JP3497004B2 - Ophthalmic equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus in which a plactide pattern projection system for projecting a plactide pattern onto the cornea of an eye to be examined is integrated with an ophthalmic apparatus for measuring the refractive power of the eye to be examined.

[0002]

2. Description of the Related Art Conventionally, a corneal shape measuring device for projecting a Placido pattern toward the cornea of an eye to be examined and an eye refractive power measuring device for measuring eye refractive power are known.

By the way, corneal shape data, eye refractive power data, and the like are important data for making appropriate diagnosis, and therefore, both measurement devices are used for measurement.

[0004]

However, the above two measuring devices are separate bodies, and the corneal shape must be measured by the corneal shape measuring device, and the eye refractive power must be measured by the eye refractive power measuring device. Therefore, the subject and the examiner have to move to their respective devices, which is very inconvenient.

In order to solve this problem, when the cornea shape measuring device and the eye refractive power measuring device are integrated, it is necessary to measure both eyes, so that adjustment and tension do not need to be continued left and right. The measurement must be done promptly.
Therefore, after projecting the Placido pattern to the left and right eyes to store the Placido pattern image in the memory, the eye refractive power of the left and right eyes is measured, and thereafter, mapping calculation or this based on the image stored in the memory is performed. There is a desire to record the corneal shape obtained by calculation.

However, since the conventional corneal shape measuring apparatus has only a memory for storing the Placido pattern image of one eye, there is a problem that the above demand cannot be satisfied.

The present invention has been made in view of the above problems, and an object thereof is to enable quick measurement of the left and right eyes and to integrate a cornea shape measuring device and an eye refractive power measuring device. To provide an ophthalmologic apparatus.

[0008]

In order to achieve the above object, in the invention of claim 1, the main body is provided on a pedestal so as to be movable in the front, rear, left and right directions with respect to the eye to be inspected, and the main body is provided with the eye to be inspected. In an ophthalmologic apparatus equipped with a measurement optical system for measuring the refractive power of the placido pattern projection system, which is provided in the main body and projects a placido pattern toward the cornea of the eye to be inspected, whichever of the left and right eyes is measured. A left-right detection unit that detects whether or not there is an image capturing unit that is provided in the main body and captures a Placido pattern image by reflection of the cornea; Storage means for identifying and storing the left and right eyes based on detection by the detection means; and the main body
And means for calculating the corneal shape of the left and right eyes from the Placido pattern images of the left and right eyes stored in the storage means
And a monitor for displaying the image captured by the image capturing means.
And the measuring optical system to measure the refractive power of the subject's eye.
The placidopa stored in the storage means during
A placido switch for displaying a turn image on the monitor.
Switch and this placido switch is operated, the left
When the right detection means is detecting the left eye, it is recorded in the storage means.
The remembered left-eye Placido pattern image on the monitor
When the right and left detection means are detecting the right eye
The plactide pattern of the right eye stored in the storage means
Display control means for displaying an image on the monitor,
And said that you are.

[0009]

According to a second aspect of the invention, the storage means comprises:
It is composed of a first frame memory for storing the Placido pattern image of the left eye and a second frame memory for storing the Placido pattern image of the right eye. One of the first and second frame memories is selected to Selected first and second
A selection switch for displaying the image stored in the frame memory on the monitor is provided.

According to the third aspect of the present invention, when the Placido pattern image captured by the image capturing unit is displayed on the monitor, whether the Placido pattern image is for the right eye based on the detection by the left and right eye detecting unit. It is characterized in that mark display means for displaying a mark indicating whether it is for the left eye on the monitor is provided.

[0012]

According to the invention of claim 1, the placido pattern projection system projects the placido pattern toward the cornea of the eye to be inspected, the left and right detection means detect which of the left and right eyes is being measured, and the image pickup means A placido pattern image by reflection of the cornea is imaged, the storage means stores the placido pattern image of the left and right eyes by distinguishing the left and right eyes based on the detection of the left and right detection means.
The calculation means calculates the corneal shapes of the left and right eyes from the Placido pattern images of the left and right eyes stored in the storage means. Also,
Nita displays the image being picked up by the image pickup means,
While measuring the refractive power of the eye by the academic system,
When the tide switch is operated, the display control means detects left and right
Stored in the storage means when the means detects the left eye
Display the Placido pattern image of the left eye on the monitor,
When the left and right detection means is detecting the right eye
The stored PLATID pattern image of the right eye is displayed on the monitor.
Let me show you.

