WO2002096345A1 - Eyestrain eliminator - Google Patents

Abstract

An eyestrain eliminator (1), comprising an image projection part (12) for projecting an image to a trained eye (10), a scanning mechanism (12d, 12e) for scanning the position of the image on the trained eye (10) basis in the direction of optical axis of the trained eye (10), and a control part (15) for controlling the scanning mechanism (12d, 12e), wherein the control part (15) allows the scanning mechanism (12d, 12e) to perform a training scanning for scanning the position of the image, acquires far point information indicating the far point of the trained eye (10) before the training scanning, and sets an image scanning range in the training scanning according to the far point information.

Description

 Description Eye Fatigue Elimination Device This application was filed in Japanese Patent Application No. 2001, No. 1 593 3 94 (filed on May 28, 2001) and Japanese Patent Application No. 2000 Based on No. 2.86693 (filed on September 20, 2001), their contents are incorporated herein by reference. Technical field

 The present invention relates to an eye fatigue eliminating device that presents an image to a trainee's eye and scans the position of the image to encourage training of the ciliary muscle of the trainee's eye. Background art

 In the current information society, eyes are overworked due to the recent work on the screen of televisions and personal computers.

 In normal work, the eye adjusts appropriately to see different objects at different distances, and repeatedly relaxes and tensions ciliary muscles. However, during overwork, the eye stops adjusting to keep the object at the same distance, and the ciliary muscle remains tense. If the tension continues, the ciliary muscles become fatigued and their movements become dull, resulting in improper adjustment. As a result, the object becomes less visible and causes various stresses. It is also said that long-term repetition of this fatigue can lead to poor vision.

 The apparatus described in Japanese Patent Application Laid-Open No. Hei 6-339501 can relax (relax) the tension of the ciliary muscles of the eye through training, thereby eliminating fatigue. The configuration of this device is as simple as moving the target from near to far (scanning) the trainee's eye, but if the trainee tries to see the target clearly, The eye follows this scan and attempts to change the ciliary muscle from tension to relaxation. In other words, scanning the position of the optotype stimulates ciliary muscle training.

However, in general, the range in which the eye can see the optotype differs for each individual eye. Therefore, if the scan range of the target is too close or too far for the eye to be trained, the above-described tracking becomes difficult, and the training may not be performed properly.

 On the other hand, it is conceivable to set the scan range of the target in advance so that training can be performed properly for any trained eye, but this is necessary for many trained eyes. The above-mentioned time is spent, so the efficiency is low.

 In addition, in order to effectively perform the above-described training, it is preferable that the trainee be relaxed. If the trainee is nervous, the ciliary muscle of the trainee's eye will not be loosened easily. However, since the device described in Japanese Patent Application Laid-Open No. Hei 6-339501 is not particularly constructed from such a viewpoint, the trainee is required to place the device in a predetermined place where the device is installed. And the head must be fixed to the measuring window.

 For this reason, in the past, it was difficult for the trainee to relax, and as a result, there was a possibility that the training did not last for a long time, or the effect of the training could not be obtained much. Disclosure of the invention

 The present invention provides an eye fatigue relieving device capable of appropriately and efficiently training the ciliary muscle of each eye to be trained. Another aspect of the present invention provides an eye fatigue eliminating device capable of maintaining a good condition in which a trainee can easily relax in order to efficiently train ciliary muscles of the trainee's eye.

 An eye fatigue eliminating apparatus according to the present invention includes: an image projection unit that projects an image on a trained eye; a scanning mechanism that scans a position of an image based on the trained eye in an optical axis direction of the trained eye; A control unit for controlling the mechanism, wherein the control unit causes the scanning mechanism to perform a training scan for scanning the position of the image, and precedes the training scan with far point information indicating a far point of the eye to be trained. Acquire and set the scan range of the image in the training scan according to the far-point information.

 In this eye fatigue eliminating device, it is preferable that the scanning range is set near a position corresponding to a far point when viewed from the trained eye.

 In this case, it is preferable that the scanning range be set to a range from a position closer to the far point as viewed from the trainee's eye to a position farther than the position corresponding to the far point.

In addition, the apparatus further includes a refraction change detecting unit that detects a change in the refracting power of the trained eye. The control unit reduces the position of the image in the optical axis direction of the trained eye with respect to the scanning mechanism when acquiring the far-point information. It is preferable that the scanning is performed once, and the far point information is obtained based on the change detected by the refraction change detecting unit during the scanning. Further, the control unit causes the scanning mechanism to perform a plurality of scans during the training scan, obtains far-point information based on the change detected by the refraction change detection unit during the scan, and performs the training scan. If the far-point information acquired during the process changes, it is preferable to update the scanning range of the image in accordance with the change. Alternatively, the control unit further includes a display for displaying information externally in response to an instruction from the control unit, wherein the control unit acquires far-point information after the end of the training scan, and acquires the acquired far-point information and the training. It is preferable to determine the difference from the far-point information acquired prior to the scan, and instruct the display to display the difference as an effect of the training scan to the outside.

 In addition, the control unit further includes an interface unit for inputting clear vision information indicating whether or not an image can be clearly seen from a trainee having the trained eye. The scanning mechanism scans the position of the image at least once in the optical axis direction of the trainee's eye, and calculates far-point information based on clear vision information input from the trainee via the interface during scanning. It is preferable to obtain it. The control unit further includes a display for displaying information externally in response to an instruction from the control unit, wherein the control unit acquires far-point information after the end of the training scan, and acquires the acquired far-point information and It is preferable to obtain the difference from the previously acquired far-point information and instruct the display to display the difference as an effect of the training run to the outside.

 The control unit further includes an interface unit for inputting visual acuity information indicating the visual acuity of the trained eye from outside, and the control unit acquires far point information based on the visual acuity information externally input via the interface unit. Is preferred.

 Another apparatus for eliminating eye fatigue according to the present invention includes: an image projecting unit that projects an image to a trained eye; a fixing unit that fixes the image projecting unit to a trainee having the trained eye; A scanning mechanism that scans the position of the image with respect to the image in the optical axis direction of the eye to be trained, and a control unit that causes the scanning mechanism to perform a training scan that scans the position of the image a plurality of times.

In this eye fatigue eliminating device, it is preferable that the image projecting unit comprises a two-dimensional image display for displaying a general image input from the outside. In this case, during the training scan, the control unit preferably sets the image to be displayed by the image projection unit to a predetermined training image instead of the general image. The control unit further includes an interface unit for externally selecting one of the plurality of types of training images, and the control unit determines a training image to be displayed by the image projection unit during the training scan. Preferably, it is set to the one selected via the interface unit.

 Further, it is preferable that the control unit causes the scanning mechanism to perform the training scan at a predetermined timing during the display of the general image or after the display is completed.

 Preferably, the apparatus further includes a sound output unit that emits a sound, and the control unit outputs a predetermined training sound to the sound output unit during the training scan.

 Further, it is preferable that the control unit obtains far-point information indicating the far point of the eye to be trained prior to the training scan, and sets the scanning range of the image in the training scan according to the far-point information. Mas ^

 It is preferable that the above-mentioned eye fatigue eliminating device further includes a fatigue degree measuring unit for measuring the degree of fatigue of the training eyes. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an external view of an eye fatigue eliminating device 1 according to the first embodiment.

 FIG. 2 is a configuration diagram of the eye fatigue eliminating device 1 of the first embodiment.

 FIG. 3 is an operation flowchart executed by the control unit 15 of the first embodiment. Fig. 4 (a) shows the change in the position of the target 12a in the pre-measurement procedure, Fig. 4 (b) shows the change in the eye refractive power in the pre-measurement procedure, and Fig. 4 (c) FIG. 4D is a diagram showing a change in the position of the target 12a in the training scanning procedure, and FIG. 4D is a diagram showing a change in the eye refractive power in the training scanning procedure.

 FIG. 5 is an external view of the eye fatigue eliminating device 2 of the second embodiment.

