the above-mentioned optotype.

When performing the subjective test, the processing unit 9 controls the mobile unit 46 based on the result of the objective measurement performed in advance. The processing unit 9 displays the optotype selected by the examiner or the processing unit 9 on the optotype chart 42. As a result, the target is presented to the subject. The subject responds to the optotype. Upon receiving the input of the response content, the processing unit 9 further controls and calculates the subjective test value. For example, in the visual acuity measurement, the processing unit 9 selects and presents the next visual target based on the response to the Randold ring or the like, and repeatedly repeats this to determine the subjective refractive power value.

In objective measurement (objective refraction measurement, etc.), a landscape chart is projected on the fundus Ef. Alignment is performed while the subject is staring at the landscape chart, and the refractive power of the eye is measured in a cloud-fog state.

(Aberration measurement projection system 6, aberration measurement light receiving system 7)
The aberration measurement projection system 6 and the aberration measurement light receiving system 7 are used for measuring the eyeball aberration characteristics of the eye E to be inspected. The aberration measurement projection system 6 projects a luminous flux (infrared light) for measuring eyeball aberration characteristics toward the fundus Ef. The aberration measurement light receiving system 7 receives the return light of the luminous flux projected by the aberration measurement projection system 6 from the eye E to be inspected. Aberration measurement From the light receiving result obtained by the light receiving system 7, the eyeball aberration characteristic of the eye E to be inspected can be obtained.

The light source 61 is, for example, a point light source that emits light having a wavelength in the vicinity of 850 nm. As the light source 61, for example, a superluminescent diode (SLD), a laser diode (LD), or an LED having a small light emitting diameter is used.

The moving unit 69 includes a light source 61. The moving unit 69 can move along the optical axis of the aberration measurement projection system 6. The light source 61 is arranged at a position substantially conjugate with the fundus Ef.

The light (measurement light) output from the light source 61 passes through the relay lens 62 and the field lens 63 and passes through the polarizing plate 64. The polarizing plate 64 transmits, for example, only the p-polarized light component among the polarized light components of the measurement light. The measurement light transmitted through the polarizing plate 64 passes through the opening of the aperture 65, is reflected by the polarization beam splitter 66 that reflects the p-polarizing component, passes through the rotary prism 67, and is reflected by the dichroic mirror 68. The measurement light reflected by the dichroic mirror 68 is reflected by the dichroic mirror 52, passes through the objective lens 51, and is projected onto the fundus Ef.

The rotary prism 67 is used to average the unevenness of the reflectance in the blood vessels of the fundus Ef and the diseased part, and to reduce the speckle noise due to SLD or the like.

Instead of arranging the light source device at the position of the light source 61, a configuration may be adopted in which the light from the light source device provided outside is introduced into the ophthalmic device by an optical fiber. In this case, the end face (emission end) of the optical fiber on the ophthalmic apparatus side is arranged at a position substantially conjugate with the fundus Ef.

In general, the polarization state of the measurement light that is contained only in the p-polarized component by the polarizing plate 64 and is incident on the eye E to be inspected is changed by scattering / reflection at the fundus Ef. Therefore, the return light from the eye E to be inspected is a mixture of the p-polarized light component and the s-polarized light component. Such return light passes through the objective lens 51, is reflected by the dichroic mirrors 52 and 68, passes through the rotary prism 67, and is guided to the polarization beam splitter 66. The polarization beam splitter 66 transmits only the s polarization component of the polarization components of the return light. The s-polarizing component transmitted through the polarizing beam splitter 66 passes through the field lens 71, is reflected by the reflection mirror 72, passes through the relay lens 73, and is guided to the moving unit 77.

Here, the light that is specularly reflected by the objective lens 51 and the cornea K maintains the p-polarized light component. Since such specularly reflected light is reflected by the polarizing beam splitter 66, it does not enter the aberration measurement light receiving system 7. Thereby, the occurrence of ghost can be reduced.

The moving unit 77 includes a collimator lens 74, a Hartmann plate 75, and an area sensor 76. As the area sensor 76, for example, a Charge Coupled Device (CCD) image sensor or a CMOS (Complementary Metal Oxide Sensor) image sensor is used.

The moving unit 77 can move along the optical axis of the aberration measurement light receiving system 7. In the moving unit 77, the Hartmann plate 75 is arranged at a position optically substantially conjugate with the pupil of the eye E to be inspected, and the anterior focal position of the collimator lens 74 is optically substantially substantially with respect to the fundus Ef. It is moved along the optical axis according to the optical power value of the eye E to be inspected so as to be arranged at a conjugate position.

The light guided by the moving unit 77 passes through the collimator lens 74 and is incident on the Hartmann plate 75.

An example of the Hartmann plate 75 is shown in FIGS. 2A and 2B. The Hartmann plate 75 is an optical element for detecting the return light from the eye E to be inspected as a pattern image, and functions to generate a plurality of focused lights from the return light. The Hartmann plate 75 includes a plurality of two-dimensionally arranged microlenses 75A (microlens arrays). The plurality of microlenses 75A are arranged in a grid pattern, for example. The light incident on each microlens 75A is refracted and emitted as focused light.

The Hartmann plate 75 shown in FIG. 2A includes a plurality of microlenses 75A formed on the glass plate by etching, molding, or the like. According to such a Hartmann plate 75, there is an advantage that the aperture of each microlens 75A can be made large and the signal strength can be increased.

On the other hand, in the Hartmann plate 75 shown in FIG. 2B, a light-shielding portion 75B is formed around the microlens 75A by a chromium light-shielding film or the like. The plurality of microlenses 75A in this example are arranged in a grid pattern, a concentric pattern, or another pattern, for example.

The light receiving surface of the area sensor 76 is arranged on the focal planes of the plurality of microlenses 75A. The area sensor 76 detects a plurality of focused lights generated by the Hartmann plate 75.

As shown in FIG. 3, on the light receiving surface of the area sensor 76, a plurality of point images A ₁ , ..., B ₁ , ..., Corresponding to a plurality of focused lights generated by the plurality of microlenses 75A. C ₁ , ... Are formed. The plurality of point images A ₁ , ..., B ₁ , ..., C ₁ , ... Are the projection regions of the measurement light in the pupil Ep of the eye E to be inspected a ₁ , ..., b ₁ , ...・, C ₁ , ... Corresponds.

When the fundus Ef and the anterior focal position of the collimator lens 74 are optically coupled to each other as described above, a plurality of point images A ₁ , ..., B ₁ , ..., C ₁ , ... The distance between the positions of the centers of gravity is substantially equal to the distance between the centers (distance between optical axes) of the plurality of microlenses 75A.