[0013]

According to the second aspect of the present invention, either one of the first and second frame memories is selected by operating the selection switch, and the image stored in the selected first and second frame memories is displayed. Displayed on the monitor.

According to the third aspect of the present invention, when the placido pattern image captured by the imaging means is displayed on the monitor, the mark display means forms the placido pattern image based on the detection by the left and right eye detection means. A mark indicating the right eye or the left eye is displayed on the monitor.

[0016]

Embodiments of the ophthalmologic apparatus according to the present invention will be described below with reference to the drawings.

1 and 2 show an ophthalmologic apparatus A in which a corneal shape measuring apparatus is integrated with an eye refractive power measuring apparatus. In FIG. 1 and FIG. 1, reference numeral 1 is a pedestal of an ophthalmologic apparatus A, and a pedestal 1 is provided with a slide base 2 and a chin rest 4 which are movable in the front-rear and left-right directions. The main body 3 on the slide base 2
Is provided, and the main body 3 moves back and forth and left and right together with the slide base 2. The main body 3 can be moved up and down by operating the joystick 5.

The slide base 2 is moved in the front-rear and left-right directions by operating the joystick 5, and the slide base 2 is provided with a micro switch 6 ( left-right detection means). When the main body 3 is moved to the right (in FIG. 2) together with the slide base 2 to measure the right eye, the micro switch 6 detects this and outputs a right detection signal GR to the left eye. Body 3 to make measurements of
When the slide base 2 is moved to the left along with the slide base 2, it detects this and outputs a left detection signal GL.

In the main body 3, as shown in FIG. 3, an anterior segment observation optical system 10 for observing the anterior segment of the eye E and fixation target projection optics for projecting a fixation target on the eye E. A system 50, a measurement projection optical system 70 that projects measurement light for measuring eye refractive power onto the fundus Er of the eye E, and a light receiving optical system 90 that receives measurement light reflected by the fundus Er are provided. ing. In addition, on the front surface of the main body 3, a placido pattern projection system 100 that projects a placido pattern for measuring the corneal shape on the cornea Ec of the eye E to be inspected, and a mark projection that projects a working distance detection mark toward the cornea Ec. An optical system 120 is provided. The measurement projection optical system 70 and the light receiving optical system 90 form a measurement optical system that measures the eye refractive power of the eye E to be inspected.

The anterior segment observation optical system 10 includes an objective lens 11
A dichroic mirror 60, a mirror 13, a relay lens 14, a dichroic mirror 15, a relay lens 16, an image forming lens 17, and an area sensor (imaging means) 18 including a CCD.

Further, the anterior ocular segment observation optical system 10 is provided with a scale projection system 20 for forming a cross-shaped scale image P (see FIG. 9) on the area sensor 18. The scale projection system 20 includes a light source 21, a condenser lens 22,
A scale plate 23 having a scale (not shown) is provided, and the light emitted from the light source 21 is condensed by the condenser lens 22.
The scale plate 23 irradiates the scale plate 23 and the cross-shaped light flux reaches the imaging lens 16 via dichroic mirrors 15 and 92 (described later). A scale image P is formed on the image 18. Then, the scale image P is displayed on the monitor 202 (see FIG. 9) together with the anterior segment.

The fixation target projection optical system 50 includes a light source 51, a filter F for cutting infrared rays, and a condenser lens 52.
, Fixation target plate 53, relay lens 54, and mirror M1
, Dichroic mirror 55, relay lens 56
, Mirror M2, relay lens 57, mirror M3,
The dichroic mirror 60 and the objective lens 11 are provided. The fixation target plate 53 is in a conjugate position with the fundus Er, and a mark (not shown) serving as a fixation target is formed on the fixation target plate 53, and this mark is projected on the fundus Er. By projecting this mark, the eye E to be inspected is directed in a predetermined direction and is viewed as a cloud.