 FIG. 6 is a configuration diagram of the eye fatigue eliminating device 2 of the second embodiment.

 FIG. 7 is an operation flowchart executed by the control unit 25 of the second embodiment. FIG. 8 is an external view of the eye fatigue eliminating device 3 of the third embodiment.

 FIG. 9 is a configuration diagram of the eye fatigue eliminating device 3 of the third embodiment.

FIG. 10 is an operation flowchart executed by the control unit 35 of the third embodiment. _C FIG. 11 is a diagram showing a conversion table stored in the control unit 35 of the third embodiment.

 FIG. 12 is a diagram showing the configuration and appearance of the eye fatigue eliminating device 4 of the fourth embodiment.

FIG. 13 is an operation flowchart executed by the control unit 45 of the fourth embodiment. <FIG. 14 is a diagram illustrating a training image. FIG. 15 is a diagram for explaining a change in the training image.

 FIG. 16 is a diagram showing the configuration and appearance of an HMD 5 with an eye fatigue eliminating device according to a fifth embodiment. FIG. 17 is an operation flowchart executed by the control unit 55 of the fifth embodiment. '

 FIG. 18 is an operation flowchart of the control unit when measuring the degree of eye fatigue.

 FIG. 19 is a diagram for explaining the analysis procedure (step S65).

 Figure 20 shows the frequency of the appearance of fatigue tremor in the training eyes 10 that are not tired.

(i = 0 to n), and for each section.

 FIG. 21 is a diagram showing the appearance frequency of fatigue tremor of the training eye 10 who is tired for each of the target positions i (i = 0 to n) and for each section. BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>

 A first embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. FIG. 1 is an external view of an eye fatigue eliminating device 1 of the present embodiment, and FIG. 2 is a configuration diagram of the eye fatigue eliminating device 1. As shown in Fig. 1, the cover 1a of the eye fatigue relieving device 1 has a measurement window 1b through which measurement light (described later) is incident on the eye to be trained, a display device 16 for displaying information, A start button 17 and the like are arranged.

 The trainee can train the ciliary muscles of the eye through the inside of the measurement window 1b while supporting the entire eye fatigue eliminating device 1 like a video camera. . As shown in FIG. 2, the eye fatigue eliminating device 1 includes a refraction measuring unit 11 (corresponding to a refraction change detecting unit), a projecting unit 12 (corresponding to an image projecting unit), a dichroic mirror 13, and a control unit. A section 15 (corresponding to the control section), a display 16 (corresponding to the display), a start button 17 and the like are provided.

The projection unit 12 includes an optotype 12a, a light source (visible light source) 12b, a convex lens 12c, an optotype moving mechanism 12d, and a motor 12e. In the projection unit 12, a convex lens 12c, a target 12a, and a light source 12b are arranged in order from the side (closer) to the trained eye 10. The luminous flux from the optotype 12a illuminated by the light source 12b is applied to the convex lens 12c. After being converted to a state close to a parallel light beam, it enters the trained eye 10, so when viewed from the trained eye 10, the position of the optotype 1 2a appears to be farther than the actual position . Of these, the optotype 12a and the light source 12b are trained by the optotype moving mechanism 12d and the motor 12e (corresponding to the scanning mechanism) in a state in which the positional relationship is not changed. It is movable in the optical axis direction of the eye 10. The refraction measuring unit 11 is, for example, a refracting power measuring device to which a radiographic method is applied, such as a refracting power measuring device described in Japanese Patent Application Laid-Open No. Hei 6-135577.

 The refraction measuring unit 11 has a slit 11a with a slit, a motor 11i for rotating the 11a, and a light source (infrared light source) 11b for illuminating the 11a. A lens 1 1d for projecting a stripe pattern formed by the upper lid 11a onto the fundus of the trained eye 10; a light receiving unit for detecting a moving speed of the stripe pattern formed by light returning from the fundus of the trained eye 10 1 lh, optical system 11 f, 11 g, etc. are provided (note that 11 f and 11 c indicate a lens, 11 e indicates a half mirror, and 11 g indicates an aperture.) .

 The dichroic mirror 13 converts the measurement light (infrared light) emitted from the refraction measurement unit 11 and the measurement light (visible light) emitted from the projection unit 12 into the trained eye 10. Also, the infrared light returning from the trained eye 10 functions to return to the refraction measuring unit 11. Here, in the refraction measuring unit 11, the chopper 11a rotates, so that the stripe pattern projected on the fundus of the trained eye 10 moves. Then, the moving speed of the striped pattern formed on the light receiving section 1 lh changes according to the refractive power of the trained eye 10. Therefore, a change in the signal detected by the light receiving unit 11 h indicates a change in the refractive power of the trained eye 10.

Note that the refraction measuring unit 11 of the present embodiment only needs to be able to measure at least one change in the refractive power in the radial direction among the refractive powers of the eye 10 to be trained. The moving direction may be at least one direction, and the moving speed detected by the light receiving unit 11h may be a moving speed in at least one direction corresponding to the moving direction. The control unit 15 includes a CPU and a circuit including a memory used for the operation thereof. The control unit 15 refers to a signal output from the start button 17 and the light receiving unit 11 h to generate a light source 12 b , 11b, motors 12e, 11i, and display 16 for drive control and calculations. Specifically, the control unit 15 controls the driving of the motor 12e while controlling the light source 12b, thereby arranging the targets 12a (the targets 12a and the light sources 12b), and Scan position I do.

 Further, the control unit 15 detects the change in the refractive power of the trained eye 10 by referring to the output of the light receiving unit 11h while driving the light source 11b, the motor 11 and the light receiving unit 11h. (Note that this change in refractive power can be detected at relatively short intervals of about 0.2 seconds.)

 FIG. 3 is an operation flowchart executed by the control unit 15. When the control unit 15 recognizes that the start button 17 has been pressed (step SI YES), the pre-measurement procedure (steps S2 to S5), the training scan procedure (steps S6 to S11), and the result display procedure (step S6 to S11) Steps S12 and S13) are performed in order. In the pre-measurement procedure, first, the target 12a is arranged at a predetermined position D00 (step S2).

 This predetermined position D00 is a position sufficiently close to the trained eye 10 as a reference, for example, a position corresponding to a remote position 30 cm from the trained eye 10 (note that the remote position is Expressed by the refractive power necessary to image the object placed there, it is about 3.33 D P (diopter), which is hereinafter referred to as the “eye refractive power.” The position based on 10 is represented by the eye refractive power in this way.

 Next, the position of the target 12a is gradually scanned far (Step S3), and a change in the eye refractive power of the trained eye 10 at that time is monitored (Step S4). The timing of this monitoring may be intermittent or continuous. Here, FIG. 4 (a) is a diagram showing a change in the position of the target 12a in the pre-measurement procedure, and FIG. 4 (b) is a diagram showing a change in the eye refractive power in the pre-measurement procedure. It is.

 When the trained eye 10 can clearly see the target 12a (ie, the trained eye 10 is making adjustments), the eye refractive power follows the scanning of the position of the target 12a. However, when the trained eye 10 cannot clearly see the target 12a (that is, the trained eye 10 does not adjust), the eye refractive power does not follow the scanning of the position of the target 12a. The position at which the eye refractive power starts to be unable to follow is the “far point”, that is, the farthest position where the trained eye 10 can clearly see.

Hereinafter, in this specification, the actual arrangement position of the target 12a that appears to be arranged at a distant point when viewed from the trained eye 10 is referred to as a “distant point position”. The control unit 15 continues to move the target 12a until there is no change in the eye refractive power (steps S3 and S4), and the change has disappeared. The position of the optotype 12a at the time point (step S4N0) is regarded as the far point position DO of the trained eye 10, and this far point position DO is stored in the memory (step S5).

 In the subsequent training scanning procedure, first, the target 12a is arranged at a position (DO-α) slightly closer to the far point DO (step S6). The reason why the trainee is placed at a position slightly closer to the far point DO as described above is to ensure that the trainee once clearly sees the target 12a at the beginning of the training measurement procedure. . Here, α is approximately 0.5Dp to 1Dp, taking into account the measurement error of the far-point position DO in the previous measurement procedure.