In this way, the area sensor 76 detects the point image group formed by the Hartmann plate 75. The processing unit 9 acquires the detection signal from the area sensor 76 that has detected the point image group and the position information indicating the detection position of the point image group. The processing unit 9 obtains the wavefront aberration of the light projected on the Hartmann plate 75 by analyzing the position of the point image group. Generally, the eyeball aberration characteristic (wavefront aberration characteristic) of the eye E to be inspected can be obtained by approximating to the Zernike polynomial. The processing unit 9 can obtain the optical power value of the eye E to be inspected from the obtained eye aberration characteristics.

Based on the calculated optical power value, the processing unit 9 sets the moving unit 69 and the moving unit 77 so that the light source 61, the fundus Ef, and the anterior focal position of the collimator lens 74 are optically coupled to each other. It can be moved in the optical axis direction. Further, the processing unit 9 can move the moving unit 46 in the optical axis direction in conjunction with the movement of the moving unit 69 and the moving unit 77. Further, any two of the moving unit 69, the moving unit 77, and the moving unit 46 may be integrally configured, and these three moving units may be moved by the two drive mechanisms. Alternatively, the moving unit 69, the moving unit 77, and the moving unit 46 may be integrally configured, and these three moving units may be moved by a single drive mechanism.

(Processing system configuration)
The processing system of the ophthalmic apparatus according to the embodiment will be described. An example of the functional configuration of the processing system of the ophthalmic apparatus is shown in FIG.

The head unit 200 is provided with various optical systems such as a Z alignment system 1, an XY alignment system 2, a purachido index projection system 3, an optotype projection system 4, an observation system 5, an aberration measurement projection system 6, and an aberration measurement light receiving system 7. Has been done. Further, the head portion 200 is provided with elements (mechanism, electric circuit, etc.) that are responsible for the operation and movement of the optical member and the optical element. The operation of the optical system provided in the head unit 200 and the operation of the elements associated therewith are controlled by the control unit 100.

The moving mechanism 210 moves the head portion 200 three-dimensionally. The moving mechanism 210 moves the above-mentioned gantry back and forth, up, down, left and right. The moving mechanism 210 is driven, for example, electrically or non-electrically.

In the case of electrical drive, the moving mechanism 210 includes a motor and a mechanism for moving the head portion 200 based on the driving force generated by the motor. Further, the operation of the moving mechanism 210 is controlled by the control unit 100.

In the case of non-electrical drive, the moving mechanism 210 includes a mechanism for moving the head portion 200 by transmitting a force applied by the examiner to the operating lever or the like. In this case, the moving mechanism 210 does not have to include a motor.

The moving mechanism 210 may include, for example, a sensor that detects the position of the head portion 200 or a sensor that detects the state of the moving mechanism 210. The output from the sensor is sent to the control unit 100.

The control unit 100, the data processing unit 300, and the communication unit 500 are provided in, for example, the processing unit 9. The user interface unit 400 is provided, for example, in the processing unit 9, the housing of the ophthalmic apparatus, or the like. Alternatively, the user interface unit 400 may include a device connected to the main body of the ophthalmic apparatus.

(Control unit 100)
The control unit 100 includes a processor that controls each part of the ophthalmic apparatus. The control unit 100 includes a display control unit 101, a notification control unit 102, and a storage unit 110.

A computer program for controlling the ophthalmic apparatus is stored in the storage unit 110 in advance. The computer program includes an optical system control program, a user interface control program, and the like. The control unit 100 executes various controls according to such a computer program.

The control for the Z alignment system 1 includes the control of the Z alignment light source 11, the control of the line sensor 13, and the like. The control for the XY alignment system 2 includes the control of the XY alignment light source 21 and the like. The control for the purachido index projection system 3 includes the control of the purachido light source 32 and the like. The control for the optotype projection system 4 includes a control of the light source 41, a control of the optotype chart 42, a movement control of the moving unit 46, and the like. The control for the observation system 5 includes the control of the area sensor 56, the control of the anterior segment illumination light source (not shown), and the like. The control for the aberration measurement projection system 6 includes the control of the light source 61, the control of the rotary prism 67, the control of the moving unit 69, and the like. The control for the aberration measurement light receiving system 7 includes the control of the area sensor 76, the movement control of the moving unit 77, and the like.

(Display control unit 101)
The display control unit 101 causes the display unit 410 of the user interface unit 400 to display various information. The information displayed on the display unit 410 includes information acquired by the ophthalmic apparatus and information acquired from the outside. Examples of the information acquired by the ophthalmic apparatus include objective measurement data, images and information based on the objective measurement data, subjective examination data, and images and information based on the objective measurement data.

Although the details will be described later, the display control unit 101 may display the alignment information and the point image group (pattern image) detected by the aberration measurement projection system 6 and the aberration measurement light receiving system 7 on the display unit 410. it can.

(Notification control unit 102)
The notification control unit 102 controls to notify predetermined information. For example, the notification control unit 102 can perform notification when the pattern image contains ghosts (flare, noise light).

The mode of notification is arbitrary. In general, notification includes information output, and examples thereof include display output, audio output, print output, and information incidental.

When performing display output, the notification control unit 102 causes the display unit 410 and / or an external display device to display predetermined visual information. When only the display output is adopted, the notification control unit 102 may be integrated with the display control unit 101.

When performing voice output, the notification control unit 102 causes a voice output device (not shown) to output predetermined auditory information.

When printing out, the notification control unit 102 causes a printing device (not shown) to output predetermined visual information.

When attaching information, the notification control unit 102 attaches predetermined visual information (and auditory information) to predetermined medical data such as electronic medical record data, measurement data, image data, and analysis data. Information attachment is performed in a manner that conforms to the medical data format and communication protocol. For example, the notification control unit 102 attaches information to medical data according to the format of an electronic medical record system, the format of an image communication standard (DICOM, etc.), and the like.

(Data processing unit 300)
The data processing unit 300 includes a processor that executes various data processing. The data processing unit 300 operates according to a computer program stored in the storage unit 110, a computer program stored in the storage device in the data processing unit 300, a computer program provided from the outside, and the like.

The data processing unit 300 can process the data acquired by the optical system to generate inspection data (measurement data, image data, analysis data, etc.).

For example, the data processing unit 300 can obtain the projected position of light on the line sensor 13 by processing the signal output from the line sensor 13 of the Z alignment system 1. Further, the data processing unit 300 can obtain the control content (movement direction and movement amount in the Z direction) of the movement mechanism 210 based on the obtained projection position. The control unit 100 can perform Z alignment by controlling the moving mechanism 210 based on the control content obtained by the data processing unit 300.