The measurement projection optical system 70 includes a light source 71, a condenser lens 72, a conical prism 73, and a ring aperture.
A ring aperture plate 74 (not shown), a relay lens 75, a mirror 76, a relay lens 77, a dichroic mirror 78, a mirror 79, a dichroic mirror 80, a dichroic mirror 60, and an objective lens. 11 and 11.

The conical prism 73 is a condenser lens 7
Light from the light source 71 collected by the ring aperture plate 7
The light is focused on the ring opening of No. 4. The ring aperture plate 74 and the fundus Er are in a conjugate position, and the ring aperture plate 74 is
Ring image (not shown) by the light flux that passes through the ring aperture of
Is projected onto the fundus Er.

The reflected light flux of the ring image projected on the fundus Er is the objective lens 11, the dichroic mirror 60, the dichroic mirror 80, the mirror 79, the dichroic mirror 78, the dichroic mirror 91, and the relay lens 5.
An image is formed on the area sensor 18 via the mirror 7, the mirror M2, the relay lens 56, the dichroic mirror 55, the dichroic mirror 92, and the imaging lens 17 to form a ring image.
An arithmetic and control unit 20 which will be described later on the eye refractive power from this ring image
3 calculates and obtains.

The light receiving optical system 90 includes the objective lens 1
1, dichroic mirror 60, dichroic mirror 80, mirror 79, dichroic mirror 7
8, 91, a relay lens 57, a mirror M2, a relay lens 56, dichroic mirrors 55, 92, an image forming lens 17, and an area sensor 18.

The Placido pattern projection system 100 projects a plurality of concentric ring patterns onto the cornea Ec of the eye to be examined, and as shown in FIG. 2, a disc-shaped pattern plate 101 made of a diffusion plate and a plurality of red patterns. An external light emitting diode 102,
It is composed of a visible cut filter 103 and the like.

As shown in FIG. 5, the pattern plate 101 has a circular hole 101a formed in the center thereof.
Nine concentric rings C1 to C9 are formed around 01a. As shown in FIG. 6, the rings C1 to C9 are formed by a white paint layer 101c and a black paint layer 101d applied on the surface 101b of the diffusion plate 101, and the paints 101c, 101d are applied thereto. There is no part.

Further, the pattern plate 101 is formed with two circular marks Q1 and Q2 arranged in the horizontal direction.
These marks Q1 and Q2 are also paints 101c and 101d as above.
Is the unpainted part.

The infrared light emitting diode 102 is composed of each ring C.
1 to C9 and along each ring C1 to C9,
As shown in FIG. 7, they are attached to the PC board 104 at predetermined intervals. The PC board 104 is fixed to the unit base 105, and the surface 104a of the PC board 104 is white and reflects infrared light forward. The unit base 105 is fixed to the lens barrel portion 106 holding the objective lens 11. 107 is a PC board 104 and a visible cut filter 103
It is a reflector placed between and.

The mark projection optical system 120 includes the pattern plate 1
01 and marks Q1 and Q2 formed on the same horizontal plane, and a pair of parallel projection units 121 and 131 arranged on the same horizontal plane. The parallel projection units 121 and 131 include infrared light emitting diodes 122 and 132 and the red light emitting diodes 122 and 132, respectively. Projection lenses 123, 13 for converting the infrared light emitted from the external light emitting diodes 122, 132 into parallel light beams and emitting them toward the marks Q1, Q2.
3 and 3.

Optical axis 1 of parallel projection units 121 and 131
21a and 131a pass through the marks Q1 and Q2 and the cornea Ec of the eye to be examined.
The marks Q1 and Q2 are projected from the infinity distance toward the cornea Ec of the eye to be examined by the parallel light fluxes from the projection lenses 123 and 133. That is, the marks Q1 and Q2 from different distances from the pattern plate 101
Is projected onto the cornea Ec of the eye to be examined.

Case 125 of parallel projection unit 121
Is inserted into a recess 104c of a hole 104b formed in the center of the PC board 104 and fixed to the lens barrel 106 with a screw N. The parallel projection unit 131 is also fixed to the lens barrel portion 106 as described above.

