JP2012005904A - Eye adjustment function state measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an eye adjustment function state measuring device which reduces burdens put on both of a subject and an operator and is easier to use.SOLUTION: Measurement can be stopped in the middle by a middle stop part 65d as needed while viewing display of a measurement middle result by a measurement middle result display part 65g and display by an astigmatism component change display part 65f, and consequently useless measurement is prevented. Also, an initial position correction part 65a, an end position correction part 65b and a measurement time correction part 65c are provided so as to facilitate the change of measurement conditions. Further, a sound reproduction part 65e is provided so as to recognize the progress of the measurement and relax the subject. Further, by providing a data processing part 65h and an information retrieval part 65i, the management of a measurement result is facilitated and burdens on a measurer are reduced.

Description

  The present invention relates to an eye accommodation function state measuring apparatus that measures an eye accommodation function state of an eye to be examined.

In the optometry and eye refraction examinations, it has been desired to grasp the accommodation function state of the eye. For example, an objective eye such as the eye accommodation function state measurement device described in Patent Document 1 is desired. Devices have been proposed for measuring the adjustment function.
According to Patent Document 1, this eye accommodation function state measurement is performed by continuously measuring eye refractive power similar to a conventional eye refractive power measurement method (for example, the method of Patent Document 2), and measuring a plurality of refractive powers. The eye accommodation function state is measured by calculating a high-frequency component of refractive power from the value. The continuous measurement is performed for about 20 seconds as one step, and a plurality of positions (for example, about 8 steps at 8 locations) are measured while moving the target position.

In the conventional eye accommodation function state measurement, if one step measurement is performed in 20 seconds and 8 steps are performed, the measurement is performed for 160 seconds in total. During the measurement, the subject needs to stare at the target, and when the measurement takes such a long time, there is a problem that the tension of the subject increases more than usual.
In addition, continuing to watch for 160 seconds itself has the problem of forcing the subject to suffer.
Further, as a problem for the operator, since the result comes out after measurement for 160 seconds, the data required for calculating the state of the eye adjustment function is, for example, that the eye has moved or that many blinks have been performed. Even if there is a shortage, there is a problem that the measurement is continued until the end because it is unknown, and if there is a measurement error, the measurement must be repeated from the beginning.
Furthermore, if the results are saved and stored as a file for each measurement, the number of files becomes enormous. For example, it is necessary to collect information on subjects with abnormal eye accommodation function status. There is a problem that it is very difficult to extract and reuse the measurement results. And since previous measurement results cannot be easily reused, measurement cannot be started under the optimal conditions for the subject, and trial and error will be repeated, which burdens both the subject and the operator. There was a problem that it may become large.

JP 2003-70740 A JP-A-6-165757

  The subject of this invention is reducing the burden concerning both a subject and an operator, and providing an eye adjustment function state measuring apparatus which is easier to use.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
The first invention is a target projection unit (62) that projects a target (62a) onto the eye (60) to be examined, and a target movement that moves the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. The eye adjustment function state measurement device (51) includes an end position correction unit (65b) that changes the position of the target at the end of measurement.
The second invention is a target projection unit (62) for projecting a target (62a) to the eye to be examined (60), and a target movement for moving the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. The eye adjustment function state measurement device (51) further comprises a measurement time correction unit (65c) that changes a time for performing the eye adjustment function state measurement for each of the plurality of positions of the visual target.
The third invention is a target projection unit (62) for projecting a target (62a) to the eye to be examined (60), and a target movement for moving the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. The eye accommodation function state measuring device (51) is characterized by comprising a midway stop (65d) capable of stopping the measurement operation halfway regardless of the progress of measurement of the eye accommodation function state. .
According to a fourth aspect of the present invention, in the eye accommodation function state measuring apparatus according to the third aspect, the midway stop unit (65d) can restart the measurement of the eye accommodation function state that has been stopped halfway from the stopped state. This is an eye accommodation function state measuring device (51).
According to a fifth aspect of the present invention, in the eye accommodation function state measuring apparatus according to the third aspect, the midway stop unit (65d) can end the measurement of the eye accommodation function state stopped halfway in the stopped state. There is an eye accommodation function state measuring device (51) characterized by being.
6th invention is the eye accommodation function state measuring apparatus of 5th invention. WHEREIN: When the measurement of the eye accommodation function state is restarted from the beginning after the measurement of the eye accommodation function state is interrupted on the way, it is measured again. An eye adjustment function state measurement device (51) comprising an initial position correction unit (65a) capable of correcting the position of the target at the start.
According to a seventh invention, in the eye accommodation function state measurement device according to the sixth invention, when the position of the target at the start of measurement is corrected by the target initial position correcting unit (65a), the measurement at the end of the measurement is performed. An end position correction unit (65b) that automatically and / or manually changes the position of the target according to the target position corrected by the target initial position correction unit is provided. It is an eye accommodation function state measuring device (51).
The eighth invention is a target projection unit (62) for projecting a target (62a) to the eye to be examined (60), and a target movement for moving the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. The eye adjustment function state measuring device (51) is provided with an audio reproduction unit (65e) for reproducing audio and / or music during measurement.
According to a ninth aspect of the present invention, in the eye accommodation function state measurement device according to the eighth aspect, the sound reproduction unit (65e) reproduces sound and / or music for each of the plurality of positions of the target (62a). It is an eye accommodation function state measuring device (51) characterized by these.
According to a tenth aspect of the present invention, in the eye accommodation function state measuring apparatus according to the eighth or ninth aspect, the sound and / or music reproduced by the sound reproduction unit (65e) is the plurality of positions of the target (62a). The measurement end time for each position where the measurement ends every time, or the length that matches the total measurement end time at which the measurement at all target positions from the measurement start position to the measurement end position of the target ends. There is an eye accommodation function state measuring device (51) characterized by being.
According to an eleventh aspect of the present invention, in the eye accommodation function state measurement device according to any of the eighth to tenth aspects, the sound and / or music reproduced by the sound reproduction unit (65e) is the target (62a). The measurement progress of each of the plurality of positions and / or the measurement progress at all the target positions from the measurement start position to the measurement end position of the target are contents that can be grasped. It is an eye accommodation function state measuring device (51).
A twelfth aspect of the invention is a target projection unit (62) that projects a target (62a) onto the eye (60) to be examined, and a target movement that moves the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. And an astigmatism component change display unit (65f) for displaying a change in the astigmatism component of the subject due to the change in the target position.
A thirteenth invention is a target projection unit (62) for projecting a target (62a) to the eye to be examined (60), and a target movement for moving the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. In each of the above-mentioned eye adjustment function states for each target position, the measurement result display unit (displaying the measurement result in a state where the measurement of the eye control function state at the next target position is continued) 65 g), an eye accommodation function state measuring device (51).
A fourteenth aspect of the invention is a target projection unit (62) that projects a target (62a) onto the eye (60) to be examined, and a target movement that moves the position of the target along the optical axis direction of the eye to be examined. An eye adjustment function state measuring device for measuring an eye accommodation function state that is a change in refractive power of a high-frequency component of the eye to be examined at the plurality of positions by arranging the target at a plurality of positions by the target movement mechanism. A data processing unit (65h) which additionally stores a data unit including at least a part of a measurement value obtained by measurement of the eye accommodation function state according to a predetermined format as one database, and the data processing And an information retrieval unit (65i) capable of extracting necessary information selected from the database stored by the unit.
A fifteenth aspect of the present invention is the eye accommodation function state measuring apparatus according to the fourteenth aspect, wherein the data processing unit (65h) is a data unit not included in the database stored by the data processing unit, An eye accommodation function state measuring device (51) characterized in that it can read and / or process data including at least part of information obtained by state measurement.