Further, the data processing unit 300 can obtain the position of the bright spot image Br based on the XY alignment system 2 by processing the video signal output from the area sensor 56 of the observation system 5 (see FIG. 1). .. Further, the data processing unit 300 obtains the control contents of the moving mechanism 210 (moving direction and moving amount in the X direction, and moving direction and moving amount in the Y direction) based on the obtained position of the bright spot image Br. be able to. The control unit 100 can perform XY alignment by controlling the moving mechanism 210 based on the control content obtained by the data processing unit 300.

Further, the data processing unit 300 can detect the purachido ring image based on the purachido index projection system 3 by processing the video signal output from the area sensor 56. Further, the data processing unit 300 can obtain the corneal shape parameter of the eye E to be inspected by applying a known arithmetic process to the detected placid ring image.

Further, the data processing unit 300 can obtain the eyeball aberration characteristics of the eye E to be inspected by applying a known arithmetic processing to the signal output from the area sensor 76 of the aberration measurement light receiving system 7.

The data processing unit 300 includes a determination unit 310. The determination unit 310 analyzes the pattern image (point image group) detected by the aberration measurement projection system 6 and the aberration measurement light receiving system 7 to determine the presence or absence of ghosts.

The determination of the presence or absence of ghosts may include, for example, at least one of a determination of presence / absence of ghosts in the pattern image and a determination of whether or not ghosts equal to or greater than the threshold value are present in the pattern image. The former is a determination of whether or not noise light (ghost) caused by an intraocular lens or the like is mixed in the pattern image. On the other hand, the latter is a determination based on how much noise light (ghost) caused by an intraocular lens or the like is mixed in the pattern image.

The determination unit 310 of the first embodiment is configured to determine, for example, whether the brightness of the pattern image (point image group) detected by the aberration measurement projection system 6 and the aberration measurement light receiving system 7 satisfies a predetermined condition. .. This predetermined condition is set in advance. Such a determination unit 310 corresponds to the first determination unit. Hereinafter, an example of the process executed by the determination unit 310 will be described.

In the first example, the determination unit 310 determines whether or not there is a pixel having a brightness value equal to or greater than a threshold value among the plurality of pixels constituting the pattern image. When such a pixel exists, the determination unit 310 determines that the above-mentioned predetermined condition is satisfied.

In the second example, the determination unit 310 determines the number of pixels having a brightness value equal to or higher than the threshold value among the plurality of pixels constituting the pattern image. Further, the determination unit 310 determines whether the obtained number is equal to or more than a predetermined number. When it is determined that the number is equal to or greater than the predetermined number, the determination unit 310 determines that the above-mentioned predetermined condition is satisfied.

In the third example, the determination unit 310 obtains the statistical value of the luminance value for at least a part of the plurality of pixels constituting the pattern image. This statistic may be, for example, one of the following: integral; mean; median; mode; variance; standard deviation; maximum; difference between maximum and minimum. The determination unit 310 compares the obtained statistical value with the threshold value. When it is determined that the statistical value is equal to or greater than the threshold value, the determination unit 310 determines that the above-mentioned predetermined conditions are satisfied. The threshold value is set in advance according to the type of statistical value to be applied.

When the determination unit 310 determines that the pattern image satisfies a predetermined condition, the notification control unit 102 can notify the determination result. Further, when the determination unit 310 determines that the pattern image satisfies the predetermined condition, the display control unit 101 can start displaying the pattern image.

(User interface unit 400)
The user interface (UI) unit 400 has a function for exchanging information between the user (examiner, subject) and the ophthalmologic imaging apparatus. The user interface unit 400 includes a display unit 410 and an operation unit 420.

The display unit 410 includes, for example, a liquid crystal display (LCD). The display unit 410 includes, for example, the display device 10 shown in FIG. The ophthalmic apparatus does not have to include the display unit 410. In this case, an external display device (for example, display device 10) connected to the ophthalmic device is used.

The operating unit 420 is used to operate the ophthalmic apparatus and includes various hardware keys and / or software keys. Hardware keys include, for example, levers, joysticks, buttons, switches and the like. The software key includes, for example, buttons, icons, menus, and the like displayed on a touch panel type display screen (for example, display screen 10a).

(Communication unit 500)
The communication unit 500 includes a communication interface for transmitting / receiving data to / from an external device (not shown).

<motion>
The operation of the ophthalmic apparatus according to the embodiment will be described. An example of the operation is shown in FIG.

(S1: Start video recording of the anterior segment)
The control unit 100 controls the observation system 5 to start taking a moving image of the anterior segment of the eye E to be inspected. As a result, the supply of the video signal from the area sensor 56 to the control unit 100 is started. The video signal is repeatedly supplied at predetermined time intervals.

(S2: Start acquisition of alignment data)
The control unit 100 controls the Z alignment system 1 to start projecting light (Z alignment index) for Z alignment on the eye E to be inspected. As a result, the supply of signals from the line sensor 13 of the Z alignment system 1 to the control unit 100 is started. This signal is repeatedly supplied at predetermined time intervals.

Further, the control unit 100 controls the XY alignment system 2 to start projecting light (XY alignment index) for XY alignment on the eye E to be inspected. As a result, the area sensor 56 detects the image of the XY alignment index together with the image of the anterior segment of the eye. That is, the signal corresponding to the image of the XY alignment index is included in the video signal supplied from the area sensor 56 to the control unit 100.

(S3: Start detection of pattern image)
The control unit 100 controls the aberration measurement projection system 6 to start projecting the measurement light onto the eye E to be inspected. As a result, the aberration measurement light receiving system 7 starts detecting the point image group (pattern image) generated by the Hartmann plate 75. The aberration measurement light receiving system 7 repeats the detection of the pattern image at predetermined time intervals. The detection result (video signal) of the pattern image is repeatedly supplied to the control unit 100 at predetermined time intervals.

The execution order of the three processes shown in steps S1 to 3 is not limited to this example. For example, these three processes can be sequentially executed in any order. Alternatively, any two or all of these three processes can be performed in parallel.

It is also possible to further perform a process different from these three processes. For example, the control unit 100 can control the target projection system 4 to present the fixation target to the eye E to be inspected.

(S4: Start displaying the anterior segment image, alignment information, and pattern image)
The display control unit 101 receives a moving image of the anterior segment of the eye (anterior segment image E') and an image of the XY alignment index (an image of the anterior segment of the eye) based on a video signal supplied from the area sensor 56 of the observation system 5 at predetermined time intervals. The bright spot image Br) is displayed on the display unit 410.

Further, the display control unit 101 causes the display unit 410 to display a pattern image based on the video signal supplied from the aberration measurement light receiving system 7 at predetermined time intervals.