FIG. 8 is a block diagram showing the configuration of the control system of this ophthalmologic apparatus. In FIG. 8, reference numerals 200 and 201 denote first and second frame memories (storage means) for storing the Placido pattern image and the anterior segment image formed on the area sensor 18, and 210 for measurement formed on the area sensor 18. A third frame memory for storing the ring image and the fundus image, 211
Is a memory for temporarily storing data such as measurement results. Reference numeral 202 denotes a monitor for displaying an image formed on the area sensor 18, S1 denotes a placido switch operated when it is desired to display a ring image (image in FIG. 9) on the monitor 202 during measurement of eye refractive power, and S2 denotes left. A selection switch for selecting the eye or the right eye. When the selection switch S2 is operated, the frame memories 200, 2 corresponding to the selected left and right eyes are selected.
The image stored in 01 is read out and the monitor 202
Represented by. An input / output unit 208 controls the input and output of signals.

Reference numeral 203 denotes a data processing unit for extracting the inner ring images Ca to Ci (see FIG. 7) and the mark images Qa, Qb of the images stored in the frame memories 200, 201, and 204 denotes the ring extracted by the data processing unit 203. Image Ca-Ci
Calculate the corneal shape from the ring image Cb
An arithmetic control unit (arithmetic means) for detecting the working distance of the main body 3 from the ratio of the diameter L1 of the lens to the distance L2 between the mark images Qa, Qb and correcting the corneal shape based on this working distance. is there. Further, the arithmetic control unit 204 uses the placido switch S
When 1 is operated, the function as a display means for reading out the images stored in the first and second frame memories 200 and 201 based on the detection of the microswitch 6 and displaying them on the monitor 202, and the function of the microswitch 6 It has a function as mark display means for displaying “L” and “R” (marks) indicating the left and right eyes on the monitor 202 based on the detection.

Then, the Placido pattern projection system 100
, Mark projection optical system 120, and anterior segment observation optical system 10
And the arithmetic control unit 204 constitute a cornea shape measuring device that measures the shape of the cornea.

Further, the arithmetic control unit 204 is the operation unit 2
The printer 206, the recording device 207, and the light sources 21, 51, 7 based on the operation of the switch 05, switches S1, S2, etc.
1, 102, 122, 132 (see FIGS. 3 and 4), the monitor 202, etc. are controlled. Further, the calculation control unit 204 is adapted to calculate the eye refractive power from the ring image projected on the fundus Er. An eye refractive power measuring device is configured by the fixation target projection optical system 50, the measurement projection optical system 70, the light receiving optical system 90, the arithmetic control unit 204, and the like.

The operation unit 205 and the switches S1 and S
2 is provided on an operation panel (not shown) provided on the upper surface of the slide base 2.

Next, the operation of the above embodiment will be described.

First, for example, when measuring the left eye, the main body 3 is moved leftward by operating the joystick 5 so that the objective lens 11 faces the left eye. The micro switch 6 detects the movement of the main body 3 to the left and outputs a left detection signal SL.

Next, the infrared light emitting diode 102 of the Placido pattern projection system 100 and the infrared light emitting diodes 122 and 132 of the mark projection optical system 120 are turned on by operating the switches of the operation unit 205. Further, the light source 21 of the scale projection system 20 is turned on.

When the infrared light emitting diode 102 is turned on, a ring luminous flux of infrared light is emitted from the rings C1 to C9 of the pattern plate 101 through the visible cut filter 103,
This ring light flux is projected on the cornea Ec of the subject's eye to form a ring reflection image.

Similarly, the infrared light emitting diodes 122, 13
The infrared light emitted from 2 is converted into a parallel light flux by the projection lens and irradiates the marks Q1 and Q2, and is converted into a circular parallel light flux by the marks Q1 and Q2 and is projected onto the cornea Ec of the eye to be inspected to form a small circular mark. A reflection image is formed.