According to the present invention, the following effects can be obtained.
(1) Since an end position correcting unit that changes the position of the target at the end of measurement is provided, for example, when more measurement data is desired, it is possible to respond flexibly and improve usability.

(2) Since the measurement time correction unit that changes the time for performing the eye accommodation function state measurement for each position of the target is provided, the measurement time can be shortened when the subject is a child or the like, and the burden on the subject Can be reduced.

(3) Since there is a midway stop part that can stop the measurement operation halfway regardless of the measurement progress state of the eye accommodation function state, it stops without continuing unnecessary measurement when there is a mistake in the measurement, etc. Or can be stopped for a break, reducing the burden on the subject.

(4) Since the midway stop unit can restart the measurement of the eye accommodation function that has been stopped halfway, it can be restarted from the stopped state. Can be reduced.

(5) The midway stop unit can stop the measurement of the state of the eye accommodation function that has been stopped halfway in the middle of the stoppage, so that the unnecessary measurement is continued and the burden on the subject is increased. Can be prevented.

(6) Since the measurement of the eye accommodation function state is stopped halfway, when the measurement of the eye accommodation function state is performed again from the beginning, an initial position correction unit is provided that can correct the position of the target at the start of the measurement. Further, it is possible to select a more optimal initial position by judging from the measurement results performed halfway, and it is possible to prevent repeated unnecessary measurements.

(7) When the target position at the start of measurement is corrected by the target initial position correction unit, the target position at the end of measurement is automatically adjusted according to the target position corrected by the target initial position correction unit In addition, since the end position correction unit that is manually changed is provided, even when the initial position of the target is changed, the same amount of measurement data as that when the target is not changed can be obtained.

(8) Since the voice playback unit that plays back the voice and / or music during the measurement is provided, the subject can be relaxed.

(9) Since the sound reproduction unit reproduces sound and / or music for each of a plurality of positions of the target, the progress of measurement can be grasped. Therefore, the subject can know how much time to endure and can have a mental margin.

(10) The sound and / or music reproduced by the sound reproduction unit is the measurement end scheduled time for each position where the measurement is completed at each position of the target, or all of the target from the measurement start position to the measurement end position. Since the length is adjusted to the total scheduled measurement end time at which the measurement at the target position is completed, the progress of the measurement can be grasped more accurately. Therefore, the subject can know how much time to endure and can have a mental margin.

(11) The sound and / or music reproduced by the sound reproduction unit may be measured at each target position from the measurement start position to the measurement end position. Since the progress of the measurement can be grasped, the subject can know how much time should be put up and can have a mental margin.

(12) Since the astigmatism component change display unit that displays the change in the subject's astigmatism component due to the change in the target position is provided, the change in the eye accommodation function state can be compared with the change in the astigmatism component.

(13) Each time the measurement of the eye accommodation function state for each target position is completed, a measurement intermediate result display section for displaying the measurement result in a state where the measurement of the eye accommodation function state at the next target position is continued. Therefore, it can be grasped during the measurement whether or not the measurement is correctly performed, and it can be determined whether or not the measurement needs to be interrupted. Therefore, it is possible to prevent the measurement from being continued unnecessarily, and the burden on the subject can be reduced.