An example of the information displayed in step S4 is shown in FIG. The display control unit 101 causes the display unit 410 to display the screen 600. Reference numeral 601 indicates an anterior segment image based on a video signal from the observation system 5. The display control unit 101 updates the frame of the anterior segment image 601 according to the supply rate of the video signal from the observation system 5. As a result, the anterior segment image 601 is displayed as a moving image.

Reference numeral 611 indicates an XY alignment mark which is a target range of XY alignment. The XY alignment mark 611 has a predetermined size and is superimposed and displayed at a predetermined position on the frame of the anterior segment image 601.

Reference numeral 612 indicates an XY alignment index image displayed as a bright spot image. According to the update of the frame of the anterior segment image 601, in other words, the position of the XY alignment index image 612 in the frame of the anterior segment image 601 changes according to the time course of the XY alignment state.

Reference numeral 620 indicates a Z alignment index image representing a state of Z alignment (projection position of light with respect to the line sensor 13). The number of Z-alignment index images 620 represents the magnitude of the amount of Z-alignment deviation.

Further, the display control unit 101 displays the pattern image 630 based on the video signal from the aberration measurement light receiving system 7. The display control unit 101 updates the frame of the pattern image 630 according to the supply rate of the video signal from the aberration measurement light receiving system 7. As a result, the pattern image 630 is displayed as a moving image.

(S5: Start ghost judgment)
In response to the start of the detection of the pattern image in step S3, the control unit 100 starts the determination unit 310 to determine the presence or absence of the ghost.

(S6: Start manual alignment)
When displayed on the screen 600, the examiner can start the manual alignment. The alignment operation is performed using the operation unit 420.

(S7: Move the head part)
The examiner performs the alignment while referring to the information displayed on the screen 600. Specifically, the examiner performs the following operation while grasping the state of the eye to be inspected E by the anterior eye portion image 601: The head portion 200 is moved in the X direction and the Y direction, and the XY alignment index image 612 is performed. Is guided into the XY alignment mark 611; the head portion 200 is moved in the Z direction to reduce the number of Z alignment index images 620. The movement of the head portion 200 is performed by controlling the moving mechanism 210.

In this example, in such manual alignment, the examiner can refer to the pattern image 630. For example, when the eye E to be inspected is an IOL eye, noise light due to reflection by the intraocular lens may be mixed in the pattern image 630. Typically, such noise light is brighter than the fundus reflected light of the measurement light. Therefore, when noise light caused by the intraocular lens is mixed, the brightness of a part of the pattern image 630 becomes abnormally high. By performing alignment while observing the pattern image 630, the examiner can arrange the head portion 200 at a position where noise light is not mixed or at a position where noise light is mixed in an acceptable amount. ..

(S8: Is there a ghost?)
If it is determined that the pattern image does not contain ghosts in the ghost determination started in step S5 (S8: No), the process proceeds to step S10. On the other hand, when it is determined that the pattern image contains ghosts (S8: Yes), the process proceeds to step S9.

(S9: Notification)
When it is determined in step S8 that the pattern image contains ghosts (S8: Yes), the notification control unit 102 controls to output notification information indicating that ghosts are present. The notification in this step may include, for example, display of a message or image indicating the presence of a ghost, output of a warning sound, and the like.

The notification in this step may be switching of the display mode of the object displayed on the screen 600. For example, the notification control unit 102 can change the display mode of the alignment information displayed on the screen 600. For example, when it is determined that a ghost is present, the notification control unit 102 can change the display color of the XY alignment mark 611 or blink the XY alignment mark 611. Alternatively, when it is determined that a ghost of a predetermined threshold value or more is present, the notification control unit 102 can change the display mode of the alignment information.

In addition, the mode of the broadcast information can be switched according to the degree of ghost included in the pattern image. For example, the display color of the XY alignment mark 611 can be switched to "blue", "yellow", "red", etc., depending on the degree of ghost contained in the pattern image.

According to such notification, the examiner can easily grasp whether the pattern image contains ghosts and how much ghost light is mixed. In particular, even an examiner who is unfamiliar with observing a pattern image can easily grasp that an abnormality has occurred in the pattern image.

(S10: Alignment completed?)
By performing such manual alignment, the examiner arranges the head portion 200 at a desired position. Ideally, the head portion 200 is arranged at a position where the XY alignment index image 612 is arranged in the XY alignment mark 611, the Z alignment index image 620 is not displayed, and the pattern image 630 containing no ghost is obtained. Will be done.

On the other hand, it may be necessary to "compromise" at least one of the XY alignment state, the Z alignment state, and the pattern image 630 state. For example, in order to obtain a pattern image 630 having no noise light (or less noise light), it may be allowed that the XY alignment index image 612 is arranged on or outside the frame of the XY alignment mark 611. In addition, the alignment state may be prioritized over the pattern image 630 state.

The judgment of alignment completion is made by the examiner. The examiner can instruct the completion of alignment by performing a predetermined operation using the operation unit 420 (S10: Yes).

(S11: Measure the eye to be inspected)
When the instruction to complete the alignment is input, the control unit 100 controls the optical system and the like to measure the eye E to be inspected. In this example, the measurement can be performed by the following series of processes.

It should be noted that at least a part of the information presented on the screen 600 can be changed before the measurement is started. For example, the display of the pattern image 630 can be terminated. On the contrary, the pattern image 630 can be displayed at least for a part of the period during which the measurement is performed.

Here, it can be configured so that the on / off of the display of the pattern image 630 can be set by using the operation unit 420. For example, the operation unit 420 includes one or both of a hardware key or software key for turning on the display of the pattern image 630 and a hardware key or software key for turning off the display of the pattern image 630. Good.

When the user sets "display off", the light source 61 is turned off, and when "display on" is set, the light source 61 is turned on. In this example, "display on" is set.

Further, as will be described in detail later, it is also possible to configure the ophthalmic apparatus so as to automatically select on / off of the display of the pattern image 630.

By the way, in the measurement of this example, a tentative measurement is first performed. In the tentative measurement, for example, a fixed target such as a landscape chart is used. This fixation target is displayed on the target target chart 42 and has been presented to the eye E to be inspected since the time when the alignment was disclosed. Under the control of the control unit 100, the aberration measurement projection system 6 and the aberration measurement light receiving system 7 project the measurement light onto the eye E to be inspected, and a pattern image (point image group) based on the return light is generated by the area sensor 76. To detect.

