JPH04341233A - Ophthalmologic device - Google Patents

Abstract

PURPOSE:To provide the ophthalmologic device which makes premeasurement of an eye to be examined prior to normal measurement and moves a fixation mark to the position where fogging is to be started at the time of the normal measurement according to this premeasurement data. CONSTITUTION:This ophthalmologic device is so constituted that, after the alignment of a measuring optical system to the eye to be examined and the premeasurement of the eye are executed, the normal measurement is made by moving the fixation mark by a fixation mark pulse motor 12 and executing the fogging to the far-viewing state of the eye. An arithmetic control circuit 10 for controlling the above-mentioned measurements is so set as to make the premeasurement at the time of the above-mentioned alignment.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is an ophthalmology clinic in which a pre-measurement is performed before the main measurement of the eye to be examined, and a fixation target is moved to the fog start position at the time of the main measurement based on the data of the pre-measurement. It is related to the device.

0002

BACKGROUND OF THE INVENTION This type of ophthalmological apparatus performs a pre-measurement before the main measurement of the eye to be examined by pressing a measurement switch after aligning the measurement optical system with respect to the eye to be examined.
A method has been proposed in which the fixation target is moved to the fog starting position at the time of the main measurement based on the data of the previous measurement, and then the fog is performed and the main measurement is performed.

0003

[Problems to be Solved by the Invention] By the way, when measuring the eye to be examined, the actual measurement is performed many times and the average value is used as the measurement data, so if the time required from alignment to the actual measurement becomes longer, This may cause fatigue to the subject, causing discomfort to the subject, and reducing measurement accuracy.

[0004] Therefore, in order to avoid causing discomfort to the subject or reducing measurement accuracy when measuring the eye to be examined, the time required for the above-mentioned measurement should be as short as possible.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an optometry device that can shorten the time from alignment to measurement compared to the conventional method.

[0006]

[Means for Solving the Problems] In order to achieve this object, the present invention aligns a measurement optical system with respect to the eye to be examined, and also moves a fixation target to a fog start position based on data of previous measurement of the eye to be examined. In the ophthalmological apparatus, the fixation target is moved by the driving means to a point where the fixation target is moved by the driving means to form a mist in a state where the subject's eye is looking into the distance, and the main measurement is performed. The ophthalmological apparatus is characterized in that the circuit is set to perform pre-measurement from the start of the alignment to before the measurement switch is pressed.

Further, in the ophthalmological apparatus, the control circuit operates the driving means based on the data from the previous measurement between the start of the alignment and the time before the measurement switch is pressed to move the fixation target to the fog start position. It is set to do so.

[0008] Here, the concept of the period from the start of alignment to before the measurement switch is pressed includes the time during alignment, the time before and after the end of alignment, and the time from the end of alignment to before the measurement switch is pressed, etc. included.

[0009]Then, for the second and subsequent movements of the fixation target to the fog start position, the measurement data from the previous time is used.

[0010] As the measurement data before the previous time, the previous measurement data or the previous main measurement data is used.

[0011]

[Operation] According to such a configuration, the control circuit performs the pre-measurement from the start of alignment of the measurement optical system to the eye to be examined until before the measurement switch is pressed.

[0012] Also, the control circuit operates the driving means between the start of alignment of the measurement optical system and the time before the measurement switch is pressed based on the previous measurement data measured during the previous measurement, so that the fixation target is fogged. Move to the starting position.

[0013]The control circuit uses the measurement data before the previous time, that is, the previous measurement data or the previous main measurement data, for moving the fixation target to the fog starting position for the second and subsequent times.

[0014]

[Embodiment] Next, an embodiment of the present invention will be described based on the drawings.

[First Embodiment] FIGS. 1 to 4 show an embodiment of the present invention.