 Next, the target 12a is scanned gradually from this position (DO-hi) (step S7). FIG. 4 (c) is a diagram showing a change in the position of the target 12a in the training scanning procedure, and FIG. 4 (d) is a diagram showing a change in the eye refractive power in the training scanning procedure. The scanning speed at this time is preferably slower than the scanning speed in step S3. Because the scanning of the position of the target 12 a in the pre-measurement procedure is for measuring the far point of the eye 10 to be trained, the scanning of the position of the target 12 a in the training scanning procedure is This is because it relaxes the ciliary muscle of the trained eye 10. The control unit 15 continues moving the target 12a until there is no change in the eye refractive power (steps S7 and S8), and determines the position of the target 12a at the time when the change has disappeared (step S8 NO). The new far-point position DO of the trained eye 10 is regarded as the new far-point position DO, and the new far-point position DO is stored in the memory (step S9).

 The movement of the optotype 12a in step S7 is farther than the latest far point position DO (or the immediately preceding far point position DO), that is, the position at which the eye refractive power does not completely follow ( D0 + i6), which is equivalent to 2Dp to 3Dp. Thus, by slowly scanning the position of the target 12a, even if the ciliary muscle of the trained eye 10 is tensed, the trainee is trained to relax. As a result, the distant point DO of the trained eye 10 may move farther than the previous value.

Further, the scanning in steps S6 to S9 is repeated until the number of scans reaches a predetermined number (for example, 5) (step S10YES). Here, in the present embodiment, the arrangement position (DO-α) of the optotype 12a in step S6 is updated each time the far point position D0 changes to a distant position. That is, the far point position DO is fed back to the arrangement position (DO-a) (step S6) of the optotype 12a in the subsequent scanning. When the scanning (steps S6 to S9) is repeated a predetermined number of times (step S10YES), it is determined whether there is a difference between the latest far-point position DO and the immediately preceding far-point position DO. It is determined (step S11), and if there is a difference (step S11YES), it is considered that the effect of scanning is still expected, and the process returns to step S6. If there is no difference, it is considered that the effect of further scanning cannot be expected, and the result display procedure in steps S12 and S13 is executed.

 In the result display procedure, the difference between the far point position D01 (far point position at the start) obtained in the previous measurement procedure and the latest far point position D02 (far point position at the end) obtained in the training scanning procedure is calculated. Is obtained as information indicating the effect of the training scanning procedure (step S12), and this is displayed on the display 16 (step S13). For example, the far point position D01 at the start is a position corresponding to lDp (remote position of lm as viewed from the trained eye 10), and the far point position DO 2 at the end is a position corresponding to 0.25Dp (the trainee's eye 10). At a distance of 4 m from the viewpoint), a message such as “Training effect ΔD p = 0.75” is displayed.

 As described above, according to the present embodiment, the far point position DO of the eye 10 to be trained is measured in the pre-measurement procedure (steps S2 to S5), and the far point position DO is measured in the training scan procedure (steps S6 to S11). The target 12a is scanned in a range ((DO—cO to (D0 + / 3)) corresponding to the point position DO. This range ((DO— to (D0 + J3)) is By moving the target 12a gradually from near to far within the range ((DO-α) to (DO +)), the hair of the trained eye 10 Training to transition the muscle from a less tensioned state to a state of sufficient relaxation is realized.

 By the way, the range for performing such training varies depending on the individual trained eyes. In the present embodiment, each time the trained eye 10 changes, the far point position DO is measured by the pre-measurement procedure. The ranges ((DO-a) to (D0 +) 3)) flexibly correspond to the characteristics of each trained eye. Therefore, the eye fatigue eliminating device 1 of the present embodiment can appropriately and efficiently train the trained eye 10.

 Moreover, in the present embodiment, the far point position DO is actually measured based on a change in the eye refractive power of the trained eye 10, so that it is possible to flexibly cope with an environmental change of the trained eye 10. Further, in the present embodiment, even during the training scanning procedure, the range is changed every time the far-point position DO changes.

Since ((DO-α) to (D0 + / 3)) is updated, the lessons learned during the training scan procedure It can flexibly cope with changes in the subject.

 Further, in the present embodiment, the change in the far point position before and after the training scanning procedure is displayed as the training effect. Therefore, the trainee can confirm the displayed content to obtain a feeling of accomplishment of the training or to display the displayed content. You can also keep your eyes healthy by referring to the contents.

 In the present embodiment described above, the arrangement position (DO-H) of the optotype 12a is updated each time the distant point position DO changes to a distant position, but the operation by the control unit 15 is simplified. If necessary, the operation related to this update may be omitted. Further, in the present embodiment, the scanning is repeated as long as the far point position D0 changes even after the number of scans reaches the predetermined number, but if the operation by the control unit 15 needs to be simplified, However, the operation for repeating this may be omitted.

 Further, the refraction measuring unit 11 of the eye fatigue eliminating device 1 of the present embodiment has two directions perpendicular to each other, as in a refractive power measuring device described in Japanese Patent Application Laid-Open No. 6-135757. You may comprise so that an eye bending power may be detected. In this way, it becomes possible to measure the refractive power and the astigmatic power.

<Second embodiment>

 A second embodiment of the present invention will be described based on FIGS. 5, 6, and 7. FIG. Here, only differences from the first embodiment will be described, and other description will be omitted.

 FIG. 5 is an external view of the eye fatigue eliminating device 2 of the present embodiment, and FIG. 6 is a configuration diagram of the eye fatigue eliminating device 2. As shown in Fig. 5, the measurement window lb, the display unit 16, the start button 17 and the far-point input switch 27 (corresponding to the interface means) are arranged on the cover 2a of the eye fatigue eliminating device 2. Have been.

 As shown in FIG. 6, the eye fatigue eliminating device 2 is different from the eye fatigue eliminating device 1 shown in FIG. 2 in that a far point input switch 27 is provided in place of the refraction measuring section 11 and a dichroic mirror 13 is provided. This is omitted, and is equivalent to that provided with a control unit 25 instead of the control unit 15. The far point input switch 27 is a button for inputting to the eye fatigue eliminating device 2 whether or not the trainee can clearly see the optotype 12a.

Like the control unit 15, the control unit 25 includes a CPU and a circuit including a memory used for the operation thereof, and refers to signals output from the start button 17 and the far-point input switch 27. To control and drive the light source 12b, motor 12e, and display 16 To FIG. 7 is an operation flowchart executed by the control unit 25. In FIG. 7, the same steps as those shown in FIG. 3 are denoted by the same reference numerals.

 When the control unit 25 recognizes that the start button 17 has been pressed (step SI YES), the pre-measurement procedure (steps S2, S3, S24, S5), the training scan procedure (steps S6, S7, Perform steps S28, S10), post-measurement procedure (steps S2, S3, S24, S5), and result display procedure (steps S12, S13). The pre-measurement procedure of the present embodiment measures the far point position DO of the eye 10 to be trained, similarly to the pre-measurement procedure of the first embodiment. Instead of monitoring the eye refractive power of the eye 10 (see step S4 in FIG. 3), the state of the far point input switch 27 is monitored (step S24).

 After the trainee presses the start button 17, the trainee looks at the opposing target 12a, and presses the far-point input switch 27 when it becomes impossible to see clearly. The control unit 25 regards the position of the optotype 12a at the time when the far point input switch 27 is pressed (step S24 YES) as the far point position DO of the trained eye 10, and stores the far point position DO in the memory. (Step S5). Also, the training scan procedure (steps S6, S7, S28, S10) of the present embodiment covers the target 12a in the range ((DO−) to ((DO−)), similarly to the training scan procedure of the first embodiment. D0 + β)), the scanning is gradually repeated far (at a slow speed) a predetermined number of times, and even if the distant position DO of the trained eye 10 changes during the scanning, it is detected. The range ((DO- a) to (DO +)) is always fixed, because we don't know.