The data processing unit 300 obtains the refractive power value of the eye E to be inspected based on the pattern image detected by the area sensor 76. Further, the data processing unit 300 (or the control unit 100) determines the movement target positions of the movement units 46, 69, and 77, respectively, based on the calculated eye refractive power value. The control unit 100 arranges the movement units 46, 69, and 77 at the determined movement target positions (positions that cancel the refractive power of the eye E to be inspected). Here, the above control may be repeated until the moving units 46, 69 and 77 are arranged at suitable positions. As described above, the moving units 46, 69 and 77 may be moved individually, any two of them may be moved integrally, or all of them may be moved integrally. You may let me.

When the moving units 46, 69 and 77 are arranged at positions corresponding to the refractive power of the eye E to be inspected, the control unit 100 moves the moving unit 46 from that position by, for example, 1.5 diopters to the hyperopia side. As a result, the eye E to be inspected can be fogged.

Subsequently, the process shifts to the main measurement. Under the control of the control unit 100, the aberration measurement projection system 6 and the aberration measurement light receiving system 7 detect the pattern image (point image group) based on the return light of the measurement light again by the area sensor 76. The data processing unit 300 measures the eyeball aberration characteristics of the eye E to be inspected by analyzing this pattern image. Further, the corneal shape measurement using the purachido index projection system 3 and the subjective examination using the optotype projection system 4 can be performed.

(S12: Alignment deviation ≥ threshold value?)
The notification control unit 102 determines whether the amount of misalignment is equal to or greater than the threshold value. This threshold value is set in advance based on, for example, the type of measurement, the type of ophthalmic apparatus, the required measurement accuracy, and the like.

The determination is executed at any timing after the measurement, before the measurement, or during the measurement. Further, the detection of the amount of misalignment is also executed at any timing after the measurement, before the measurement, or during the measurement. The alignment deviation amount referred to in the determination may be a value acquired during steps S6 to S10, or may be a value newly acquired thereafter.

The amount of misalignment is detected by using, for example, the XY alignment index image 612. Typically, the data processing unit 300 obtains the deviation of the XY alignment index image 612 with respect to a predetermined position of the frame (eg, the center or the frame of the XY alignment mark 611). The notification control unit 102 compares the magnitude of this deviation with the threshold value. The same determination can be made when the amount of Z-alignment deviation is taken into consideration.

When the notification control unit 102 determines that the amount of misalignment is equal to or greater than the threshold value (S12: Yes), the process proceeds to step S13. On the other hand, when the notification control unit 102 determines that the amount of misalignment is less than the threshold value (S12: No), the process skips step S13 and proceeds to step S14.

(S13: Display notification information)
When it is determined that the amount of misalignment is equal to or greater than the threshold value (S12: Yes), the notification control unit 102 causes the display unit 410 to display predetermined notification information. This notification information includes, for example, information indicating that the measurement was performed in a state where the alignment is insufficient than usual, or information indicating that the reliability (accuracy, accuracy, etc.) of the measurement result is lower than usual. Including.

As described above, the mode of notification is not limited to the display, and may include any mode such as voice output, print output, and information attachment.

(S14: Display measurement result)
The display control unit 101 causes the display unit 410 to display the data acquired by the measurement in step S11. When step S13 is performed, the measurement result and the notification information are displayed on the display unit 410. This is the end of the explanation of this example.

<effect>
Some of the effects of the ophthalmic apparatus according to the embodiment will be described.

The ophthalmic apparatus according to the embodiment includes a function for optically inspecting the eye to be inspected. Further, the ophthalmic apparatus according to the embodiment includes the following optical system, alignment system, and determination unit.

The optical system projects a luminous flux toward the fundus of the eye to be inspected and detects the return light as a pattern image. In the first embodiment, the optical system includes an aberration measurement projection system 6 that projects a luminous flux toward the fundus of the eye to be inspected, and an aberration measurement light receiving system 7 that detects the return light of the measurement light as a pattern image.

The alignment system operates to align the optical system with respect to the eye to be inspected. In the first embodiment, the alignment system may include a configuration for manual alignment. The configuration for manual alignment includes, for example, an operation unit 420, a moving mechanism 210, and a control unit 100. Further, the alignment system may include a configuration for auto alignment. The configuration for auto alignment includes, for example, a Z alignment system 1, an XY alignment system 2, an observation system 5, a moving mechanism 210, and a control unit 100.

The determination unit analyzes the pattern image detected by the optical system when the alignment is performed by the alignment system, and determines the presence or absence of ghost. In the first embodiment, the determination unit includes the determination unit 310.

The ophthalmic apparatus according to such an embodiment is configured to analyze a pattern image before or during measurement to determine whether or not ghost (noise light) is contained. As a result, the examiner can confirm whether or not noise light caused by the intraocular lens or the like is mixed in the pattern image. Alternatively, the ophthalmic apparatus can be configured to perform the desired control when a ghost is detected.

Therefore, it is possible to avoid the occurrence of measurement errors, and it is possible to preferably perform an examination of an IOL eye or the like. In the technique described in Patent Document 1, since the pattern image is displayed after the measurement, it is impossible to obtain such an effect.

In the embodiment, the determination unit may include a first determination unit that determines whether the brightness of the pattern image detected by the optical system satisfies a predetermined condition. In the first embodiment, the determination unit 310 corresponds to the first determination unit.

In the embodiment, when the optical examination of the eye to be inspected is performed after the alignment, the determination unit can analyze the pattern image detected by the optical system to determine the presence or absence of ghost.

According to such a configuration, it is possible to confirm the state of the pattern image (presence / absence / degree of noise light contamination, etc.) not only during alignment but also during inspection (measurement). Therefore, it is possible to detect when noise light is mixed or increased after the inspection is started.

In the embodiment, the ophthalmic apparatus may include a notification control unit that notifies that the determination unit has determined that the pattern image contains a ghost.

According to such a configuration, the examiner, the subject, and others are notified that noise light is mixed in the pattern image and that the pattern image contains noise exceeding a predetermined threshold value. Can be done.

In the embodiment, the optical system may include an optical element that generates pattern light from the return light from the eye to be inspected, and an image sensor that detects the generated pattern light as a pattern image. In the first embodiment, the Hartmann plate 75 that generates a plurality of focused lights from the return light corresponds to an optical element, and the area sensor 76 that detects a plurality of focused lights as a point image group corresponds to an image sensor. The configuration of the optical system is not limited to this. For example, the optical system may include an optical element having a ring-shaped aperture or a transmitting portion, and an image sensor that detects ring-shaped pattern light generated by the optical element as a ring image. Here, the "pattern" may include either or both of the "array pattern" and the "shape pattern".