(14) A data unit including at least a part of a measurement value obtained by measuring the state of the eye accommodation function is additionally stored according to a predetermined format to be one database, and is stored by the data processing unit. Since the information retrieval unit that can extract the necessary information selected from the database is provided, the measurement data can be used effectively. In addition, data management becomes easy and the burden on the measurer is reduced.

(15) The data processing unit is a data unit that is not included in the database stored by the data processing unit, and that reads data including at least a part of information obtained by measuring the eye accommodation function state; and Since the process can be performed, the data of the subject measured at another place can be used. Therefore, useless measurement can be reduced and the burden on the subject can be reduced.

It is a block diagram of the eye accommodation function state measuring apparatus 51 of Example 1 of this invention. It is a figure which shows the striped pattern of the chopper 61a. 6 is a flowchart showing an eye accommodation function state measurement operation executed by a control unit 65. It is a flowchart which shows the operation | movement (S100) of a far point position D0 measurement. It is a flowchart which shows the operation | movement (S500) of this measurement of an eye accommodation function state measurement. 6 is a flowchart showing an operation of monitoring a temporal change in eye refractive power during a predetermined time T and calculating an appearance frequency of a high frequency component in S530 of FIG. It is a figure explaining an analysis procedure (S533). It is a figure which shows the example which displayed the measurement result of the eye accommodation function state in Example 1. FIG. It is a block diagram of the eye accommodation function state measuring apparatus of Example 2 of this invention. 10 is a flowchart showing a preparation process before the measurement device body 151 starts measurement. 5 is a flowchart showing a measurement operation of the measurement apparatus main body 151. It is a flowchart which shows the operation | movement (S1100) of a far point position D0. It is a flowchart which shows the operation | movement (S1500) of this measurement of the eye accommodation function state measurement of the measuring device main body 151. FIG. 5 is a flowchart showing the main measurement operation of the eye accommodation function state measurement of the data processing device 200.

(Example 1)
Embodiment 1 of the present invention will be described below with reference to the drawings.
FIG. 1 is a configuration diagram of an eye accommodation function state measuring apparatus 51 according to the first embodiment of the present invention. The apparatus used in the present invention uses the detection method as the principle of measurement.
The eye accommodation function state measurement device 51 includes a refraction measurement unit 61, an image projection unit 62, a dichroic mirror 63, a control unit 65, a display unit 66, a storage unit 69, and the like.

  In the projection unit 62, a convex lens 62c, a visual target 62a, and a light source 62b are arranged in this order from the side closer to the eye 60 (near). Since the light beam from the target 62a illuminated by the light source 62b is converted into a state similar to a parallel light beam by the convex lens 62c and then enters the eye 60, when viewed from the eye 60, the position of the target 62a is actually It seems to be far from the position of. Among these, the target 62a and the light source 62b can be moved in the optical axis direction of the eye 60 by a target moving mechanism (not shown) and a motor 62d in a state where the mutual positional relationship is unchanged.

FIG. 2 is a diagram showing a striped pattern of the chopper 61a.
Returning to FIG. 1, the refraction measuring unit 61 includes a chopper 61a having a slit, a motor 61i that rotates the chopper 61a, a light source (infrared light source) 61b that illuminates the chopper 61a, and stripes formed by the chopper 61a. A lens 61d for projecting the pattern onto the fundus of the eye 60 to be examined, a light receiving unit 61h for detecting the moving speed of a stripe pattern formed by light returning from the fundus of the eye 60 to be examined, a lens 61f, a diaphragm 61g, and the like are provided. In addition, the refraction measuring unit 61 is provided with a lens 61c, a half mirror 61e, and the like.

  The dichroic mirror 63 guides the measurement light (infrared light) emitted from the refraction measurement unit 61 and the measurement light (visible light) emitted from the projection unit 62 to the eye 60 to be examined. Infrared light returning from the light returns to the refraction measuring unit 61. Here, since the chopper 61a rotates in the refraction measuring unit 61, the striped pattern projected on the fundus of the eye 60 to be examined moves. Then, the moving speed of the striped pattern formed on the light receiving unit 61h changes according to the eye refractive power of the eye 60 to be examined. As the striped pattern of the chopper 61a, stripes 71a and 71b of two kinds of directions are formed on the chopper as shown in FIG. 2, and when the chopper makes one turn, the two meridian directions are measured, An eye refractive power such as an astigmatic axis is calculated.

The control unit 65 includes a CPU and a circuit including a memory used for the operation thereof, and refers to a signal output from the light receiving unit 61h, and includes light sources 62b and 61b, motors 62e and 61i, and a display unit. 66 is driven and controlled. The control unit 65 refers to the output while driving the refraction measuring unit 61 (drives and controls the motor 62d while driving the light source 62b), thereby arranging the target 62a (the target 62a and the light source 62b), and Scan the position.
The control unit 65 measures the eye refractive power of the eye 60 to be examined as described above by referring to the output of the light receiving unit 61h while driving the light source 61b, the motor 61i, and the light receiving unit 61h.
Further, the control unit 65 includes an initial position correction unit 65a, an end position correction unit 65b, a measurement time correction unit 65c, a midway stop unit 65d, an audio reproduction unit 65e, an astigmatism component change display unit 65f, a measurement midway result display unit 65g, A data processing unit 65h, an information search unit 65i, and the like are included.

