Subjective optometry apparatus and subjective optometry method

Abstract

To provide a subjective optometry apparatus and a subjective optometry program capable of smoothly performing an examination.SOLUTION: The visual target presenting device includes a visual target presenting means for presenting an examination visual target to an eye to be examined, a distance changing means for optically changing a visual target presenting distance, a visual target registering means for registering a high frequency visual target, and a control part, and can switch a plurality of measurement modes having at least different visual target presenting distances. When the high frequency visual target to be displayed by the visual target presentation unit is switched to a high frequency visual target of another measurement mode different from the measurement mode of the high frequency visual target being displayed, the control unit changes the visual target presenting distance from the visual target presenting distance of the measurement mode before the switching to the visual target presenting distance corresponding to the measurement mode of the high frequency visual target after the switching. And a measurement mode switching step of switching the measurement mode.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a subjective optometry device that subjectively measures optical characteristics of a subject's eye, and a subjective optometry program executed in the subjective optometry device. [Background technology]

[0002] BACKGROUND ART There is known a subjective optometry device that measures optical characteristics of a subject's eye by placing an optical element in front of the subject's eye and presenting a test target to the subject's eye via the optical element (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-18712 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the demand for progressive lenses has been increasing, and there are more opportunities to perform tests at different optotype presentation distances (for example, performing a series of tests for distance and near distances). When performing tests at different optotype presentation distances, the operator must switch the optotype presentation distance and display test optotypes corresponding to the optotype presentation distance, which makes the device operation in the series of tests complicated and time-consuming. Furthermore, when an inexperienced operator performs a series of tests, it can take time to find the desired test optotype and can lead to mistakes.

[0005] In view of the above-described conventional techniques, the present disclosure has as its technical object to provide a subjective optometry device and a subjective optometry program that enable smooth examinations. [Means for solving the problem]

[0006] In order to solve the above problems, the present disclosure is characterized by having the following configuration.

[0007] (1) A subjective optometry device according to a first aspect of the present disclosure is a subjective optometry device for subjectively measuring optical characteristics of an eye to be examined, and includes: an optotype presenting means for presenting a test optotype to the eye to be examined; a distance changing means for optically changing an optotype presenting distance of the test optotype; an optotype registration means for registering a high-frequency optotype, which is a test optotype that is used more frequently than other test optotypes, among a plurality of test optotypes that can be displayed on the optotype presenting means; and a control unit. The subjective optometry device is capable of switching between a plurality of measurement modes in which the optotype presenting distances when measuring the optical characteristics of the eye to be examined are different from one another, and the control unit includes a registration step for registering the plurality of high-frequency optotypes in the optotype registration means for each of the measurement modes; The method is characterized by executing a high-frequency target switching step of switching the high-frequency target to be displayed on the target presenting means, among the plurality of high-frequency targets registered in the target registration means for each measurement mode, in accordance with an instruction input by an operator; and a measurement mode switching step of switching the measurement mode by controlling the driving of at least the distance changing means to change the target presentation distance from the target presentation distance corresponding to the measurement mode of the high-frequency target before switching to the target presentation distance corresponding to the measurement mode of the high-frequency target after switching, when the high-frequency target to be displayed on the target presenting means is switched to a high-frequency target of another measurement mode different from the measurement mode of the high-frequency target being displayed. (2) A subjective optometry program according to a second aspect of the present disclosure is a subjective optometry program executed in a subjective optometry device that subjectively measures optical characteristics of a subject's eye, the subjective optometry device having: optotype presenting means for presenting test optotypes to the subject's eye; distance changing means for optically changing the optotype presenting distance of the test optotypes; optotype registration means for registering a high-frequency optotype, which is a test optotype that is used more frequently than other test optotypes, among a plurality of test optotypes that can be displayed on the optotype presenting means; and a control unit. The subjective optometry program is executed by the control unit of the subjective optometry device, thereby performing a registration step of registering the plurality of high-frequency optotypes in the optotype registration means for each of the measurement modes; The subjective ophthalmological examination device is characterized in that it is made to execute the following steps: a high-frequency optotype switching step of switching the high-frequency optotype to be displayed on the optotype presenting means, among the plurality of high-frequency optotypes registered in the registration means for each of the measurement modes, in accordance with an instruction input by an operator; and a measurement mode switching step of switching the measurement mode by controlling the driving of at least the distance changing means when the high-frequency optotype to be displayed on the optotype presenting means is switched to a high-frequency optotype of another measurement mode different from the measurement mode of the high-frequency optotype being displayed, to change the optotype presenting distance from the optotype corresponding to the measurement mode of the high-frequency optotype before switching to the optotype presenting distance corresponding to the measurement mode of the high-frequency optotype after switching. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an external view of a subjective optometry device. [Figure 2] FIG. 2 is a schematic diagram of a projection optical system. [Figure 3] FIG. 2 is a schematic diagram of an eye refractive power measuring unit. [Figure 4] FIG. 2 is a schematic diagram of a control system. [Figure 5] 10A shows an example of an operation screen of the examiner's controller in a distance measurement mode, and FIG. 10B shows an example of an operation screen of the examiner's controller in a near measurement mode. [Figure 6]10A and 10B are examples of the operation screen of the examiner's controller, showing (a) an operation screen in the process of registering a high-frequency distance target, and (b) an operation screen after registration of multiple high-frequency distance targets has been completed. [Figure 7] 10 is an example of an operation screen including a display area for a high-frequency target for distance use, a display area for a high-frequency target for intermediate use, and a display area for a high-frequency target for near use. [Figure 8] 10 is an example of an operation screen when a display area for a high-frequency target for distance use and a display area for a high-frequency target for near use are switched between and displayed. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Summary> An overview of the subjective optometry device according to this embodiment will be described. The items grouped in < > below can be used independently or in conjunction with each other.