Then, the light fluxes of the ring reflection image and the mark reflection image due to the reflection of the cornea Ec of the eye to be examined are the objective lens 1
1, dichroic mirror 60, mirror 13, relay lens 14, dichroic mirror 15, relay lens 16,
The image is formed on the area sensor 18 together with the anterior segment image through the dichroic mirror 92 and the image forming lens 17. Then, as shown in FIG. 9, the anterior segment image Ea is displayed on the monitor 202.
Together with the ring reflection image Ca which is a Placido pattern image
Ci and mark reflection images Qa and Qb are displayed.

On the monitor 202, the letter "L" indicating that the left eye is being measured by the detection signal SL of the microswitch 6 is displayed at the lower left of the screen.

Further, since the scale image is formed on the area sensor 18 by turning on the light source 21 of the scale projection system 20, the scale image P is also displayed on the monitor 202.

While inspecting the scale image P and the ring reflection image Ca displayed on the monitor 202, the examiner moves the main body 3 vertically and horizontally so that the intersection point Pa of the scale image P is located at the center of the ring reflection image Ca. Then, alignment in the XY directions is performed. Further, the apparatus main body is moved in the front-rear direction so that the mark reflection images Qa and Qb and the ring reflection image Cb substantially coincide with each other, and Z is moved.
Perform directional alignment.

Since the marks Q1 and Q2 are projected from infinity, the distance L2 between the mark reflection images Qa and Qb is constant regardless of the distance in the Z direction of the apparatus body, while the ring reflection image is the same. Since the diameter L1 of Cb changes depending on the distance in the Z direction, by comparing the distance L2 between the mark reflection images Qa and Qb with the diameter L1 of the ring reflection image Cb, Z
The directional alignment can be adjusted and the working distance can be determined.

In this way, the scale image P is displayed on the monitor 202.
Is displayed, alignment can be performed by looking at the scale image P, which is very easy to perform.

When these alignments are completed and the measurement switch (not shown) of the operation unit 205 is pressed, the micro switch 6 outputs the left detection signal SL,
The image shown in FIG. 9, that is, the anterior segment image Ea and the ring reflection image Ca
~ Ci, the letter "L" indicating the left and right eyes, etc. is the frame memory 20.
Stored in 0.

Next, the main body 3 is moved to the right by operating the joystick 5 so that the objective lens 11 faces the right eye. The micro switch 6 detects the movement of the main body 3 to the right and outputs a right detection signal SR.

Then, when the measurement switch is pressed after the alignment is performed in the same manner as described above, the image of the right eye similar to that in FIG. 9 is stored in the frame memory 201 by the right detection signal SR of the microswitch 6.

After that, when the eye refractive power is measured, the light emitting diodes 102, 122 and 132 are turned off. Then, for example, to measure the left eye, the main body 3 is moved to the left by operating the joystick 5. This movement causes the microswitch 6 to output the left detection signal SL.

After performing the alignment in the same manner as described above (in this case, alignment is performed by positioning the intersection point Pa of the scale image P at the center of the pupil image), the light source 21 is turned off and the fixation target projection optical system 50 is turned on. The light source 51 is turned on to project the fixation target on the fundus Er, and the eye E to be examined is directed in a predetermined direction and is viewed as a cloud. Then, the light source 71 of the measurement projection optical system 70 is turned on, and the measurement projection optical system 70 projects a measurement ring image (not shown) on the fundus Er.

The reflected light flux of the measurement ring image is formed on the area sensor 18 of the light receiving optical system 90, and the monitor 18 displays the measurement ring image (not shown) together with the fundus image. Further, the letters "left" are displayed on the monitor 18 based on the detection signal SL detected by the microswitch 6.

When the measurement switch of the operation unit 205 is pressed, the measurement ring image is stored in the third frame memory 210 together with the fundus image displayed on the monitor 18, and the data processing unit 203 is stored in the third frame memory 210. A measurement ring image is extracted from the stored image, and the arithmetic control unit 20
The eye refractive power is calculated from the measurement ring image extracted by 4 and stored in the memory 211 and displayed on the monitor 18.

When it is desired to confirm the Placido pattern image during the measurement of the eye refractive power, the switch S1 is pressed. When the switch S1 is pressed, the image of the left eye stored in the first frame memory 200 is read because the microswitch 6 outputs the left detection signal SL, and the image shown in FIG. Is displayed.