When the initial position correcting unit 65a performs measurement again after the measurement is stopped halfway by a later-described midway stop unit 65d, the initial position correction unit 65a determines from the measurement result displayed halfway by the later-described measurement midway result display unit 65g, This is a part for correcting the initial position of the target 62a. The correction of the initial position may be automatically determined from the intermediate result, or may be corrected by the operator's determination and manual input of the initial position. Moreover, you may correct based on the previous measurement result.
In the measurement of the eye accommodation function state, the position of the visual target 62a is arranged far (initial position) with reference to the pre-measured value of the near vision degree of the eye (at a position of +0.5 Dp (diopter) from the far point position described later). keep away). However, depending on the eye to be examined, it may be very delicate where the reference should be. Originally, it is desired to perform measurement from a region where the eye does not perform focus adjustment, but depending on the eye to be examined, focus adjustment may be performed even at the initial position. In such a case, the initial position is corrected by the initial position correcting unit 65a and the measurement is performed again.

  The end position correcting unit 65b is a part that corrects the position of the target 62a at the end of measurement according to the initial position of the target 62a corrected by the initial position correcting unit 65a. The correction of the end position of the target 62a may be automatically corrected based on the corrected initial position of the target 62a, or may be corrected by manually inputting the end position as determined by the measurer. Good. The end position correction unit 65b corrects the end position of the target 62a, so that even if the initial position of the target 62a is corrected, the same amount of measurement data as before correction (eight steps in the first embodiment) is obtained. be able to.

The measurement time correction unit 65c is a part that changes the time T during which the eye accommodation function state measurement is performed in a state where the visual target 62a is arranged at a specific position.
In the eye accommodation function state measurement apparatus according to the first embodiment, one measurement is performed in 20 steps per step for 8 steps (however, the initial position and the end position of the target 62a are not limited to 8 steps). finish. However, it is difficult for an adult to watch the target 62a during that time. In addition, children often cannot tolerate. Therefore, in the first embodiment, in addition to the above, the measurement time can be selected from one step 10 seconds, one step 5 seconds, and one step 3 seconds so that the measurement time can be changed. In Example 1, the measurement data is multiplied by a coefficient corresponding to the measurement time so that an equivalent measurement result can be obtained even if the measurement time is changed.

The midway stop unit 65d is a part that stops the measurement operation midway regardless of the progress of measurement of the eye accommodation function state. In Example 1, a measurement result is displayed in substantially real time during measurement by a measurement intermediate result display unit 65g described later. Therefore, from the middle of the process, it is possible to know whether the measurement at that time is correctly performed, whether the measurement conditions are appropriate, or the like. If it is not desirable to continue the measurement, the midway stop unit 65d immediately stops the measurement by the operation of the measurer.
When the midway stop unit 65d stops the measurement in the middle, as the subsequent operation, the measurement of the eye accommodation function state stopped in the middle can be resumed from the stopped state or in the stopped state. It can be terminated on the way.

The sound reproducing unit 65e is a part that reproduces sound and music during measurement.
The sound / music reproduced by the sound reproduction unit 65e is the measurement end scheduled time (time T) at which the measurement ends at each position of the target 62a, or from the measurement start position to the measurement end position of the target 62a. By setting the length according to the total measurement end scheduled time (time T × number of steps (step number = 8 in the first embodiment)) at which the measurement at all target positions is completed, every measurement time of the interval The voice or music ends, and the progress of measurement can be grasped.
The sound and music reproduced by the sound reproducing unit 65e are measured at every position of the target 62a from the measurement start position to the measurement end position. The progress can be grasped (for example, a countdown indicating that the measurement is completed within a few seconds).

  The astigmatism component change display unit 65f is a portion that displays a change in the subject's astigmatism component due to a change in the target position. In Example 1, the measurement result of the astigmatism component is displayed for each section.

  The measurement intermediate result display unit 65g displays the measurement result in a state where the measurement of the eye accommodation function state at the next target position is continued every time the measurement of the eye accommodation function state for each target position is completed. It is. In the first embodiment, the measurement result is displayed for each section obtained by further subdividing the measurement time T determined for each target position.

The data processing unit 65h is a part that additionally stores a data unit including at least a part of the measurement value obtained by the measurement of the eye accommodation function state according to a predetermined format as one database.
The information search unit 65i is a part that extracts necessary information selected from the database stored by the data processing unit 65h. For example, it is possible to extract those with astigmatism and refraction values in a specific numerical range, or extract only those with a high frequency appearance frequency higher than a specific value. By having such a database, it is possible to efficiently use target data without searching and searching for a large number of files, and it is possible to effectively use information on a large number of eyes to be examined.
In addition, the data processing unit 65h is a data unit that is not included in the database stored by the data processing unit 65h, and reads data including at least a part of information obtained by measuring the eye accommodation function state. And / or processing can be performed. Therefore, if recorded according to the same format, for example, data of an eye to be examined that has been previously measured in another hospital can be added to the database and used.

Hereinafter, the measurement operation of the eye accommodation function state will be described focusing on the control by the control unit 65.
FIG. 3 is a flowchart showing the eye accommodation function state measurement operation executed by the control unit 65.
When the control unit 65 recognizes that a measurement start button (not shown) has been pressed, in step (hereinafter referred to as “S”) 100, first, as a preparatory measurement before entering the main measurement, the control unit 65 has the subject eye 60. The far point position D0, which is one of the inherent characteristics, is measured. The far point position is the position of the visual target that is most distant from the eye to be examined, and this is measured in order to adapt the contents of this measurement procedure to the characteristics of each eye 60 to be examined. The measurement of the far point position is the same as that performed in general eye refractive power measurement. The operation of S100 will be described in more detail with reference to FIG.