In other embodiments, the optical system may include a projection optical system that projects a predetermined pattern of luminous flux toward the fundus. The projection optical system is configured to be capable of outputting, for example, a predetermined pattern of light (eg, ring light), a plurality of luminous fluxes, or a scanning luminous flux.

In embodiments, the optics can iteratively perform pattern image detection. Further, the determination unit can iteratively determine the presence or absence of ghosts in response to the repetition of detection of the pattern image by the optical system.

According to such a configuration, the presence or absence of ghost can be determined by analyzing the pattern image repeatedly acquired in real time. As a result, the state of the noise light mixed in the pattern image can be grasped in more detail and in real time.

In an embodiment, the ophthalmic apparatus may include a display control unit that causes a display means to display predetermined information for alignment and a pattern image detected by an optical system when alignment is performed. In the first embodiment, the display control unit includes the display control unit 101. Further, as an example of the alignment information, in the first embodiment, the XY alignment mark 611, the XY alignment index image 612, the Z alignment index image 620, and the like can be displayed. Further, as an example of the pattern image, the pattern image 630 can be displayed. The display means may or may not be included in the ophthalmic apparatus according to the embodiment. The display unit 410 of the first embodiment is an example of the former. In the latter case, a configuration in which the display control unit can control the display device connected to the ophthalmic apparatus is applied.

According to such a configuration, not only the alignment information but also the pattern image can be displayed. Therefore, by observing the pattern image, the examiner can confirm whether or not noise light caused by the intraocular lens or the like is mixed in the pattern image. As a result, it is possible to avoid the occurrence of measurement errors, and it is possible to preferably perform an examination of an IOL eye or the like. In the technique described in Patent Document 1, since the pattern image is displayed after the measurement, it is impossible to obtain such an effect.

<Second Embodiment>
The ophthalmic apparatus according to the second embodiment has substantially the same configuration as the ophthalmic apparatus according to the first embodiment. Unless otherwise specified, the same configuration as in the first embodiment shall be applied. It should be noted that this does not exclude the application of a configuration different from that of the first embodiment.

FIG. 7 shows a configuration example of the processing system of the ophthalmic apparatus according to the second embodiment. In the second embodiment, the data processing unit 302 is provided instead of the data processing unit 300 of the first embodiment.

The data processing unit 302 includes a calculation unit 321 and a determination unit 322. The calculation unit 321 is an example of the calculation unit, and the determination unit 322 is an example of the second determination unit. The combination of the calculation unit 321 and the determination unit 322 corresponds to the determination unit.

The calculation unit 321 analyzes the pattern image detected by the optical system to obtain the refractive power value. This process is executed in the same manner as in the first embodiment. The refractive power value obtained by the calculation unit 321 may not faithfully represent the refractive power of the eye E to be inspected. For example, when the eye to be inspected E is an IOL eye, noise light (ghost) caused by an intraocular lens is mixed in the pattern image, and a bright spot composed of ghosts is mistaken as a bright spot due to fundus reflection, and the calculation of the refractive power is performed. When this is performed, a refractive power value corresponding to high-intensity hyperopia or ultra-high-intensity hyperopia may be obtained.

The determination unit 322 determines whether the refractive power value obtained by the calculation unit 321 is equal to or greater than the threshold value. This threshold is set based on, for example, the range of refractive power corresponding to intense hyperopia or ultra-intensity hyperopia. In one example, the minimum value of the range of refractive power corresponding to intense hyperopia (or super-intensity hyperopia) can be set as a threshold value.

When the determination unit 322 determines that the refractive power value is equal to or greater than the threshold value, the notification control unit 102 can notify the determination result. Further, when the determination unit 322 determines that the refractive power value is equal to or greater than the threshold value, the display control unit 101 can start displaying the pattern image. Here, the examiner can confirm whether or not ghosts are mixed in the pattern image. When the pattern image is not mixed with ghosts, the examiner can determine that the eye to be inspected E is a hyperopic eye exceeding a predetermined threshold value, and can cancel the "ghosted" determination obtained by the determination unit 322.

According to such an embodiment, the presence or absence of ghost can be determined according to the refractive power value calculated based on the pattern image.

<Third Embodiment>
The ophthalmic apparatus according to the third embodiment has substantially the same configuration as the ophthalmic apparatus according to the first embodiment (or the second embodiment). Unless otherwise specified, the same configuration as in the first embodiment shall be applied. It should be noted that this does not exclude the application of a configuration different from that of the first embodiment.

FIG. 8 shows a configuration example of the processing system of the ophthalmic apparatus according to the third embodiment. In the third embodiment, the moving mechanism 211 is provided instead of the moving mechanism 210 of the first embodiment. The moving mechanism 211 is electrically driven. Specifically, the moving mechanism 211 includes the motor 212, and is configured to move the head portion 200 based on the driving force generated by the motor 212.

Further, in the third embodiment, the control unit 100A is provided instead of the control unit 100 of the first embodiment. The control unit 100A includes a movement control unit 103. The movement control unit 103 controls the motor 212 of the movement mechanism 211 based on the data acquired by the alignment data acquisition unit. The movement control unit 103, together with the data processing unit 300, constitutes an example of the movement control unit.

Here, the alignment data acquisition unit is configured to acquire data for performing alignment. The alignment data acquisition unit may include, for example, an XY alignment system 2 and an observation system 5 for acquiring data for XY alignment. In this case, the alignment data acquisition unit may further include a data processing unit 300 that obtains an XY alignment deviation based on the output from the observation system 5.

Further, the alignment data acquisition unit may include, for example, a Z alignment system 1 that acquires data for Z alignment. In this case, the alignment data acquisition unit may further include a data processing unit 300 that obtains a Z alignment deviation based on the output from the Z alignment system 1.

The movement control unit 103 (and the data processing unit 300) can perform normal alignment by controlling the motor 212 based on the data acquired by the alignment data acquisition unit. This alignment may include, for example, either or both of the same XY alignment and Z alignment as in the first embodiment. The control for performing the alignment corresponds to the first control.

After executing such alignment, the movement control unit 103 (and the data processing unit 300) has the data acquired by the alignment data acquisition unit and the pattern image detected by the aberration measurement projection system 6 and the aberration measurement light receiving system 7. The motor 212 can be controlled based on the above. This control corresponds to the second control. The second control is performed to correct the alignment state achieved by the first control by adding a pattern image. This alignment modification is also included in the (broadly defined) alignment because it is an operation of adjusting the position of the optical system with respect to the eye to be inspected.

Regarding the second control, for example, which of the alignment state and the pattern image state is prioritized may be set in advance or during processing. Alternatively, the permissible range of the alignment state and the permissible range of the state of the pattern image may be set in advance or during processing.