When the switch S1 is pressed again, the image of the right eye stored in the second frame memory 201 is displayed on the monitor 202. Further, when the switch S1 is pressed, the fundus image formed on the area sensor 18 is displayed.

Similarly, if the switch S1 is operated during the measurement of the right eye, the micro switch 6 outputs the right detection signal SR because the main body 3 is moved to the right. The image of the right eye stored in is read and displayed on the monitor 202. Then, when the switch S1 is pushed twice or three times, the left eye image is read from the first frame memory 200 and displayed on the monitor 202 at the second time, and the image is formed on the area sensor 18 at the third time. The displayed fundus image is displayed.

As described above, when the switch S1 is operated during the measurement of the eye refractive power, the first frame memory 2 corresponding to the left eye or the right eye being measured by the first operation.
00 or the image of the left eye or the right eye is read from the second frame memory 201 and displayed on the monitor 202 as shown in FIG. 9, so that the Placido pattern image of the left eye or the right eye being measured, etc. It is very convenient and easy to use.

By the way, on the monitor 18, in addition to the displayed anterior segment image Ea and fundus image, the letters "L" and "R" indicating whether the image is for the left eye or the right eye are also displayed. So
When the image displayed on the monitor 18 is printed out, it is possible to know whether the printed image is for the left eye or the right eye, and the right and left eyes will not be mistaken later.

When the measurement of the eye refractive power of both eyes is completed, the data processing unit 203 operates the operation unit 205 to extract the ring reflection images Ca to Ci from the images stored in the first and second frame memories 200 and 201. And mark reflection image Qa, Qb
Based on the extracted reflection images Ca to Ci, Qa, and Qb, the arithmetic control unit 204 extracts the diameter L1 of the ring reflection image Cb.
And the distance L2 between the mark reflection images Qa and Qb are calculated, and the working distance of the apparatus main body is calculated from this ratio. Then, the difference between this working distance and the preset working distance, that is, the alignment error in the Z direction is calculated.

Further, the arithmetic control unit 204 obtains the corneal shape from the ring reflection images Ca to Ci and corrects the corneal shape according to the above error. By this correction, an accurate corneal shape can be obtained even if the alignment in the Z direction is not accurately performed.

As described above, even if the corneal shape measuring device is integrated with the eye refractive power measuring device, the plactide pattern is projected on the left and right eyes and the plactide pattern images for the left and right eyes are stored in the first and second frame memories. Since it can be stored in 200 and 201, the eye refractive power of the left and right eyes can be promptly measured thereafter. Moreover, after this measurement, the corneal shapes of the left and right eyes can be obtained based on the images stored in the first and second frame memories 200 and 201, so that the demand of the examiner can be satisfied.

Further, when the left or right eye is selected by operating the selection switch S2 after the measurement of the eye refractive power, it is stored in the first and second frame memories 200 and 201 corresponding to the selected left and right eyes. The image that has been read is read out, and the placido pattern image is displayed on the monitor 202 together with the anterior segment image Ea, and the placido pattern image can be viewed freely even after the measurement is completed. Very convenient in case.

[0066]

According to the first aspect of the present invention, even if the corneal shape measuring device is integrated with the eye refractive power measuring device, the plactide pattern is projected to the left and right eyes and the plactide pattern for the right and left eyes is projected.
Since the image can be stored in the storage means by identifying the left and right eyes, the eye refractive power of the left and right eyes can be promptly measured thereafter. Moreover, after this measurement, the corneal shapes of the left and right eyes can be obtained based on the images stored in the storage means, so that the demands of the examiner can be satisfied. Also,
If you operate the Plactide switch while measuring eye refractive power,
The left or right eye image that has been set is read from the storage means.
Will be displayed and displayed on the monitor.
Rui can see the Placido pattern image etc. of the right eye,
It is very convenient and easy to use.