FIG. 4 is a flowchart showing the operation (S100) of the far point position D0 measurement.
In the measurement of the far point position D0, first, in S101, the visual target 62a is moved to the predetermined position D00 and arranged. The predetermined position D00 is a position sufficiently close to the eye 60 to be examined, for example, a position corresponding to a remote position of 30 cm as viewed from the eye 60 (note that the remote position is arranged there). This is about 3.33 Dp (diopter) when expressed by the eye refractive power necessary to image the object. Hereinafter, the position based on the eye 60 is expressed by the eye refractive power in this way).

In S102, the position of the target 62a is gradually scanned far away.
In S103, the change in the eye refractive power of the eye 60 to be examined at that time is monitored. The monitoring timing may be intermittent or continuous. Here, when the eye 60 to be examined can clearly view the visual target 62a (that is, the eye 60 to be adjusted), the eye refractive power follows the scanning of the position of the visual target 62a. However, when the eye 60 cannot clearly see the visual target 62a (that is, the eye 60 does not adjust), the eye refractive power does not follow the scanning of the position of the visual target 62a.

The position where the eye refractive power can no longer follow is the “far point” of the eye 60 to be examined, that is, the farthest position where the eye 60 can be clearly seen. In this specification, the actual placement position of the visual target 62a that appears to be placed at a far point when viewed from the eye 60 is referred to as a “far point position”. While the eye refractive power follows the movement of the visual target 62a, the control unit 65 continues to move the visual target 62a until there is no change in the refractive power of the eye (S102, S103). When the eye refractive power stops following the movement of the target 62a and the eye refractive power is not changed, the process proceeds to S104.
In S104, the position of the target 62a at that time is regarded as the far point position D0 of the eye 60 to be examined, and this far point position D0 is stored in the memory.

Returning to FIG. 3, before performing the main measurement (S500) of the eye accommodation function state measurement, in S200, S300, and S400, the initial position correction, the end position correction, and the measurement are respectively performed as necessary in S200, S300, and S400. The time T is corrected.
In S500, the main measurement of the eye accommodation function state measurement is performed. The operation of S500 will be described in more detail with reference to FIG.

FIG. 5 is a flowchart showing the main measurement operation (S500) of the eye accommodation function state measurement.
In S510, the visual target 62a is arranged at the initial position with reference to the far point position D0. That is, first, the visual target 62a is arranged at a position (D0 + α′0) slightly far from the far point position D0. Note that the position (D0 + α′0) is a position where the target 62a cannot be clearly seen even if the eye 60 is adjusted, but the target 62a is not too blurred. The reason for arranging at such a position (D0 + α′0) is to suppress unnecessary movement of the eye 60 to be examined. Therefore, it is usually preferable that α′0 is about 0.5 Dp. However, this initial position may be inappropriate depending on the eye 60 to be examined. In this case, it is necessary to correct the initial position in S200 described above. The position where the target 62a is placed and the number of times of measurement are displayed on the display unit 66. This is to avoid making it difficult to know where the measurer or the subject is currently measuring because the measurement is performed in 8 steps (positions of the eight targets 62a). At the step, the remaining amount is displayed.

In S520, music playback is started. This music is set so that one song ends in the same time as the measurement time T. The subject and the measurer can grasp the progress of the measurement and listen to the music, and can reduce the tension of the subject. In addition to music, for example, it may be notified by voice of what percentage measurement is completed and how many seconds until the measurement is completed.
In S530, the visual target 62a is continuously arranged at the same position for a predetermined time T, and the temporal change of the eye refractive power at that time is monitored to calculate the appearance frequency of the high frequency component. The operation of S530 will be described in more detail with reference to FIG.

  By the way, the reason why the appearance frequency of a predetermined high frequency component is adopted as a visual target indicating the state of the eye accommodation function is as follows. In general, the eye slightly moves the ciliary muscle even when the object is looking at an object placed at a certain distance. This fine movement of the ciliary muscle is called “regulatory fine movement”. It has been reported that when the tension of the ciliary muscle of the eye increases, the specific high-frequency component of accommodation fine movement increases, and the frequency of occurrence increases as the tension increases.

Further, the above-described time T (a period during which the eye refractive power temporal change data is sampled) is about 20 seconds or less, which is less burdensome on the ciliary muscle when the eye 60 is staring, T = 3 seconds, It is possible to select from 5 seconds, 10 seconds, and 20 seconds (S400).
Further, in Example 1, in order to examine not only the adjustment function state for each target position α′i (i = 0 to n) but also the transition of the adjustment function state within the time T, the adjustment function The analysis of the state is performed by subdividing the time T into a plurality of sections and using each section as an analysis target. Here, each section is set to be shifted by 1 second within the time T.
In the following, it is assumed that T = 20 seconds is selected, and the time in one section is 8 seconds. In this case, the section of 8 seconds per section is set by shifting by 1 second, so that T = 20 seconds is subdivided into 13 sections. Further, the position of the target 62a is moved to 8 places (8 steps) for measurement.