 The post-measurement procedure (steps S2, S3, S24, S25) of the present embodiment measures the far-point position DO after the execution of the training scanning procedure. This is performed in the same manner as the pre-measurement procedure of the present embodiment. In the result display procedure (Steps S12 and S13), the difference between the measured far-point position DO and the far-point position D0 measured in the previous measurement procedure is used as a training effect.

This is displayed on the display 16.

As described above, in the present embodiment, the range of each scan in the training scan procedure ((DO−a) to (DO + β)) remains fixed, so that the training efficiency is slightly lower than in the first embodiment. Although there is a possibility, the far point position DO is measured by the pre-measurement procedure every time the trained eye 10 changes, so that substantially the same effects as in the first embodiment can be obtained. And in this embodiment, By using the far-point input switch 27, the refraction measuring unit 11 (see FIG. 2) can be omitted, so that the configuration of the apparatus for eliminating eye fatigue 2 is simplified.

 That is, according to the present embodiment, the eye 10 to be trained can be appropriately and efficiently trained by the eye fatigue eliminating device 2 having a simple configuration.

<Third embodiment>

 A third embodiment of the present invention will be described based on FIGS. 8, 9, 10, and 11. FIG. Here, only differences from the second embodiment will be described, and other description will be omitted. FIG. 8 is an external view of the eye fatigue eliminating device 3 of the present embodiment, and FIG. 9 is a configuration diagram of the eye fatigue eliminating device 3. As shown in FIG. 8, a measurement window lb, a display 16, a start button 17, a visual acuity input switch 37, and the like are arranged on a cover 3a of the eye fatigue eliminating device 3. Here, the visual acuity input switch 37 is a switch for the operator to input the visual acuity value of the trained eye to the eye fatigue elimination device 3. For example, ten types of visual acuity values (0.9 or more, 0.6 ~ 0.8, 0.3 to 0.5, 0.2, 0.1, 0.08, 0.06, 0.04, 0.02, 0.02 or less) Consists of 10 selection switches for As shown in FIG. 9, the eye fatigue eliminating device 3 is different from the eye fatigue eliminating device 2 shown in FIG. 6 in that a visual acuity input switch 37 is provided instead of the far point input switch 27 and a control is performed instead of the control unit 25. Equivalent to that provided with part 35. Like the control unit 25, the control unit 35 includes a CPU, a circuit including a memory used for the operation thereof, and the like, and refers to the signals output from the start button 17, the sight input switch 37, the light source 12b, It drives and controls the motor 12 e and the display 16.

 FIG. 10 is an operation flowchart executed by the control unit 35. In FIG. 10, the same steps as those shown in FIG. 7 are denoted by the same reference numerals. When the control unit 35 recognizes that the start button 17 has been pressed (step S1YES), the visual acuity input procedure (steps S32, S33, S5), the training scan procedure (steps S6, S7, S28) , S 10) in order.

The visual acuity input procedure of the present embodiment is for acquiring the far point position DO of the eye 10 to be trained, as in the pre-measurement procedure of the second embodiment. First, the user inputs the visual acuity of the trained eye 10 (step S32), converts the input visual acuity into the far-point position DO (step S33), and stores the converted far-point position DO in the memory. Remember (step S5).

 In addition, the control unit 35 in step S32 displays, for example, character information such as "Please input visual acuity" on the display unit 16. This prompts the operator to input visual acuity. The operator inputs the eyesight of the trained eye 10 measured in advance to the eye fatigue eliminating device 3 via the eyesight input switch 37. The control unit 35 stores a conversion table as shown in FIG. 11 in a memory in advance. The control unit 35 in step S33 can convert the visual acuity of the trained eye 10 into the far point position DO of the trained eye 10 by referring to the conversion table.

 The relationship between the visual acuity value and the far point is well-known (it is not an absolute relationship, but an overview is known statistically). The relationship between the far point and the far point position (the actual placement position of the optotype 12a that appears to be located at the far point when viewed from the trainee's eye 10) is expressed by the convex lens 12c and It is determined by the distance between the convex lens 1 2 c and the trained eye 10. Therefore, this conversion table can be created in advance according to the well-known relationship, the characteristics of the convex lens 12c, and the arrangement interval from the convex lens 12c to the eye 10 to be trained.

 Incidentally, the numerical values shown in parentheses in Fig. 11 represent the far points corresponding to the respective visual acuity values by D p (diopter). The known one was adopted.) By the way, the training scan procedure (steps S6, S7, S28, S10) of the present embodiment covers the target 12a in the range ((DO-a ) ~ (DO

 + β)) It repeats scanning a distant place (at a slow speed) a predetermined number of times.

 Note that the eye fatigue eliminating device 3 of the present embodiment is not provided with a means for actually measuring the far point position D O, and thus the result display procedure described in the second embodiment is not executed. As described above, in the present embodiment, instead of the far point position DO not being actually measured, the eyesight of the trained eye 10 (the eyesight of the left and right eyes of each person is generally memorized by each person) instead of being measured. Since the input is made, it is not possible to cope with the environmental change of the trained eye 10, but appropriate and efficient training according to the visual acuity of the trained eye 10 is performed.

Then, in the present embodiment, the training can be shortened by the amount of no measurement. In this way, the eye fatigue relieving device 3 that can perform training in a short time is used in schools and the like. This is suitable when it is necessary to train a large number of trained eyes 10. In the present embodiment, the man-machine interface for inputting visual acuity is a visual acuity input switch 37, but if a visual acuity can be input, for example, a numerical value indicating the visual acuity may be used. Other man-machine interfaces, such as a numeric keypad for direct input and a GUI for inputting visual acuity while viewing on the display 16, may be employed. <Supplement to the first, second, and third embodiments>

 In the first embodiment or the second embodiment, the effect of the training scan is displayed on the display device 16. However, the operation related to this display by the control unit may be omitted. That is, in the operation flowchart shown in FIG. 3, the result display procedure may be omitted. In the operation flowchart shown in FIG. 7, the post-measurement procedure and the result display procedure may be omitted. In this case, the display 16 may be omitted.

 Further, any one of the eye fatigue eliminating devices of the above embodiments may be provided in a head mount display (HMD) (for example, one described in Japanese Patent Application Laid-Open No. 07-335355). May be on board. When mounted on an HMD, the display image displayed by the HMD may be used instead of the optotype. That is, the apparent position of the display image may be scanned in the optical axis direction of the eye.

 Since the displayed image by the HMD is an image with high significance for the user, it is easily noticed by the user, the eye refractive power is more reliably followed, and the effect of the training of the ciliary muscle is enhanced. In this case, the control unit may be configured so that the training is automatically performed. According to such a configuration, eye fatigue can be eliminated without the user's intent just by using the HMD.

 Further, in the eye fatigue eliminating device 3 of the third embodiment, the input of the far point information (the visual acuity value of the eye to be trained) is performed by the trainee, but is provided outside by providing a communication control circuit. The far-point information may be transmitted by data communication from the eye information measuring device. The eye information measuring device includes a refractive power measuring device (generally called an autoreflective device, which is known in Japanese Patent Application Laid-Open No. 6-165757, etc., and has the same principle as the refraction measuring unit 11 (FIG. 2)) and eyeglasses. Frequency measuring device (generally called a lens meter, which is known in Japanese Patent Application Laid-Open No. 11-304654).

<Fourth embodiment> A fourth embodiment of the present invention will be described based on FIGS. 12, 13, 14 and 15. FIG.

 FIG. 12 is a diagram showing the configuration and appearance of the eye fatigue eliminating device 4 of the present embodiment. The eye fatigue eliminating device 4 of the present embodiment is obtained by combining the eye fatigue eliminating device 2 of the second embodiment with a head mount display (HMD). Here, only the differences from the second embodiment will be described, and other description will be omitted. Hereinafter, this eye fatigue eliminating device 4 is referred to as “HMD with eye fatigue eliminating device”.