The alignment state is evaluated based on, for example, the magnitude of the deviation of the XY alignment index image 612 with respect to a predetermined position of the frame (eg, the center or frame of the XY alignment mark 611). Further, the alignment state is, for example, the magnitude of the deviation of the position of the light receiving element that has detected the corneal reflex light with respect to the position of the specific light receiving element of the line sensor 13 (for example, the light receiving element located in the center of the line arrangement). Evaluated based on.

The state of the pattern image is evaluated based on the brightness of the pattern image detected by the aberration measurement projection system 6 and the aberration measurement light receiving system 7, for example, as in the determination unit 310 of the first embodiment. The data processing unit 300 shown in FIG. 8 is the same as that of the first embodiment, but the data processing unit of the third embodiment is not limited to this. For example, instead of the data processing unit 300, the data processing unit 302 of the second embodiment can be applied.

An example of the operation of the ophthalmic apparatus according to the third embodiment is shown in FIG.

(S21: Start alignment)
First, alignment is started. The alignment may be automatic alignment (auto alignment) or manual alignment (manual alignment).

(S22: Move the head part)
In the case of auto alignment, the movement control unit 103 (and the data processing unit 300) controls the motor 212 so as to cancel the deviation of the XY alignment index image 612 with respect to the XY alignment mark 611, for example. Further, the movement control unit 103 (and the data processing unit 300) controls the motor 212 so that the corneal reflected light is projected onto a specific light receiving element of the line sensor 13 of the Z alignment system 1, for example.

In the case of manual alignment, for example, the same processing as in steps S6 to S7 of FIG. 5 of the first embodiment is executed.

(S23: Alignment completed?)
The auto alignment is performed, for example, when the state in which the corneal reflected light is projected onto the specific light receiving element of the line sensor 13 and the state in which the XY alignment index image 612 is located within the XY alignment mark 611 are compatible. It will be completed.

The manual alignment is completed according to the judgment of the examiner as in the first embodiment.

(S24: Acquire pattern image)
The control unit 100 controls the aberration measurement projection system 6 to start projecting the measurement light onto the eye E to be inspected. As a result, the aberration measurement light receiving system 7 starts detecting the point image group (pattern image) generated by the Hartmann plate 75.

In this example, unlike the operation example shown in FIG. 5 of the first embodiment, it is not necessary to repeatedly detect the pattern image.

(S25: Is there a ghost?)
The data processing unit 300 determines whether or not the pattern image acquired in step S24 contains a ghost. This process is executed in the same manner as the determination unit 310 of the first embodiment, for example.

When it is determined that the pattern image does not contain ghosts (S25: No), the process proceeds to step S28. On the other hand, when it is determined that the pattern image contains ghosts (S25: Yes), the process proceeds to step S26.

(S26: Alignment corrected)
When it is determined in step S25 that the pattern image contains a ghost (S25: Yes), the movement control unit 103 and the data processing unit 300 execute a process for adjusting the alignment state.

For example, the control unit 100 causes the head unit 200 to move, determine the alignment state, and determine the state of the pattern image. The movement of the head unit 200 is executed by the movement control unit 103 (and the data processing unit 300). The alignment state is determined by the Z alignment system 1, the XY alignment system 2, the data processing unit 300, and the like. The determination of the state of the pattern image is executed by the aberration measurement projection system 6, the aberration measurement light receiving system 7, the data processing unit 300, and the like.

Typically, as the head portion 200 moves, the alignment data and the pattern image are acquired twice or more. Regarding the alignment state, the movement target position of the head unit 200 can be determined by comparing two or more alignment data. Alternatively, the head portion 200 may be moved to search for a position where the alignment deviation becomes small.

(S27: Is there a ghost?)
The data processing unit 300 determines whether or not the pattern image acquired after step S25 contains a ghost. This process is executed in the same manner as in step S25.

When it is determined that the pattern image does not contain ghosts (S27: No), the process proceeds to step S28. On the other hand, when it is determined that the pattern image contains ghosts (S27: Yes), the process returns to step S26.

The repetition of steps S26 to S27 is continued until, for example, both the alignment state and the pattern image state become suitable. Alternatively, the repetition of steps S26 to S27 is continued until one of the alignment state and the pattern image state (priority side) becomes suitable and the other is within the permissible range. You may. This tolerance may be set wider than the normal tolerance.

When the repetition of steps S26 to S27 is continued for a predetermined time (or a predetermined number of times), the control unit 100 can switch the alignment mode to manual alignment. Alternatively, when the repetition of steps S26 to S27 is continued for a predetermined time (or a predetermined number of times), the control unit 100 can display information prompting the switch to manual alignment and warning information on the display unit 410.

(S28: Measure the eye to be inspected)
When it is determined in step S27 that the pattern image does not contain ghosts (S27: No), the eye E to be inspected is measured in the same manner as in step S11 of FIG. 5 of the first embodiment.

(S29: Alignment deviation ≥ threshold value?)
In the same manner as in step S12 of FIG. 5 of the first embodiment, the notification control unit 102 determines whether the amount of misalignment is equal to or greater than the threshold value.

When the notification control unit 102 determines that the amount of misalignment is equal to or greater than the threshold value (S29: Yes), the process proceeds to step S30. On the other hand, when the notification control unit 102 determines that the amount of misalignment is less than the threshold value (S29: No), the process skips step S30 and proceeds to step S31.

(S30: Display notification information)
When it is determined that the amount of misalignment is equal to or greater than the threshold value (S29: Yes), the notification control unit 102 causes the display unit 410 to display predetermined notification information. This process is executed in the same manner as in step S13 of FIG. 5 of the first embodiment.

(S31: Display measurement result)
The display control unit 101 causes the display unit 410 to display the data acquired by the measurement in step S28. When step S30 is performed, the measurement result and the notification information are displayed on the display unit 410. This is the end of the explanation of this example.

According to such an embodiment, it is possible to realize (automatic) alignment in consideration of both the alignment information and the pattern image.

<Modification example, etc.>
The embodiments shown above are merely examples for carrying out the present invention. A person who intends to carry out the present invention can make arbitrary modifications, omissions, additions, etc. within the scope of the gist of the present invention.

It is possible to combine any two or more of the above-mentioned first to third embodiments.

The alignment method is arbitrary. For example, instead of (or in addition to) the Z alignment system 1, the XY alignment system 2, the observation system 5, etc. of the above embodiment, the stereo camera system disclosed in Japanese Patent Application Laid-Open No. 2013-248376 is adopted. can do. In the stereo camera method, two or more shooting units (two or more cameras) capable of shooting the anterior segment from different directions and two or more shot images acquired substantially at the same time by the two or more shooting units are analyzed. An analysis unit is provided to obtain the three-dimensional position of the eye to be inspected. The analysis uses a known trigonometry.