FIG. 6 is a flowchart showing the operation of monitoring the temporal change in eye refractive power during the predetermined time T and calculating the appearance frequency of high frequency components in S530 of FIG.
In S531, the eye refractive power is measured and the value is acquired.
In S532, it is determined whether or not the time for the first section has elapsed, and the measurement of the eye refractive power is continued until the time for the first section has elapsed (S531, S532). Note that the temporal change data of each eye refractive power acquired here is stored in a memory in association with the target position αi at the time of each acquisition as data used in the next analysis procedure (S533, 534). Is done.
In S533, the appearance frequency of a predetermined high-frequency component is calculated as a target of the adjustment function state from the temporal change data of the eye refractive power acquired during the first section. In addition, since the position where the target 62a is arranged depends on the characteristics (far point position D0) of each eye 60 to be measured, the adjustment function state of each eye 60 should be measured under a unified standard. Can do.

  FIG. 7 is a diagram for explaining the analysis procedure (S533). FIG. 7A is a diagram showing the temporal change data of the eye refractive power acquired at a certain target position α′i. In FIG. 7A, the horizontal axis indicates the elapsed time (seconds) within the predetermined time T, and the vertical axis indicates the eye refractive power (based on the far point position D0) (Dp).

First, the temporal change data of the eye refractive power includes information when the subject eye 60 blinks. Since the signal value output from the refraction measurement unit 61 when the eye 60 is blinking indicates reflected light on the eyelid of the eye 60 to be examined, the data when the eye 60 is blinking is: As indicated by an arrow in FIG. 7A, there may be a case where the value is significantly different from that of other data.
Therefore, the control unit 65 removes data (arrow part) in which the eye refractive power is significantly deviated from the temporal change data (FIG. 7A) of the eye refractive power. Then, the data of that portion is interpolated by the data adjacent thereto. This interpolation is, for example, spline interpolation (third-order spline interpolation). FIG. 7B shows the temporal change data of the eye refractive power after interpolation.

  Thus, if the data at the time of blinking is removed, the adjustment function state of the eye 60 to be examined can be obtained more accurately. Some of the refraction measuring units 61 have a function for automatically removing the data at the time of blinking. Needless to say, if it is added, the removal process by the control unit 65 is unnecessary.

Next, the spectral power of the temporal change data (FIG. 7B) of the eye refractive power after the interpolation is calculated. For this calculation, Fourier transform, for example, FFT (fast Fourier cosine sine transform) is applied.
FIG. 7C is a diagram showing the spectrum power calculated with a certain section in time T as a conversion target. In FIG. 7C, the horizontal axis represents frequency, and the vertical axis represents the logarithm of spectral power. Here, it has been found that the adjustment fine movement described above has a certain high frequency. This frequency is 1 to 2.3 Hz.

  Therefore, the control unit 65 obtains an integral value of spectrum power (area of the hatched portion in the graph of FIG. 7C) in the high frequency component 1 to 2.3 Hz as the appearance frequency of the adjustment fine movement. The calculation frequency of the adjustment fine movement as described above is calculated for each section of each target position α′i (i = 0 to n).

In S534, the astigmatism of the first section is calculated.
In S535, the frequency and astigmatism of the high frequency component in the first section are displayed.
In S536, an argument K = 2 indicating what number section is set.
In S537, it is determined whether or not to stop halfway. This determination is made based on whether or not a record to that effect remains in the midway stop unit 65d by performing an operation such as pressing a specific button by the measurer. When stopping halfway, the process proceeds to S538, and when not stopping halfway, the process proceeds to S539. By making this stop possible, it is possible to prevent unnecessary measurement from being performed when the measurement conditions are not suitable for the eye 60 to be examined.

In S538, the midway stop unit 65d selects whether to restart the measurement as it is or to end the midway. Specifically, it is displayed to the measurer so as to make the selection on the display unit 66, and it is selected whether to resume or end halfway according to the measurer's instruction (operation). If it is selected to resume, the process proceeds to S539. If midway termination is selected, the measurement is terminated as it is.
In S539, the eye refractive power for 1 second is acquired. This step is similar to S531 and S532, but is shown in a simplified manner.
In S540 to S542, the frequency calculation of the high frequency component in the K-th section, the astigmatism calculation, and the display thereof are performed in the same manner as S533 to S535.
In S543, it is determined whether or not the time T has been reached. If the time T has not been reached, the process proceeds to S544, and if the time T has been reached, the process returns to S530.
In S544, K = K + 1 and the number of sections is advanced by one and measurement is continued.

Returning to FIG. 5, in S550, it is determined whether or not the target 62a has moved to (D0 + α′n).
By the way, the manner in which the adjustment fine movement is generated also varies depending on the adjustment effort to see the visual target 62a. Therefore, it is preferable that the adjustment function state is acquired for each of the target positions α′1, α′2,. Therefore, it is preferable that the main measurement procedure of Example 1 includes the following target positions (steps).
As described above, first, the visual target 62a is arranged at a position (D0 + α′0) slightly further from the far point position D0. Then, the target 62a moves closer to the position (D0 + α′0) by one step (for example, 0.5 Dp) (shifts α ′ in the minus direction) (S560) and each target position (α′1 , Α′2,...), The temporal change data of the eye refractive power at the predetermined time T is acquired (S530). This step movement and data acquisition are repeated until the position of the target 62a is a sufficiently close predetermined end position (D0 + α′n) (YES in S550) (α′n = −3Dp as a standard) The end position (D0 + α′n) can be corrected by the position correction unit 65b).
Accordingly, in S550, if the target 62a has not moved to (D0 + α′n), the process proceeds to S560, and if the target 62a has moved to (D0 + α′n), the process proceeds to S580.