In FIG. 2, 1 is a base of an ophthalmological instrument such as a refractometer for measuring eye refractive power, a keratometer for measuring corneal shape, or a combination thereof; The attached slide table, 3 is a joystick lever that is attached to the slide table 2 so that it can be tilted freely and moves the slide table 2 back and forth, left and right, 4 is the measuring machine body that is attached to the slide table 2, and 5 is a joystick. This is a measurement switch provided on the tech lever 3. By tilting the joystick lever 3, the slide table 2 can be moved back and forth and left and right.

The measurement switch 5 is of a two-step push type, and when in manual mode, the first step at position A, which is pressed down halfway as shown in FIG. 3, allows pre-measurement to be performed; The main measurement is started at the second stage of position B.

Although omitted in FIG. 2, the left eye detection switch 6 shown in FIG. 1 is located between the base 1 and the slide table 2.
and a right eye detection switch 7 are interposed. In Figure 1, M
S is a mode changeover switch between manual measurement mode and automatic measurement mode, and P is a print switch.

An observation optical system (not shown) and a measurement optical system (not shown) are provided within the measuring instrument main body 4. Further, the measuring device main body 4 has an objective lens (not shown) on the front surface and a monitor TV 8 on the rear surface.

The image of the eye to be examined guided by the measurement optical system is focused on a light receiving element 9 such as an area CCD, and the output signal from this light receiving element 9 and the signals from the switches 5, 6, and 7 are sent to an arithmetic control circuit 10. is input. This arithmetic control circuit 10 is
The measurement results are input into the memory 11. Further, in the arithmetic control circuit 10, a fixation target control signal is input to a pulse motor 12 (driving means) for driving the fixation target, and an image signal is input to a display device such as a monitor TV 8. Furthermore, the arithmetic control circuit 10 controls the printer 13 to print out the measurement results.

When the eye to be examined (not shown) is placed in front of the objective lens of the measurement optical system and a power source (not shown) is turned on, the arithmetic control circuit 10 starts measurement work. At this time, a bright spot is projected onto the eye to be examined via the measurement optical system so as to coincide with the optical axis of the eye to be examined.

Accordingly, a bright spot image from the eye to be examined and an image of the anterior segment of the eye to be examined, which coincide with the optical axis of the eye to be examined, are formed on the light receiving element 9 . Based on the signal from the light receiving element 9, the arithmetic control circuit 10 displays a bright spot image M1 from the eye to be examined and an anterior segment image P of the eye to be examined that coincides with the optical axis of the eye to be examined on the monitor TV8, and at the same time displays a 3 mm An inner reference scale M2 of 6 mm and an outer reference scale M3 of 6 mm are displayed concentrically at the center of the monitor TV8.

In this state, alignment with respect to the eye to be examined is performed by moving the measuring device main body 3 back and forth, left and right, and up and down.

In this alignment, the measuring device main body 4 is moved left and right by operating the joystick lever 3 left and right, and the measuring device main body 4 is moved up and down by well-known means (not shown). With this operation,
The bright spot image M1 displayed on the monitor TV8 is moved left, right, up and down on the screen. Then, when the bright spot image M1 is located at the center of the inner reference scale M2, the horizontal and vertical alignments are completed.

Furthermore, when the joystick lever 3 is operated back and forth to move the measuring device main body 4 back and forth, the monitor T
The clarity of the bright spot image M1 displayed on V8 is changed on the screen. Then, in a state where the bright spot image M1 is clearly projected, the front and rear alignments are completed.

Next, an example of control of this arithmetic control circuit 10 will be explained using FIG. 4.

(Automatic measurement mode) Step S1 In this step, it is determined whether the mode selected by the mode changeover switch MS is manual measurement mode or not. If it is manual measurement mode, the process moves to step S2 and automatic measurement is started. If it is the mode, the process moves to step S12.

Steps S2 and S3 In the automatic measurement mode, when alignment with respect to the eye to be examined is performed as described above by operating the joystick lever 3, arithmetic processing associated with the alignment work is performed in step S2, and the process proceeds to step S3.