[0010] The subjective ophthalmology device of the present disclosure is a device for subjectively measuring optical characteristics of a subject's eye. For example, the optical characteristics of the subject's eye may be ocular refractive power (e.g., at least one of spherical power, cylindrical power, and astigmatic axis angle), binocular vision function (e.g., at least one of prism amount and stereoscopic vision function), contrast sensitivity, and the like.

[0011] The subjective ophthalmology device of the present disclosure may include a target presenting means. The target presenting means presents a target to the subject's eye. For example, the target presenting means may include a display (e.g., display 31). As an example, the display may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence) display, or the like. For example, the target presenting means may be a light source and a target plate. For example, the target presenting means may be a light source and a DMD (Digital Micromirror Device). Furthermore, the target presented by the target presenting means of the present disclosure may be at least one of a directional target (e.g., a Landolt ring target, a Tumbling E target, etc.) for enabling the subject to identify directions, a character target (e.g., a hiragana target, a katakana target, an alphabet target, etc.) for enabling the subject to read letters, a number target (e.g., a number target) for enabling the subject to identify numbers, etc. Furthermore, for example, the visual target may be at least one of a visual target consisting of one visual target (for example, a single-letter visual target, etc.), a group of visual targets consisting of multiple visual targets (for example, a horizontal row visual target, a vertical row visual target, a character-filled visual target, etc.), etc.

[0012] The target light beam from the target presenting means may be guided directly toward the subject's eye. Alternatively, for example, the target light beam from the target presenting means may be guided toward the subject's eye via a light projection optical system (e.g., the light projection optical system 30). For example, the light projection optical system may have at least one optical element through which the target light beam emitted from the target presenting means passes. For example, it may have at least one of a lens, a mirror, and the like.

[0013] The subjective optometry device of the present disclosure may include a distance changing means. The distance changing means optically changes the optotype presentation distance of the test optotype. For example, the distance changing means may have a configuration for optically changing the presentation position (presentation distance) of the optotype relative to the eye to be examined. As an example, the distance changing means may have a configuration for moving the optotype presenting means in the optical axis direction, or may have a configuration for moving an optical element (e.g., a spherical lens) in the optical path in the optical axis direction. Furthermore, for example, the correction means may have a driving means for moving the optotype presenting means in the optical axis direction. Furthermore, for example, the distance changing means may have a driving means for moving an optical element in the optical path in the optical axis direction. In this case, the optical characteristics of the optotype light beam are changed by controlling the driving means for moving at least one of the optotype presenting means and the optical element.

[0014] The subjective optometry device of the present disclosure may include a control unit (e.g., control unit 40). The control unit includes a controller (e.g., examiner controller 10) that controls the subjective optometry device. For example, an operation instruction for switching the test optotype to be displayed on the optotype presenting means may be input to the control unit. In this case, an operation instruction from a user, i.e., an operator (e.g., an examiner or an assistant), may be input to the control unit. As an example, the control unit may include at least one user interface such as a switch, a touch panel, a mouse, a keyboard, etc.