In S560, the visual target is moved by one step (0.5 Dp).
In S570, the music reproduction ends, and the process returns to S520. When the process proceeds to these steps, since the measurement in one step is completed, the reproduction is temporarily terminated at that timing. In the first embodiment, the music having the same time as the time T is selected, so that the music ends at this timing. In step S580, the music reproduction ends in the same manner as in step S570. However, if the process proceeds to step S580, the music reproduction ends and the measurement ends.

FIG. 8 is a diagram illustrating an example of displaying the measurement result of the eye accommodation function state in the first embodiment.
FIG. 8A shows a change in the eye accommodation function state of the left eye, FIG. 8B shows a change in the eye accommodation function state of the right eye, and FIG. Changes in (CYL) and astigmatic axis (Ax) are shown. FIG. 8 shows a state in which all the measurements are completed. In the state where the intermediate result is displayed, the results up to the advanced step or section are displayed.
8A and 8B, the appearance frequency of the high frequency component is shown for each target position α′i (i = 0 to n) and for each section. In FIG. 8, the target position represents from +0.5 to −3.0 Dp for each section. The bar graph is color-coded according to appearance frequency (expressed by hatching in FIG. 8), so that the adjustment state of the subject can be seen. For example, if the high frequency component frequency is high, the color is dark, and if the high frequency component frequency is low, the color is dark.
In FIG. 8C, the astigmatism degree is shown on the vertical axis, and the astigmatism axis is displayed in different colors so that these can be visually judged simultaneously.

  According to the first embodiment, the control unit 65 includes an initial position correction unit 65a, an end position correction unit 65b, a measurement time correction unit 65c, an intermediate stop unit 65d, an audio reproduction unit 65e, an astigmatism component change display unit 65f, and an intermediate measurement result. Since the display unit 65g, the data processing unit 65h, the information retrieval unit 65i, and the like are provided, the burden on both the subject and the operator can be reduced, and the eye adjustment function state measurement device can be more easily used.

(Example 2)
FIG. 9 is a configuration diagram of the eye accommodation function state measuring apparatus according to the second embodiment of the present invention.
The second embodiment is an example in which the measurement device main body 151 and the data processing device 200 are combined to form an eye refraction function state measurement device. In addition, the same code | symbol is attached | subjected to the part which fulfill | performs the same function as Example 1 mentioned above, and the overlapping description is abbreviate | omitted suitably.
The measurement apparatus main body 151 includes a storage unit 69, an audio reproduction unit 65e, an astigmatism component change display unit 65f, a measurement intermediate result display unit 65g, a data processing unit 65h, and an information search unit from the eye accommodation function state measurement device 51 of the first embodiment. A portion corresponding to 65i is omitted, and a communication unit 65j is added.

The data processing device 200 includes an audio reproduction unit 265e, an astigmatism component change display unit 265f, a measurement intermediate result display unit 265g, a data processing unit 265h, and an information search unit 265i, and can communicate with the measurement device main body 151 via the communication unit 65j. Device.
The data processing device 200 is a computer and a program that is executed by being installed in the computer. The data processing device 200 includes an audio reproduction unit 265e, an astigmatism component change display unit 265f, an intermediate measurement result display unit 265g, and data processing. It may be formed by a program for causing the unit 265h and the information search unit 265i to function.

As described above, the eye accommodation function state measurement apparatus according to the second embodiment has substantially the same configuration as that of the first embodiment. However, the operation is performed by dividing the measurement apparatus main body 151 and the data processing apparatus 200. There are parts that are different from the case of Example 1. Therefore, the operation of the eye accommodation function state measuring apparatus according to the second embodiment will be described below.
FIG. 10 is a flowchart illustrating a preparation process of the measurement apparatus main body 151 before starting measurement.
In S1010, the measurement start position of the index 62a is set. The measurement start position of the index 62a is basically moved away from the far point position to a position of +0.5 Dp as in the first embodiment, but the position of the far point position D0 + α can be set as the initial position if necessary. In this step, the value of α can be set.
In S1020, the measurement end position of the index 62a is set. The measurement end position of the index 62a is basically the far point position −3.0Dp, but the position of the far point position D0-β can be set as the measurement end position as necessary. You can set the value.
In S1030, a measurement time T for one step is set. As in the first embodiment, the measurement time T can be selected from T = 3 seconds, 5 seconds, 10 seconds, and 20 seconds. The basic time is 10 seconds.
In S1040, a sampling time is set. The sampling time can be selected from 70 ms, 90 ms, and 110 ms. The basic is 110 ms.

FIG. 11 is a flowchart showing the measurement operation of the measurement apparatus main body 151.
In S1100, the far point position D0 is measured.
FIG. 12 is a flowchart showing an operation of measuring the far point position D0 (S1100).
In S1110, the eye refractive power is measured. At this time, the index 62a is optically at a position of +5 Dp, and the index 62a looks blurred.
In S1120, the index 62a is moved to the position of the eye refractive power value. By moving the index 62a, the eye 62 is focused on the index 62a, and the index 62a is clearly visible.
In S1130, the index is moved to the far point (predetermined position D00). This is to remove the accommodation tension.
In S1140, the eye refractive power is recorded a plurality of times.
In S1150, it is determined whether or not the eye refractive power is stable. If the eye refractive power is stable, the process proceeds to S1160. If the eye refractive power is not stable, the process returns to S1120.
In S1160, the eye refractive power when the eye refractive power is stabilized is set to the far point position D0.