In step S3, based on the calculation result in step S2, it is determined whether or not the above-mentioned front-to-back, left-right, and top-down alignments have been completed, and completion (OK) is determined.
), proceed to step S4; if not completed,
Return to step S1 and loop.

During such alignment work, the bright spot image M
1 is located at the center of the inner reference scale M2, the arithmetic control circuit 10 pre-measures "how much power (eye refractive power) the eye to be examined has" and stores the measurement result in the memory 11. .

Step S4 In this step, the system waits for the measurement switch 5 to be pressed, and when the measurement switch 5 is pressed, the process moves to step S5.

Step S5 Here, the pulse motor 12 is driven and controlled based on the results of the previous measurement stored in the memory 11, and the fixation target (not shown) is moved to a range visible to the subject's eye (fog starting position). After that, the process moves to step S6.

Step S6 In this main step, the pulse motor 12 is driven and controlled to move the fixation target from the visible position in the direction of cloud vision, so that the eye to be examined is looking at an infinite distance, and in step The process moves to S7.

Step S7 In this step, when the eye to be examined is made to look at an infinite distance, the accurate refractive power S, astigmatic power C, astigmatic axis A, etc. of the eye to be examined are measured, and the process moves to step S8. .

Step S8 In this step, it is determined whether the eye being measured is the left eye or the right eye based on the signals from the switches 5 and 7. If the eye is the left eye, the process moves to step S9, and if the eye is the right eye. If so, the process moves to step S9'. Here, in reality, it is determined whether the eye to be measured is the left eye or the right eye, either before or after step S1, and if the eye is the left eye, a flag "1" is set, and if the eye is the right eye, the flag is set to "1". Alternatively, the flag may be set to "0", and it is determined in this step whether the flag is "1" or not, and the process proceeds to step S9 or step S9'.

The left and right eyes may be determined from the image of the eye to be examined formed on the light-receiving element 9.

Steps S9 and S9' In step S9, the left result (result for the left eye) is stored in the memory 11 and displayed on the monitor TV 8, and in step S9', the right result (result for the right eye) is stored in the memory 11. The information is stored and displayed on the monitor TV8, and the process moves to step S10.

Steps S10, S11 In this step, it is determined whether the print switch P has been pressed and turned on. If it has not been pressed, the process moves to step S101, and if it has been pressed, the process moves to step S11. Print out the measurement results using the printer 13,
Finish the measurement.

Step S101 In step S101, it is determined whether or not the image of the eye to be examined formed on the light receiving element 9 has moved. If the eye to be examined has not moved, the process returns to step S10 and loops; if the eye has moved, the image is moved. Returning to step S1, the second measurement is started.

(Manual measurement mode) Step S12
If it is determined in step S1 that the mode is manual measurement mode, the process moves to this step.

[0041] In this step, the joystick lever 3
When alignment with respect to the eye to be examined is performed as described above by operating , arithmetic processing associated with the alignment work is performed and the process moves to step S13.

Steps S13, S14 In this step, it is determined whether or not the measurement switch 5 has been pressed one step. If it has been pressed one step, the process moves to step S14 and pre-measurement is performed in the same manner as step S2. If not, the process moves to step S15.

Step S15 In this step, it is determined whether or not the measurement switch 5 has been pressed two times. If it has been pressed two times, the process moves to step S5 and the processes from step S5 onwards are executed. If not, the process returns to step S12 and loops.

[Second Embodiment] FIG. 5 shows a second embodiment of the present invention.

In the first embodiment described above, step S
Although the example in which only pre-measurement is performed at the same time as alignment processing is shown in 2, the present invention is not necessarily limited to this.

For example, as shown in FIG.
Pre-measurement is performed at the same time as alignment processing is performed in step S2', and a fixation target (not shown) is moved to a range visible by the subject's eye (fog starting position) based on the pre-measurement in step S2'. Step S5 may be omitted.