 As shown in Fig. 12, the HMD 4 with an eye fatigue eliminating device has a head fixing part 4a (corresponding to the fixing means). Is the observer of the HMD. The head fixing portion 4a is, for example, a helmet that supports each component in the HMD 4 with an eye fatigue eliminating device and that can be worn on the user's head.

 An elastic member (not shown) such as rubber is formed at a portion of the head fixing portion 4a that comes into contact with the user's head, and vibration applied from the outside is absorbed. The head fixing portion 4a used in the HMD 4 with the device for eliminating eye fatigue is not limited to a helmet, but may be a strap or the like as long as the device for fixing the eye fatigue 4 can be fixed to the user's head. Other types may be used. Regarding the type of the head fixing part 4a, similar to the head fixing part in a general HMD, depending on the weight of each element such as an optical system and a circuit employed therein and the layout of each element, etc. Preferably, an appropriate one is selected.

 Such an HMD 4 with an eye fatigue eliminating device does not require an installation place. In addition, the user can sit, move, and freely move his / her body while using the HMD 4 with the device for eliminating eye fatigue. Therefore, the user can perform training of the eyes 40 (described later) in a relaxed state. In addition, the HMD 4 with an eye fatigue eliminating device is provided with an external video output device 41 such as a DVD player or a CD player, similarly to a general HMD. The video output device 41 outputs image data of a general image such as a movie.

The HMD 4 with an eye fatigue eliminating device has a control unit 45, a projecting unit 42, a start button 47, a far point input switch 57, and the like, similarly to the eye fatigue eliminating device 2 of the second embodiment. However, the projection unit 42 is provided with a display 42 a instead of the optotype 12 a and the light source 12 b. The display 42a is a small liquid crystal display similar to that mounted on a general HMD.

This is a display that can display various images (still images and moving images) in response to external instructions. The general image output from the video output device 41 is displayed on the display device 42a. Incidentally, the reason why the light source 12b is unnecessary in the projection unit 42 of the present embodiment is that the light source is built in the display 42a.

 In the projection section 42, a convex lens 42c and a display 42a are arranged in order from the side (closer) to the user's eye 40. The luminous flux from the display 42 a is converted into a state close to a parallel luminous flux by the convex lens 42 c and then enters the user's eye 40, so that when viewed from the eye 40, the light from the display 42 a The position appears to be farther than the actual position.

 In FIG. 12, reference numeral 43 denotes a mirror arranged to guide the light emitted from the convex lens 42 c toward the eye 40. Here, the display 42 a of the present embodiment can be moved in the optical axis direction by a display moving mechanism 42 d and a motor 42 e (corresponding to a scanning mechanism). The display moving mechanism 42d is used for diopter adjustment (positioning the display 42a at the far point of each user's eye 40) and for training scans to eliminate eye fatigue. Is also used (details are described later).

 In the present embodiment, not only the above-described general image but also a training image is added to the image displayed on the display 42a (details will be described later). The image data of the training image is stored in the memory of the control unit 45 in advance, and the display is performed according to an instruction from the control unit 45. Also, in the present embodiment, it is assumed that a plurality of types of training images are prepared, and the user can select one of them (the details will be described later). For this purpose, the HMD 4 with an eye fatigue eliminating device is provided with an image selection button 48 (corresponding to an interface means).

Since the video output device 41 outputs not only the image data of the general image but also the accompanying audio data, the HMD 4 with the eye fatigue eliminating device has a speaker 49 (corresponding to the audio output unit). ) Is preferably provided (hereinafter, the case where it is provided will be described). The control unit 45 in the HMD 4 with the eye fatigue eliminating device having the above configuration includes a CPU, a circuit including a memory used for the operation thereof, and the like, a start button 47, a far point input switch 57, and By referring to the signal output from the image selection button 48, the motor 42e is driven and controlled, or the calculation is performed. The control unit 45 displays a general image on the display 42 a or emits sound from the speaker 49 based on the image data and audio data output from the video output unit 41.

 Since the HMD 4 with eye fatigue eliminating device is fixed to the user's head when used, some or all of the above buttons (start button 47, far point input switch 57, image selection button 48) May be configured as a remote controller so that the user can operate it at hand. FIG. 13 is an operation flowchart which is executed by the control unit 45 of the present embodiment. In FIG. 13, the same steps as those shown in FIG. 7 are denoted by the same reference numerals. .

 When the control unit 45 recognizes that the start button 47 has been pressed (step SI YES), the pre-measurement procedure (steps S2 ', S3', S24, S5 '), the training image determination procedure (step S2'). Steps S41, S42, S43), the general image display procedure (steps S44, S45), and the training scanning procedure (steps S6 ', S7', S8 ', S10) are sequentially executed.

 Here, the general image display procedure is to display a general image (movie or the like) from the video output device 41 on the display device 42a. The training scan procedure (steps S 6 ′, S 7 ′, S 8 ′, and S 10) is similar to the training scan procedure of the second embodiment where the position of the target 12 a is scanned. This scans the position of 42a.

 Further, the pre-measurement procedure (steps S 2 ′, S 3 ′, S 24, S 5 ′) of the present embodiment is performed in the same manner as when the position of the target 12 a is scanned in the pre-measurement procedure of the second embodiment. The position of the display 42a is scanned, and the far point position DO of the eye 40 is measured and stored. In addition, in step S5 'of the pre-measurement procedure, diopter adjustment for arranging the display 42a at the measured far-point position DO is also performed (that is, the pre-measurement procedure of the present embodiment has a role of diopter adjustment). Also fulfills).

 First, in the present embodiment, the training scan procedure is executed immediately after the general image display procedure, so that immediately after the user finishes watching a movie or the like, the eye 40 is automatically trained. Since the user's eyes 40 become tired when watching a movie or the like, the training performed at this timing is effective. Another advantage is that the training that takes place immediately after watching a movie or the like can be performed with little awareness by the user.

Also, in the present embodiment, the pre-measurement procedure is executed first. This is so that the training scan procedure can be started immediately after the end of the image display procedure. In addition, since the HMD 4 with the device for eliminating eye fatigue is provided with the speed force 49, the control unit 45 may flow an audio guide from the speaker 49 in the pre-measurement procedure.

 For example, immediately after executing step S 2 ′, it is preferable to play audio guides “Pay attention to the image” and “Press the far point input switch 57 when the image disappears”. It is assumed that the voice data of these voice guides is stored in the memory of the control unit 45 in advance.

 Also, in the pre-measurement procedure of the present embodiment, the image displayed on the display 42a is similar to the image drawn on the optotype of a general refractive power measuring device. It is an arranged image. This image may be the same as the training image described later (for example, Fig. 14 (a) (b)). The control unit 45 also stores the image data of this image in memory in advance.

 Next, a procedure for determining an image for training and a procedure for displaying a general image will be described. In the training image determination procedure, for example, various training images as shown in FIGS. 14 (a) and (b) are displayed on the display 42a on the display 42a (step S4). 1).

 The display method is, for example, a method of sequentially switching to another type of training image while displaying one type of training image for a predetermined time, such as a so-called “slide show”. At this time, the user can examine which training image to select while viewing a plurality of training images that change sequentially.

 Then, the control unit 45 stores the type of the training image displayed at the time when the image selection button 48 is pressed (step S42 YES) in the memory, assuming that the user desires the type. (Step S43). The information stored in this way is used in a later training scan procedure. In other words, the user simply selects the image selection button 48 when a desired type of training image is displayed, and the HMD 4 with the eye fatigue eliminating device is used to use the training image during training. Can be specified.

In addition, since the HMD 4 with an eye fatigue eliminating device is provided with a speed force 49, in this training image determination procedure, the control unit 45 sends a voice guide from the speaker 49. Is also good. For example, immediately after starting the execution of step S41, select " Please do it. "

 It is assumed that the voice guide voice data is stored in the memory of the control unit 45 in advance. Here, as shown in Fig. 14 (a) and (b), the training image is located at a position (near the center) where the eyes 40 can easily perceive and the line of sight can be easily determined (front and back). This is an image in which a noticeable picture (such as a car, yacht, or other thing that can move back and forth) is arranged so that it does not cause any discomfort even if it is moved to a location.