Returning to FIG. 11, in S1150, the index 62a is moved to the position of D0 + α.
In S1200, the initial position of the target 62a is corrected as necessary. Here, the correction of the initial position is performed by correcting the far point position D0. When the correction is performed, the index 62a is moved to the corrected position D0 + α.
In S1500, the main measurement of the eye accommodation function state is performed.

FIG. 13 is a flowchart showing the main measurement operation (S1500) of the eye accommodation function state measurement of the measurement apparatus main body 151.
In S1510, the measurement start is transmitted to the data processing device 200.
In S1520, the eye refractive power is measured for a time T specified as the measurement time for one step. During this step, it is possible to stop halfway, resume halfway, and end halfway.
In step S1530, the data is transmitted to the data processing device 200 when one step of measurement is completed.
In S1540, the index 62a is moved by -0.5 Dp.
In S1550, it is determined whether or not the designated number of steps has been completed. If the specified number of steps has been completed, the process proceeds to S1560. If the specified number of steps has not been completed, the process returns to S1520.
In S1560, the end of measurement is transmitted to the data processing device 200.

FIG. 14 is a flowchart showing the main measurement operation of the eye accommodation function state measurement of the data processing device 200.
When receiving the measurement start from the measurement apparatus main body 151, the data processing apparatus 200 initializes a display screen (not shown) in S2010.
In S2020, music playback is performed when music playback is selected.
In step S2030, the process waits for data to be sent from the measurement apparatus main body 151. If data is received, it will progress to S2040.
In S2040, data for one step is received. During data reception, music playback is stopped.

In S2050, data for one section is extracted.
In S2060, noise is cut. For example, removal of noise generated when blinking is performed.
In S2070, cubic spline interpolation is performed. The one-step data sent to the data processing device is data that is unequal in time. If the intervals are unequal, the FFT performed in the subsequent steps cannot be performed. Therefore, cubic spline interpolation is performed to convert the data into data at regular intervals.
In S2080, FFT is performed, and the spectral power of the temporal change data of the eye refractive power is calculated.

In S2090, the integral value of the spectrum power in the high frequency component 1 to 2.3 Hz is obtained as the appearance frequency of the adjustment fine movement.
In S2100, it is determined whether or not the calculation of the number of sections for one step has been completed. If the calculation of the number of sections for one step has been completed, the process proceeds to S2110, and if the calculation of the number of sections for one step has not been completed, the process returns to S2050.
In S2110, the measurement result is displayed in a graph.
In S2120, it is determined whether or not the measurement end is received from the measurement apparatus main body 151. When the measurement end is received from the measuring apparatus main body 151, the operation is ended. When the measurement end is not received, the process returns to S2030.

  As described above, in the second embodiment, the measurement apparatus main body 151 and the data processing apparatus 200 are separately formed. Therefore, the data processing function can be improved by changing only the data processing device 200. Further, if the data processing apparatus 200 is configured by a computer and a program that is installed and executed on the computer, the functions can be improved and the processing speed can be improved more easily.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
For example, in each embodiment, an example in which the measurement time T can be selected from four types has been described. However, the measurement time T is not limited thereto, and for example, the measurement time may be freely set.

51 eye refractive power measuring device 61 measuring unit 61a chopper 61b infrared light source 61c, 61d lens 61e half mirror 61f lens 61g aperture 61h light receiving unit 61i motor 62 projection unit 62a target 62b visible light source 62c convex lens 62d motor 63 dichroic mirror Control unit 65a Initial position correction unit 65b End position correction unit 65c Measurement time correction unit 65d Midway stop unit 65e Audio playback unit 65f Astigmatism component change display unit 65g Measurement result display unit 65h Data processing unit 65i Information search unit 66 Display unit 69 Storage Part

Claims (4)

A target projection unit for projecting a target to the eye to be examined;
A target moving mechanism for moving the position of the target along the optical axis direction of the eye to be examined;
With
In the eye accommodation function state measuring apparatus that arranges the eye targets at a plurality of positions by the eye movement mechanism and measures an eye accommodation function state that is a refractive power change of a high frequency component of the eye to be examined at the plurality of positions.
A data processing unit that additionally stores a data unit including at least a part of a measurement value obtained by measurement of the eye accommodation function state according to a predetermined format as one database;
An information search unit capable of extracting necessary information selected from the database stored by the data processing unit;
Providing
An eye accommodation function state measuring device characterized by the above. The eye accommodation function state measuring device according to claim 1,
The data processing unit is a data unit that is not included in the database stored by the data processing unit, and that reads data including at least a part of information obtained by measuring an eye accommodation function state, and / or Or can be processed,
An eye accommodation function state measuring device characterized by the above. In the eye accommodation function state measuring device according to claim 1 or 2,
The data unit additionally stored by the data processing unit has information on the frequency of occurrence of adjustment fine movement,
The information retrieval unit extracts a high frequency appearance frequency from the database that is equal to or higher than a specific value;
An eye accommodation function state measuring device characterized by the above. In the eye accommodation function state measuring device according to any one of claims 1 to 3,
The data unit additionally stored by the data processing unit has information on astigmatism or refraction value,
The information search unit extracts astigmatism or refraction value from the database with a specific value or more,
An eye accommodation function state measuring device characterized by the above.

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