Further, in step S14 of the first embodiment, only the pre-measurement is performed, but as shown in FIG. 5 of the present embodiment, in step S14, the pre-measurement is performed and Based on this, a fixation target (not shown) may be moved to a range visible by the subject's eye (fog starting position).

[Third Embodiment] FIGS. 6 and 7 show a third embodiment of the present invention.

In step S101 of the first and second embodiments, if the image of the eye to be examined formed on the light-receiving element 9 is moving, the process is set to return to step S1 and loop. However, the present invention is not necessarily limited to this. It's not something you can do.

For example, the configuration shown in FIGS. 6 and 7 may be used.

That is, in step S10 in FIG. 6, it is determined whether or not the print switch P has been pressed and turned on. If it has not been pressed, the process moves to step S101' in FIG. 7, and if it has been pressed, the process in FIG. The process moves to step S11, where the measurement results are printed out using the printer 13, and the measurement is completed.

In step S101' in FIG. 7, it is determined whether the image of the eye to be examined formed on the light receiving element 9 has moved, and if the eye to be examined has not moved, the process returns to step S10 in FIG. 6 and loops. , if it is moving, the process moves to step S31.

Steps S31 to S33 In step S31, it is determined whether or not the left eye is being measured, and if it is the left eye, the process moves to step S32.
If it is the right eye, the process moves to step S33. In step S32, it is determined whether the number of left eye measurements is one or more, and in step S33 it is determined whether the number of right eye measurements is one or more. Then, in steps S32 and S33, if it is determined that it is the first time ("0" time), the process returns to step S1 in FIG. The process moves to S34.

Step S34 In this step, it is determined whether or not it is the manual measurement mode. If it is the manual measurement mode, step S1 in FIG.
The process loops back to step S35, and if the mode is not the manual measurement mode but the automatic measurement mode, the process moves to step S35.

Step S35 In this step, it is determined whether or not the above-mentioned alignment has been completed. If not, the process loops until the alignment is completed, and if it is determined that the alignment has been completed, the process moves to step S36. .

Steps S36 and S37 In step S36, the process waits for the measurement switch 5 to be pressed, and when it is pressed, the process moves to step S37.

In step S37, the pulse motor 12 is driven and controlled based on the measurement data based on the previous main measurement to move the fixation target (not shown) to a range visible to the subject's eye (fog starting position), and then The process moves to step S6 of step S6.

[Fourth Embodiment] FIG. 8 shows a fourth embodiment of the present invention.

In the embodiment shown in FIGS. 6 and 7, an example was shown in which only pre-measurement was performed at the same time as the alignment process in step S2, but the invention is not necessarily limited to this.

For example, as shown in FIG.
At the same time as alignment processing is performed, a pre-measurement is performed, and in step S2, a fixation target (not shown) is moved to a range visible to the subject's eye (fog starting position) based on the pre-measurement, and step S5 of the first embodiment is performed. It may be omitted.

Further, in step S14 of the third embodiment, only the pre-measurement is performed, but as shown in FIG. 8 of the present embodiment, in step S14, the pre-measurement is performed and Based on this, a fixation target (not shown) may be moved to a range visible by the subject's eye (fog starting position).

[0062] In the embodiment described above, a case has been shown in which the pre-measurement and the movement of the fixation target to the fog start position are performed during alignment, but the present invention is not necessarily limited to this. That is, the pre-measurement and the movement of the fixation target to the fog start position may be carried out at any time from the start of alignment to before the measurement switch 5 is pressed. Here, from the start of alignment, measure switch 5
The concept of the period before the button is pressed includes, in addition to the time during the alignment in the above embodiment, the time before and after the end of the alignment, the time from the end of the alignment until before the measurement switch is pressed, etc.