[0015] The subjective optometry device of the present disclosure may include a target registration means (e.g., a memory 50). The target registration means registers a plurality of high-frequency target optotypes, which are test targets that are used more frequently than other test targets, among a plurality of test targets that can be displayed on the display means. More specifically, among a plurality of types of test targets that can be presented in tests of the subject's eye, test targets that are frequently presented by each facility, store, or operator in tests of the subject's eye are registered as high-frequency target optotypes. For example, the aforementioned Landolt ring target, Tumbling E target, Hiragana target, Katakana target, alphabet target, numeric target, etc. may be registered in the target registration means. Of course, the information registered in the target registration means is not limited to the type of test target and may include other settings. For example, the information registered in the target registration means may include at least one of settings such as whether or not an auxiliary lens is provided, whether or not the test target is displayed in black and white, and whether or not a glare lamp is turned on. The optotype registration means may be a storage device provided outside the subjective optometry apparatus (for example, a storage device provided in an external device).

[0016] The subjective optometry device of the present disclosure can switch between multiple measurement modes with different optotype presentation distances when measuring at least the optical characteristics of the subject's eye. Therefore, multiple measurements with different optotype presentation distances can be smoothly performed by a single device.

[0017] The control unit of the subjective optometry device of the present disclosure may execute a registration step. In the registration step, the control unit registers multiple high-frequency optotypes in the optotype registration means for each measurement mode. For example, the multiple measurement modes may include at least one of a distance measurement mode in which the optotype presentation distance is a distance distance (e.g., 5 m), an intermediate measurement mode in which the optotype presentation distance is an intermediate distance (e.g., 1 m intermediate between the distance distance and the near distance), and a near measurement mode in which the optotype presentation distance is a near distance (e.g., 40 cm). More specifically, for example, a high-frequency optotype for measuring the optical characteristics of the subject's eye in the distance measurement mode and a high-frequency optotype for measuring the optical characteristics of the subject's eye in the near measurement mode may be registered in the optotype registration means. For example, the test optotypes that are frequently used for each measurement mode may differ depending on the operator. Therefore, by registering multiple high-frequency optotypes in the optotype registration means for each measurement mode, the operator can easily select a high-frequency optotype appropriate for the measurement mode. Furthermore, by being able to register high-frequency optotypes according to the measurement mode, even an inexperienced operator can easily distinguish the test optotype to be used for each measurement mode, allowing the test to be carried out smoothly.

[0018] The control unit of the subjective ophthalmology device disclosed herein may execute a high-frequency optotype switching step and a measurement mode switching step. In the high-frequency optotype switching step, the control unit switches the high-frequency optotype to be displayed on the optotype presenting means from among a plurality of high-frequency optotypes registered for each measurement mode in the optotype registration means in response to an instruction input by the operator. In the measurement mode switching step, when the high-frequency optotype to be displayed on the optotype presenting means is switched to a high-frequency optotype of a measurement mode different from the measurement mode of the high-frequency optotype currently being displayed, the control unit controls the driving of at least the distance changing means to change the optotype presenting distance from the optotype presenting distance corresponding to the measurement mode of the high-frequency optotype before switching to the optotype presenting distance corresponding to the measurement mode of the high-frequency optotype after switching, thereby switching the measurement mode. For example, when a high-frequency optotype for the distance measurement mode registered in the optotype registration means is displayed and the operator selects a high-frequency optotype for the distance measurement mode, the optotype display means may display the high-frequency optotype for the distance measurement mode, and the presentation distance of the test optotype for the subject's eye may be optically changed from the near distance to the far distance. In conventional subjective optometry devices, when performing an examination at different optotype presentation distances, the operator had to perform an operation to switch the optotype presentation distance and also an operation to display the test optotype corresponding to the optotype presentation distance, which made the device operation complicated and time-consuming. However, with the technology disclosed herein, the operator can easily set both the optotype presentation distance and the test optotype corresponding to the optotype presentation distance by simply selecting a high-frequency optotype registered for each measurement mode from the registered high-frequency optotypes. Furthermore, the operator can easily switch the optotype presentation distance and the test optotype corresponding to the optotype presentation distance by selecting a high-frequency optotype registered for each measurement mode. Therefore, the operator can more smoothly perform a series of tests with different target presentation distances.

[0019] The subjective ophthalmology device of the present disclosure may include a correcting means (e.g., an eye refractive power measuring unit 20). The correcting means changes the optical properties of the visual target light beam emitted from the visual target presenting means. For example, the correcting means changes the optical properties of the visual target light beam emitted from the visual target presenting means. For example, the optical properties of the visual target light beam may be at least one of the spherical power, cylindrical power, astigmatism axis angle, etc. of the visual target light beam. For example, the correcting means may include a corrective optical system as part of its configuration. For example, the corrective optical system is arranged in the optical path of the light projection optical system and changes the optical properties of the visual target light beam.