 Also, in the training image, the background of the drawing of interest is a nearly uniform background (eg, plains, sea, mountains, etc.) so as to minimize flicker. This background is preferably as close as possible to the natural scenery. Adopting such a background can increase the degree of user relaxation during training.

 Next, in the general image display procedure, the control unit 45 displays the general image on the display 42a based on the image data of the general image output from the video output unit 41 (step S5). 4 4). At this time, the control unit 45 emits sound from the speaker 49 based on the audio data output together with the image data and accompanying the image data.

 When the display of the general image is completed as described above (step S45), the training survey procedure is immediately executed. The image displayed on the display 42 a in this training scanning procedure is the type of training image stored in step S 43 (the type of training image selected by the user).

 In the training in the present embodiment, a favorite image that the user has more interest in is used. Since the speaker 49 is provided in the HMD 4 with the eye fatigue ^ S eraser, the control unit 45 may flow a voice guide from the speaker 49 in this training scanning procedure.

 For example, immediately after the start of the execution of step S6 ', a voice guide of "Pay attention to the image" is played, or when YES is obtained in step S10, a voice guide of "training has ended" is played. Or better. It is assumed that the voice data of these voice guides is stored in the memory of the control unit 45 in advance.

In the present embodiment, the training image during scanning (step S7 ') may be changed as follows using the moving image display function of the display 42a. FIG. 15 is a diagram for explaining a change in the training image. In Fig. 15, the left side is the near side based on the eye 40. Yes, the right side is far from the eye 40. Further, (a), (b), and (c) in FIG. 15 show each training image displayed when the display 42 a is located at different positions.

 First, what changes with the change in the position of the display 42 a is the size ratio of the attention picture (yacht) to the background (sea) in the training image. At this time, the types of training images (background: sea, featured picture: yacht) do not change. Further, this ratio gradually changes as the position of the display 42 a changes, and decreases as the distance increases, and increases as the distance increases.

 At this time, it is preferable that the size of the background (sea) viewed from the eyes 40 be kept constant. As a result, the user can perceive the training image as a natural landscape in which only the attention picture (yacht) is far from his near to far away. As described above, if the display contents during training are close to the natural scenery, the degree of relaxation of the user during training can be further increased.

 However, in order to realize this display, the image data (that is, moving image data) of each training image to be displayed when the display 42 a is at each position is stored in the memory of the control unit 45 in advance. Is done. Needless to say, when multiple types of training images are prepared, it is necessary to prepare moving image data for each type. Further, in order to obtain a further relaxing effect, the control unit 45 may play a gentle music or a natural sound (such as the sound of the sea) from the speaker 49 during the execution of the training scanning procedure. In this case, the sound data of the music or the natural sound is stored in the memory of the control unit 45 in advance.

 In this way, the degree of relaxation of the user can be further increased. However, in the present embodiment, since the eye fatigue eliminating device is combined with the HMD, the elements (projection unit 42, mirror 43, speaker 49, etc.) provided in the HMD can be used effectively. Therefore, as compared with the case where the eye fatigue eliminating device and the HMD are manufactured separately, the manufacturing cost and the arrangement space thereof are reduced.

Note that the training scanning procedure in the present embodiment is executed after the general image display procedure is completed. However, if the display of a general image (such as a movie) is performed for a long time, the training scan procedure is inserted during the general image display procedure. You may. Further, in the present embodiment, the training scanning procedure (and the pre-measurement procedure and the training image determination procedure) are combined with the general image display procedure, but may be performed independently in accordance with an instruction from the user. Good. Further, in the present embodiment, the convex lens 42 c (see FIG. 12) has been described as an example of an optical element for making the image of the display 42 a look distant, but other optical elements (such as a hologram element) It goes without saying that may be used.

<Fifth embodiment>

 A fifth embodiment of the present invention will be described based on FIG. 16 and FIG.

 FIG. 16 is a diagram showing the configuration and appearance of the HMD 5 with an eye fatigue eliminating device of the present embodiment. Here, only differences from the fourth embodiment will be described, and other description will be omitted. The HMD 5 with an eye fatigue eliminating device of the present embodiment is obtained by adding a communication control circuit 52 to the HMD 4 with the eye fatigue eliminating device of the fourth embodiment.

 The control unit 55 in the HMD 5 with the eye fatigue eliminating device can perform data communication with an external eye information measuring device 51 via the communication control circuit 52. Here, the eye information measuring device 51 is a refractive power measuring device (generally referred to as an auto-ref, known in Japanese Patent Application Laid-Open No. 6-165757, etc., and has the same principle as the refractive measuring unit 11 (FIG. 2)). ) And a spectacle power measuring device (commonly referred to as a lens meter, known in Japanese Patent Application Laid-Open No. 11-304654). Far-point information (sight, eyeglass power, far-point position, etc.) indicating the far-point position of the eye 40 is transmitted from the eye information measuring device 51 (measurement for the eye 40 is performed in advance. Yes.) FIG. 17 is an operation flowchart executed by the control unit 55 of the present embodiment. In FIG. 17, the same steps as those shown in FIG. 13 are denoted by the same reference numerals. The operation flow chart of the present embodiment is different from the operation flow chart of the fourth embodiment shown in FIG. 13 in that the pre-measurement procedure (S 2 ′, S 3 ′, S 24, S 5 ′) is replaced. The far point position acquisition procedure (steps S51 and S5 ') is inserted. The far point position acquisition procedure is to recognize the far point position DO of the eye 40 based on the far point information transmitted from the eye information measuring device 51, as is clear from FIG.

Here, for example, when the far-point information transmitted from the eye information measuring device 51 is a visual acuity value, the control unit 55 uses the conversion table (see FIG. 11) described in the third embodiment. Preferably, it is stored in memory. By referring to this conversion table, the visual acuity of the eye 40 can be converted into the far point position DO. As described above, if the far point position DO is obtained based on far point information measured in advance by the eye information measuring device 51 without relying on the operation of the far point input switch 57 by the user, the far point Measurement error of position DO is suppressed, and diopter adjustment (step Step S5 ') and the training scan (steps S6' to S10) are performed more appropriately.

 In the present embodiment, the far point input switch 57 may be omitted. In addition, since eye information measuring instruments such as an autoref and a lens meter are often used in hospitals, the HMD 5 with an eye fatigue eliminating device of the present embodiment that can communicate with these measuring instruments is used in hospitals and the like. Useful when using.

<Sixth embodiment>

 A sixth embodiment of the present invention will be described based on FIGS. 18, 19, 20, and 21. FIG.

 Here, only differences from the first embodiment will be described, and other description will be omitted. The eye fatigue eliminating device of the present embodiment is obtained by adding a function of measuring the degree of eye fatigue to the eye fatigue eliminating device 1 of the first embodiment. The function of measuring the degree of eye fatigue can be added simply by adding the operation shown in Fig. 18 to the operation of the control unit, and there is no need to change the hard wafer.

 However, it is assumed that the control unit of the present embodiment can detect a change in the eye refractive power of the trained eye 10 at a relatively short period of 0.1 second or less. Because, in the present embodiment, the appearance frequency (described later) of the high-frequency component is calculated from at least the change in the eye refractive power acquired in step S62 of FIG. This is because it is necessary to sample the data overnight.

 Fig. 18 is an operation flow chart of the control unit (corresponding to the fatigue measurement means) when measuring the eye fatigue. It is assumed that the pre-measurement procedure (see FIG. 3) has been executed prior to this operation flowchart. This operation flowchart includes a main measurement procedure (steps S61 to S64), an analysis procedure (step S65), and a result display procedure (step S66). '

 In this measurement procedure, the optotype 12a is arranged at a predetermined position with reference to the far-point position DO (step S61). Then, the optotypes 12a are continuously arranged at the same position for a predetermined time T, and a temporal change in the eye refractive power at that time is monitored (step S62). Hereinafter, the data obtained by this monitoring is referred to as “temporal changes in eye refractive power over time”.