[0063]

[Effect] As explained above, the control circuit that controls measurement is configured to perform pre-measurement from the start of alignment to before the measurement switch is pressed. The time required for measurement can be shortened, fatigue of the eye being examined can be reduced, and accurate measurements can be made.

[0064] The control circuit is also set to operate the drive means based on the data from the previous measurement between the start of alignment and before the measurement switch is pressed to move the fixation target to the fog start position. With this configuration, the fixation target can be moved to the fog start position during alignment, and the fog can be started immediately after alignment to perform the main measurement, so even elderly people with slow reaction times can take measurements in advance. The eye to be examined can be seen at the fixation target before operating the switch, and the subject's eye can be adjusted to the fixation target, which prevents the subject's eye from becoming tired before starting the actual measurement and making accurate measurements impossible. can.

Furthermore, if the measurement data before the previous time is used to move the fixation target to the cloud starting position from the second time onwards, the time required for alignment is reduced because pre-measurement is not required for each alignment. By shortening the measurement time, the total measurement time can be further shortened, and the fatigue of the eye to be examined can be further reduced.

Furthermore, if the measurement data before the previous time is the previous measurement data, the fog start position is always constant, so the processing time for moving the fixation target to the cloud start position is extremely shortened. Even children who are always restless can measure the eye to be examined in a short time.

[0067] Furthermore, if the previous measurement data is the previous main measurement data, the fixation target can be accurately moved to the fog start position using the accurate previous measurement data. This is advantageous when measurements are required.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram showing an embodiment of an ophthalmologic apparatus according to the present invention.

FIG. 2 is a schematic perspective view of an ophthalmological apparatus having the control circuit shown in FIG. 1;

3 is an enlarged explanatory view of the joystick lever shown in FIG. 2. FIG.

FIG. 4 is a flowchart of the ophthalmological apparatus shown in FIGS. 1-3.

FIG. 5 is a flowchart showing a second embodiment of the ophthalmologic apparatus according to the present invention.

FIG. 6 is a flowchart showing a third embodiment of the ophthalmologic apparatus according to the present invention.

FIG. 7 is a flowchart branching from the flowchart shown in FIG. 6;

FIG. 8 is a flowchart showing a fourth embodiment of the ophthalmologic apparatus according to the present invention.

[Explanation of symbols]

5...Measurement switch 8...Monitor TV (display device) 9... Light receiving element 10... Arithmetic control circuit 12...Pulse motor (drive means)

Claims (8)

[Claims] 1. After aligning the measurement optical system with respect to the eye to be examined and moving the fixation target to the fog start position by the driving means based on the data of the previous measurement of the eye to be examined, the fixation target is moved to the driving means. In the ophthalmological apparatus, which performs the main measurement by moving the mist so that the subject's eye is looking into the distance, the control circuit that controls the measurement is operated from the start of the alignment until before the measurement switch is pressed. An ophthalmological device characterized in that the ophthalmological device is configured to perform a pre-measurement. 2. The control circuit is configured to operate the driving means based on data obtained from previous measurements between the start of the alignment and before the measurement switch is pressed to move the fixation target to a fog start position. The ophthalmologic apparatus according to claim 1, wherein the ophthalmologic apparatus is configured to 3. The ophthalmologic apparatus according to claim 1, wherein the control circuit performs pre-measurement during alignment. 4. The control circuit according to claim 1 or 2, wherein the pre-measurement is performed before and after the end of alignment.
The ophthalmological device described in . 5. The ophthalmologic apparatus according to claim 1, wherein the control circuit performs the pre-measurement from the end of alignment to before a measurement switch is pressed. 6. The ophthalmological apparatus according to claim 1, wherein measurement data from previous times is used for moving the fixation target to the fog start position from the second time onwards. 7. The ophthalmologic apparatus according to claim 6, wherein the previous measurement data is previous measurement data. 8. The ophthalmologic apparatus according to claim 7, wherein the previous measurement data is previous measurement data.