When a configuration capable of displaying a pattern image not only during alignment but also during inspection (measurement) is applied, the display mode of the pattern image can be changed between alignment and inspection. For example, in the above embodiment, the display brightness of the pattern image can be changed between during alignment and during inspection.

When the light source 61 is turned on during alignment, it is not necessary to rotate the rotary prism 67. On the other hand, when the light source 61 is turned on during the inspection (measurement), the rotary prism 67 is rotated.

Embodiments include a method of controlling an ophthalmic apparatus for optically examining an eye to be inspected. This control method includes the following steps: the first step of aligning the ophthalmologic device with respect to the eye to be inspected; when the first step of alignment is being performed, a luminous flux is projected toward the fundus of the eye to be inspected. Second step of detecting the return light as a pattern image; a third step of analyzing the pattern image detected in the second step to determine the presence or absence of ghost when the alignment of the first step is performed.

According to such an embodiment, it is possible to avoid the occurrence of measurement errors due to the mixing of ghosts and the like, and it is possible to preferably perform an examination of an IOL eye or the like.

The embodiment includes a computer program for realizing any of the following: an ophthalmic device according to an embodiment; an arbitrary combination of components of the ophthalmic device according to the embodiment: a control method according to the embodiment; a control according to the embodiment. Any combination of method components.

The embodiment includes a recording medium in which any of the computer programs described above is stored. Using the recording medium according to the embodiment, any of the above-mentioned computer programs can be installed in an ophthalmic apparatus or a computer. The recording medium according to the embodiment may be a non-transient recording medium. The type of non-transient recording medium is not particularly limited. For example, a CD-ROM can be used as a non-transient recording medium.

1 Z alignment system 2 XY alignment system 5 Observation system 6 Aberration measurement Projection system 7 Aberration measurement Light receiving system 100 Control unit 101 Display control unit 102 Notification control unit 103 Movement control unit 200 Head unit 300 Data processing unit 310 Judgment unit 321 Calculation unit 322 Judgment unit

Claims (11)

An ophthalmic device for optically examining the eye to be inspected.
In the optical examination of the eye to be inspected, an optical system that projects a luminous flux toward the fundus of the eye to be inspected and detects the return light as a pattern image.
An alignment system for aligning the optical system with respect to the eye to be inspected,
When the alignment is performed by the alignment system, seen including a determination unit for determining presence or absence of ghosts by analyzing the pattern image detected by the optical system,
The alignment system is
An alignment data acquisition unit that acquires data for performing the alignment, and an alignment data acquisition unit.
A moving mechanism that includes a motor and moves the optical system based on the driving force generated by the motor.
A movement control unit that controls the motor based on the data acquired by the alignment data acquisition unit.
Including
The movement control unit is detected by the data acquired by the alignment data acquisition unit and the optical system after executing the first control for controlling the motor based on the data acquired by the alignment data acquisition unit. The second control for controlling the motor is executed based on the pattern image.
An ophthalmic device characterized by that. After the first control is executed by the movement control unit, the optical system executes the detection of the pattern image.
The determination unit analyzes the first pattern image detected by the optical system after the first control to determine the presence or absence of ghosts.
When the determination unit determines that the first pattern image contains ghosts, the determination unit executes a process for correcting the alignment state, and determines that the first pattern image does not contain ghosts. If so, the optical system detects a pattern image for the optical examination of the eye to be inspected.
The ophthalmic apparatus according to claim 1. After adjusting the alignment state, the determination unit analyzes the second pattern image detected by the optical system after the first pattern image to determine the presence or absence of ghosts.
If the determination unit determines that the second pattern image contains ghosts, the determination unit executes the process for correcting the alignment state again, and if the second pattern image does not include ghosts, the determination unit executes the process again. If it is determined, the optical system detects a pattern image for the optical examination of the eye to be inspected.
The ophthalmic apparatus according to claim 2. The ophthalmic apparatus according to any one of claims 1 to 3, wherein the determination unit includes a first determination unit that determines whether the brightness of the pattern image detected by the optical system satisfies a predetermined condition. .. The determination unit
An arithmetic unit that analyzes the pattern image detected by the optical system to obtain a refractive power value, and
The ophthalmologic apparatus according to any one of claims 1 to 4, further comprising a second determination unit for determining whether or not the refractive power value obtained by the calculation unit is equal to or greater than a predetermined threshold value. When the optical examination of the eye to be inspected is performed after the alignment, the determination unit analyzes the pattern image detected by the optical system to determine the presence or absence of ghosts. The ophthalmic apparatus according to any one of claims 1 to 5. The ophthalmologic apparatus according to any one of claims 1 to 6 , further comprising a notification control unit that notifies that the pattern image contains a ghost. The optical system is
An optical element that generates pattern light from the return light,
The ophthalmologic apparatus according to any one of claims 1 to 7, further comprising an image sensor that detects the pattern light as the pattern image. The optical system iteratively performs detection of the pattern image and
The ophthalmic apparatus according to any one of claims 1 to 8, wherein the determination unit repeatedly executes determination of the presence or absence of the ghost in response to the repetition of detection of the pattern image by the optical system. Claim 1 is characterized by including a display control unit that causes a display means to display predetermined information for the alignment and the pattern image detected by the optical system when the alignment is performed. 9. The ophthalmic apparatus according to any one of 9. It is a control method of an ophthalmic device for optically inspecting an eye to be inspected.
The step of aligning the ophthalmologic device with respect to the eye to be inspected,
In the optical examination of the eye to be inspected, a step of projecting a luminous flux toward the fundus of the eye to be inspected and detecting the return light as a pattern image when the alignment is performed.
When the alignment is being performed, it sees containing and determining the presence or absence of ghosts by analyzing the pattern image,
The ophthalmic device
An optical system that projects a luminous flux toward the fundus of the eye to be inspected and detects the return light as a pattern image.
With an alignment system for aligning the optical system with respect to the eye to be inspected
Including
The alignment system is
An alignment data acquisition unit that acquires data for performing the alignment, and an alignment data acquisition unit.
A moving mechanism that includes a motor and moves the optical system based on the driving force generated by the motor.
A movement control unit that controls the motor based on the data acquired by the alignment data acquisition unit.
Including
A step of executing the first control for controlling the motor based on the data acquired by the alignment data acquisition unit, and
After executing the first control, a step of executing the second control for controlling the motor based on the data acquired by the alignment data acquisition unit and the pattern image detected by the optical system.
including
A method of controlling an ophthalmic apparatus.

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