Further, the appearance frequency of a predetermined high-frequency component is calculated as an index of the degree of fatigue from the change over time of the eye refractive power obtained in this manner (step S65, details will be described later). Note that, as in step S61, the position where the optotype 1 2a is placed is If the ten characteristics (far point DO) are used, the degree of fatigue of each trained eye 10 can be measured under a unified standard.

 By the way, the reason why the frequency of occurrence of a predetermined high frequency component is adopted as an index indicating the degree of fatigue is as follows. In general, even if the eye intends to look at an object located at a certain distance, the eye refracts the sinusoidal power of the eye. This fine movement of the eye refractive power is called "accommodation fine movement". When the eyes are fatigued, the specific 髙 frequency component of the accommodative tremor increases, and the frequency of occurrence increases as the degree of fatigue increases. This is a fact derived from medical research.

 In the following, of the adjustment tremors, this specific high-frequency component whose frequency of occurrence increases due to fatigue is referred to as “fatigue tremor”. In addition, the above-mentioned time T (a period during which the change of the eye refractive power over time is sampled) is about 8 seconds or more, and about 20 seconds or less that does not cause the trained eye 10 to be tired of staring. is there. The reason why the time is about 8 seconds or more is that a sufficient amount of data needs to be sampled in order to maintain the accuracy of the calculation for calculating the frequency of appearance of the frequency component (step S65). In the following, it is assumed that T = 20 sec.

 By the way, the manner of occurrence of fatigue tremor varies depending on the visibility of the target 12a, that is, the position of the target 12a (target position) with respect to the far-point position DO of the trained eye 10. You.

 Therefore, it is preferable that the degree of fatigue is obtained for each of the different target positions α ′ 1, I,. Therefore, the present measurement procedure preferably includes the following steps. That is, first, the optotype 12a is arranged at a position (DO + a'0) slightly farther from the far point position DO (step S61).

 Note that the position (DO + Q! '0) is a position where the trainee's eye 10 cannot make a clear vision of the target 12a even if it adjusts, but the target 12a is not too blurry. The arrangement at such a position (D0 + H0) is for suppressing unnecessary movement of the trained eye 10. Therefore, 0 is preferably about 0.5 Dp. Then, the target 1 2a moves from the position (D0 + 0) one step closer (for example, 0.5 Dp) (by shifting α 'in the minus direction) (step S64), and At the mark positions (α'1, α'2,

The temporal change data of the eye refractive power is obtained (step S62). This step movement and The data acquisition is repeated until the position of the target 12a is sufficiently close to the predetermined position (DO + 'n) (Step S63 YES) (α'n = -3Dp).

Note that the temporal change data of each eye refractive power acquired in step S62 is associated with the target position i at the time of each acquisition as data used in the next analysis procedure (step S65). And stored in the memory. FIG. 19 is a diagram illustrating the analysis procedure (step S65 in FIG. 18). FIG. 19A is a diagram showing temporal change data of eye refractive power obtained at a certain target position a ′ i. 19 the horizontal axis represents the elapsed time within a predetermined time T (a) (sec), the vertical axis (based on the far point position DO) eye refractive power (Dp) in which _c First, aging of the eye refractive power The data includes information when the trained eye 10 blinks. Since the signal value output from the refraction measuring unit 11 (see FIG. 2) when the trained eye 10 is blinking indicates the reflected light on the eyelids of the trained eye 10, the trained eye 10 blinks. As shown by the arrow in Fig. 19 (a), the data at this time show significantly different values compared to other data.

 Therefore, the control unit discriminates and removes data (arrows) in which the eye refractive power is significantly deviated from the temporal change data of the eye refractive power (FIG. 19 (a)). Then, the data of that part is interpolated by the data close to it. This interpolation is, for example, spline interpolation

(Cubic spline interpolation). Figure 19 (b) shows the temporal change data of the eye refractive power after interpolation.

 In this way, if the data at the time of blinking is removed, the degree of fatigue can be determined more accurately. Some refraction measuring units 11 (see Fig. 2) are equipped with a function to automatically remove the moment of blinking from the inside. If it is added, it goes without saying that the removal processing by the control unit is unnecessary.

 Next, the spectral parameter of the temporal change data of the eye refractive power after this interpolation (FIG. 19 (b)) is calculated. For this calculation, a Fourier transform, for example, FFT (Fast Fourier. Cosine'Sine Transform) is applied. Here, in this embodiment, not only the degree of fatigue at each target position a ′ i (i = 0 to n), but also the change in the degree of fatigue within the time T is examined. The power is calculated for each section within the time T as a conversion target.

In the following, each section is set to be shifted by 1 second within the time T, and the time in each section is For 8 seconds. FIG. 19 (c) is a diagram illustrating the spectral power calculated for a certain section in time T as a conversion target. In Fig. 19 (c), the horizontal axis is frequency, and the vertical axis is the logarithm of spectral power.

 Here, as described above, it has been found that the fatigue tremor has a certain high frequency. This frequency is between 1 and 2.3 Hz. Therefore, the control unit calculates the integrated value of the spectral power at the high frequency component of 1 to 2.3 Hz (the area of the shaded area in the graph of Fig. 19 (c)) as the frequency of occurrence of fatigue tremor.

 Then, the calculation of the appearance frequency of the fatigue tremor as described above is performed for each section of each target position a ′ i (i = 0 to n) (the above, step S 65). Incidentally, Fig. 19 (d) shows the fatigue characteristics obtained for the 12 sections at the same target position α'i.

It is the figure which plotted the appearance frequency of the tremor. The vertical axis in Fig. 19 (d) is the frequency of appearance. Incidentally, the horizontal axis is the average value of the eye refractive power (based on the far point DO) in each section.

 Thereafter, the control unit displays the result obtained in step S65 in FIG. 18 on the display 16 as shown in, for example, FIGS. 20 and 21 (step S66). FIG. 20 and FIG. 21 are diagrams showing the appearance frequency of fatigue tremor for each target position a ′ i (i = 0 to n) and for each section. The displayed information is preferably a graph (bar graph) showing the frequency of appearance of the fatigue tremor, as shown in FIGS. 20 and 21, rather than the numerical value itself. With this display, the user can visually confirm the degree of fatigue. In these figures, the higher the frequency of appearance, the higher the density of the bar graph. (Note that the vertical axis indicates the average value of the eye refractive power (based on the far point DO) in each section. ). In addition, in the display, the frequency of appearance of fatigue tremor is different in several stages (for example, 7 stages of ~ 45, 45 ~ 50, 50 ~ 55, 55 ~ 60, 60 ~ 65, 65 ~ 70, 70 ~) It is preferable to be classified as

The information may be color-coded so that as much information as possible can be obtained from one screen. For example, high frequencies are indicated by red, low frequencies by green, and intermediate frequencies by colors between red and green. Here, FIG. 20 shows the result obtained when measuring the trained eye 10 that is not tired, and FIG. 21 shows the result obtained when measuring the trained eye 10 that is tired. First, as is clear from both FIG. 20 and FIG. 21, as the position of the optotype 12a moves from the far point position DO (α ′ = 0) to the near side (<0), adjustment of the trained eye 10 is performed. As the volume increases, the frequency of the appearance of fatigue tremor gradually increases. However, comparing FIG. 20 with FIG. 21, overall frequency of occurrence of fatigue tremor is higher in the tired trained eye 10 than in the non-fatigued trained eye 10. I understand.

 In addition, comparing FIG. 20 with FIG. 21, regarding the trained eye 10 that is tired, not only the overall appearance frequency is high, but also the position of the target 12 a is the distant position DO (α It can be seen that the fatigue tremor has already appeared when it is close to '= 0). In other words, when the fatigue of the trained eye 10 increases, the position of the target 12a at the start of the fatigue tremor approaches the far point position DO (a '= 0).