[0067]

According to the second aspect of the present invention, when the left or right eye is selected by operating the selection switch after the measurement of the eye refractive power, the first and second eyes corresponding to the selected left and right eyes are selected.
Is read out image stored in the second frame memory, Table placido pattern image on the monitor with the anterior segment image
Is indicated, it is possible after completion of the measurement is also seen freely placido pattern image, which is very convenient when you want to see after measurement of the eye refractive power.

According to the invention of claim 3 , a mark indicating whether the image is for the left eye or for the right eye is displayed on the image displayed on the monitor. Therefore, the image displayed on the monitor is printed. When printing out, it is possible to know whether the printed image is for the left eye or the right eye, and there is no mistake of the left and right eyes later.

[Brief description of drawings]

FIG. 1 is a side view showing an appearance of an ophthalmologic apparatus according to the present invention.

FIG. 2 is a front view of the ophthalmologic apparatus shown in FIG.

FIG. 3 is an optical layout diagram showing the layout of the optical system of the ophthalmologic apparatus of FIG.

FIG. 4 is a sectional view showing a configuration of a Placido pattern projection system.

5 is a front view showing a pattern plate of the Placido pattern projection system of FIG.

FIG. 6 is an enlarged cross-sectional view showing a part of the configuration of the pattern plate of FIG.

FIG. 7 is a front view of a PC board showing an arrangement of infrared light emitting diodes.

FIG. 8 is a block diagram showing a configuration of a control system of the ophthalmologic apparatus.

FIG. 9 is an explanatory diagram showing an image displayed on a monitor.

[Explanation of symbols]

1 stand 6 micro switch (right and left eye detection means) 10 Anterior segment observation optical system 18 area sensor (imaging means) 30 Alignment projection optical system (projection optical system) 100 Placido pattern projection system 200 First frame memory (storage means) 201 Second frame memory (storage means) 202 monitor 203 Arithmetic control unit (arithmetic means) E eye to be examined

─────────────────────────────────────────────────── ─── Continuation of front page (72) Hirohisa Nakao 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Yasuhisa Ishikura 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Kenshi Hayashi 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (56) References JP-A-3-63028 (JP, A) JP-A-5-2629 (JP, A) JP-A-61-209632 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61B 3 / 10-3 / 18

Claims (3)

(57) [Claims] 1. An ophthalmologic apparatus comprising: a main body provided on a pedestal so as to be movable in the front-back and left-right directions with respect to the eye to be inspected, and the main body is provided with a measurement optical system for measuring the refractive power of the eye to be inspected. A Placido pattern projection system provided on the main body for projecting a Placido pattern toward the cornea of the eye to be inspected, and a left / right detection for detecting which of the left and right eyes is being measured
Means, image pickup means provided on the main body for picking up a Placido pattern image by reflection of the cornea, and a placido pattern image provided on the main body and picked up by the image pickup means, based on the detection of the left and right detection means. A storage unit for identifying and storing the left and right eyes, a calculation unit provided in the main body for calculating the corneal shape of the left and right eyes from the Placido pattern images of the left and right eyes stored in the storage unit, and imaged by the imaging unit. Monitor displaying an image
And measuring the refractive power of the subject's eye by the measurement optical system
At this time, the placido pattern stored in the storage means
Placido switch for displaying images on the monitor
When the placido switch is operated, the left / right detection hand
Stored in the storage means when the stage detects the left eye
The left eye Placido pattern image is displayed on the monitor.
When the left / right detecting means detects the right eye,
In front of the Placido pattern image of the right eye stored in the memory
An ophthalmologic apparatus , comprising: display control means for displaying on a monitor . 2. The storage means comprises a first frame memory for storing a Placido pattern image of the left eye and a second frame memory for storing a Placido pattern image of the right eye, and the first and second frames. The ophthalmologic apparatus according to claim 1 , further comprising a selection switch for selecting one of the memories and displaying the image stored in the selected first and second frame memories on the monitor. . When placido pattern image being imaged by the method according to claim 3, wherein said imaging means is displayed on the monitor, even the ones or the left eye of the placido pattern image right eye based on the detection of the left and right eyes detecting means The ophthalmologic apparatus according to claim 1 or 2, further comprising mark display means for displaying a mark indicating whether or not the mark is displayed on the monitor.