 Therefore, the user can determine the state of the degree of fatigue for the trained eye 10 by setting the overall appearance frequency of the fatigue tremor displayed on the display 16 or the appearance frequency of the fatigue tremor to be a predetermined value or more. It can be read from the target position α 'at the time. Incidentally, the appearance pattern of this fatigue tremor (not the appearance frequency, but the change in the appearance frequency with respect to the target position α ') is fixed to the trained eye 10 by the kind of fatigue gradually accumulated over a long period of time. Tend to be That is, the appearance pattern of the fatigue tremor is almost unique to the trained eye 10.

 Therefore, the user can read the appearance pattern of the fatigue tremor from the display on the display 16 and know the target position of the trained eye 10 where the trainee's eye 10 is likely to be tired and the target position where the trainee's eye 10 is less tiring. In addition, such an appearance pattern also serves as a guide for determining the power of the spectacles and the connecting lens to be used for the trained eye 10.

 As described above, in the present embodiment, the degree of fatigue is obtained based on the change in the refractive power detected by the refraction measuring unit 11 (see FIG. 2) when the target is in the stopped state. In addition, as an index of the degree of fatigue, the frequency of occurrence of medically significant tremor is required. In the present embodiment, since the measurement is performed a plurality of times while moving the target 12a, the state of the type of fatigue gradually accumulated in the trained eye 10 over a long period of time (the appearance pattern of the above-mentioned fatigue tremor) ) Is also apparent.

Supplement to the sixth embodiment>

In the sixth embodiment, the index of the degree of fatigue is referred to as “the target while the target 12a is stopped. Frequency of fatigue tremors in the training eyes ", but other indices can be used. For example, "the timing delay of adjustment of the trained eye 10 when the position of the target 12a is moved (follow-up delay)" or "the eye 1 when the position of the target 12a is moved" 0 adjustment speed (follow-up speed) ".

 In the present embodiment, the moving direction of the optotype may be a direction opposite to the above. It is preferable that the measurement of the degree of fatigue be performed before the training. It is preferable that the specific training content such as the number of scans is determined according to the measured degree of fatigue.

 For example, if the number of scans is increased as the degree of fatigue is higher, the necessary amount of training can be performed in accordance with the degree of fatigue of each trained eye 10, which is efficient.

<Others>

 In each of the above embodiments, a method of actually moving the optotype (display) when scanning the apparent position of the optotype (display) is employed. If so, any other method such as moving the optical system instead of the target may be employed.

 Further, in each of the above embodiments, the direction of movement of the optotype (display) during training by the control unit may be the opposite direction to that described above. It is also possible to mix both directions from near to far and far to near. In addition, each of the above embodiments can be configured for any of monocular and binocular.

 In the above description, in addition to the eye fatigue eliminating device (the first, second, and third embodiments), the HMD with the eye fatigue eliminating device (the fourth and fifth embodiments), the eye An example of a device equipped with two types of functions, such as an eye fatigue eliminating device with a function for measuring fatigue (sixth embodiment), has been described. It is also possible to configure a device equipped with three functions of an eye fatigue eliminating device, an HMD and an eye fatigue measuring device.

Among them, the device equipped with the two functions of the eye fatigue measurement device and the HMD can use the HMD display as a target used for measuring the eye fatigue degree. The eye fatigue measurement device requires a projection unit 12 and a refraction measurement unit 11 (Fig. 2), and the HMD uses a projection unit 42 (Fig. 12) and a head fixing unit 4a (Fig. 12). The eye fatigue eliminating device requires the projection unit 12 In an apparatus equipped with any two or more of these functions, at least one of the elements can be used for those functions, so that manufacturing costs and arrangement space can be reduced.

Claims

The scope of the claims

1. An image projection unit that projects an image to the trained eye,

 A scanning mechanism that scans the position of the image with respect to the trained eye in the optical axis direction of the trained eye;

 An eye fatigue eliminating device including a control unit that controls the scanning mechanism,

 The control unit causes the scanning mechanism to perform a training scan for scanning the position of the image, and acquires far point information indicating a far point of the trained eye prior to the training scan. The scan range of the image in the training scan is set according to the far-point information.

2. The eye fatigue eliminating device according to claim 1,

 The scanning range is set near a position corresponding to the far point when viewed from the trained eye.

3. The eye fatigue eliminating device according to claim 2,

 The scanning range is set to a range from a position closer to the far point to a position farther than a position corresponding to the far point when viewed from the trained eye.

4. In the eye fatigue eliminating device according to claim 2 or claim 3,

 Further comprising a refraction change detection unit that detects a change in the refractive power of the trained eye,

 In acquiring the far-point information, the control unit causes the scanning mechanism to scan the position of the image at least once in the optical axis direction of the eye to be trained, and obtains the far-point information during the scanning. It is obtained based on the change detected by the change detection unit.

5. In the eye fatigue eliminating device according to claim 2 or claim 3,

 The trainee having the trained eye further includes an interface unit for inputting clear vision information indicating whether or not the image can be clearly seen,

In acquiring the far-point information, the control unit causes the scanning mechanism to scan the position of the image at least once in the optical axis direction of the eye to be trained. Then, it is obtained based on the clear vision information input from the trainee via the interface unit.

6. In the eye fatigue eliminating device according to claim 2 or claim 3,

 An interface unit for inputting, from outside, visual acuity information indicating the visual acuity of the trained eye,

 The control unit acquires the far point information based on the visual acuity information input from the outside via the interface unit.

7. The eye fatigue eliminating device according to claim 4,

 The control unit causes the scanning mechanism to perform the scan a plurality of times during the training scan, and obtains the far point information based on a change detected by the refraction change detection unit during the scan, When the far point information acquired during the training scan changes, the scan range of the image is updated according to the change.

8. The eye fatigue eliminating device according to claim 4 or claim 5,

 Further comprising a display for displaying information externally in response to an instruction from the control unit, wherein the control unit acquires the far-point information after the end of the training scan, and the acquired far-point information; The difference from the far point information acquired prior to the training scan is obtained, and the display is instructed to display the difference as an effect of the training scan.

9. Eye fatigue relieving device,

 An image projection unit that projects an image on the trained eye,

 A fixing unit that fixes the image projection unit to the trainee having the trained eye; and a scanning mechanism that scans the position of the image with respect to the trained eye in the optical axis direction of the trained eye. When,

A control unit for causing the scanning mechanism to perform a training scan for scanning the position of the image a plurality of times.

10. The eye fatigue eliminating device according to claim 9,

 The image projection unit includes a two-dimensional image display for displaying a general image input from the outside.

11. The eye fatigue eliminating device according to claim 10,

 The control unit sets an image to be displayed by the image projection unit to a predetermined training image instead of the general image during the training scan.

1 2. The eye fatigue eliminating device according to claim 11,

 An interface unit for externally selecting one of a plurality of types of training images, wherein the control unit is configured to display the training image to be displayed by the image projection unit during the training scan; To the one selected via.

13. The eye fatigue eliminating apparatus according to any one of claims 9 to 12, wherein the control unit performs the training scan at a predetermined timing during the display of the general image or after the display of the general image is completed. The scanning mechanism is performed.

1 4. The eye fatigue eliminating device according to any one of claims 9 to 13, further comprising an audio output unit that emits audio.

 The control unit causes the audio output unit to output a predetermined training audio during the training scan.

15. The eye fatigue eliminating apparatus according to any one of claims 9 to 14, wherein the control unit is distant point information indicating a distant point of the eye to be trained prior to the training scan. The scan range of the image in the training scan is set according to the far-point information.

16. The eye fatigue eliminating device according to any one of claims 1 to 8,

The apparatus may further include a fatigue measurement unit that measures the fatigue of the training eye.

7. The eye fatigue eliminating device according to any one of claims 9 to 15, further comprising a fatigue degree measuring unit that measures the degree of fatigue of the training eyes.