[0020] For example, the corrective optical system may be configured to change the optical characteristics of the visual target light beam. For example, the corrective optical system may change the spherical power of the visual target light beam by optically changing the presentation distance of the test visual target relative to the eye to be examined. Furthermore, for example, the corrective optical system may include an optical element. For example, the optical element may be at least one of a spherical lens, a cylindrical lens, a variable-focus lens, a cross cylinder lens, a rotary prism, a wavefront modulation element, and the like. Of course, the optical element may be different from these. Furthermore, for example, the corrective means may include a driving means for driving the optical element. In this case, the optical characteristics of the visual target light beam are changed by controlling the driving means for driving the optical element.

[0021] Furthermore, for example, the correcting means may be an eye refraction measurement unit (e.g., eye refraction measurement unit 20) that switches and positions an optical member (e.g., optical element 28) in front of the subject's eye via an examination window (e.g., examination window 23). For example, the eye refraction measurement unit may have a lens disk (e.g., lens disk 27) on which a plurality of optical elements are arranged on the same circumference. In this case, the optical characteristics of the visual target light beam are changed by controlling a driving means for controlling the lens disk. Note that the correcting means may have a different configuration from these.

[0022] The correction means may include a convergence angle change means for changing the convergence angle between the target light beam emitted to the right eye of the subject and the target light beam emitted to the left eye of the subject. By changing the convergence angle by the convergence angle change means, each of a plurality of measurement modes with different target presentation distances can be appropriately performed.

[0023] In the measurement mode switching step, when the high-frequency optotype displayed on the optotype presenting means is switched to a high-frequency optotype of a measurement mode different from the measurement mode of the currently displayed high-frequency optotype, the control unit may switch the measurement mode by controlling the drive of the convergence angle changing means to change the convergence angle from that corresponding to the measurement mode of the high-frequency optotype before switching to that corresponding to the measurement mode of the high-frequency optotype after switching. In this case, simply by switching the high-frequency optotype displayed on the optotype presenting means to a high-frequency optotype of a measurement mode different from the measurement mode of the currently displayed high-frequency optotype, the convergence angle is also switched in conjunction with the angle corresponding to the measurement mode. This makes it easier to properly perform an examination of the optical characteristics of the subject's eye using multiple measurement modes with simpler operations.

[0024] The control unit may cause each of the multiple high-frequency optotypes registered in the registration step to be displayed on the display unit in a distinguishable manner for each measurement mode. In this case, for example, the high-frequency optotypes registered for each measurement mode are clearly distinguished and displayed on the display unit, thereby preventing selection errors by the operator. Furthermore, even an inexperienced operator can easily select the high-frequency optotype to be used in the test for each measurement mode, leading to a smooth test.

[0025] Note that a specific method for displaying the high-frequency optotypes in a distinguishable manner for each measurement mode can be selected as appropriate. For example, the control unit may set multiple different display areas corresponding to multiple measurement modes and display each of the multiple high-frequency optotypes in a display area corresponding to the registered measurement mode among the multiple display areas. In this case, the operator can understand the measurement mode in which each high-frequency optotype is registered simply by understanding the display area in which each high-frequency optotype is displayed. Furthermore, the control unit may change the display mode of the high-frequency optotype (e.g., color or shape of a frame surrounding the high-frequency optotype) for each measurement mode, allowing the operator to understand the measurement mode in which each high-frequency optotype is registered.

[0026] The control unit may display each display area of ​​the high-frequency optotypes registered for each measurement mode in the registration step on the same screen of the display unit (e.g., monitor 11) so that they can be viewed simultaneously. In this case, the display unit may be configured, for example, as a single monitor. Alternatively, it may be configured, for example, as a plurality of monitors. In this way, by displaying each display area of ​​the high-frequency optotypes registered for each measurement mode on the display unit so that they can be viewed simultaneously, it becomes easier to view all of the high-frequency optotypes. Therefore, the operator can select high-frequency optotypes more efficiently.

[0027] The control unit may alternately display each display area of ​​the high-frequency optotype registered for each measurement mode in the registration step on the display unit in response to an instruction input by the operator. By displaying each display area of ​​the high-frequency optotype registered for each measurement mode on the display unit in a switchable manner, the high-frequency optotype corresponding to the measurement mode can be clearly distinguished, preventing the operator from making a selection error. For example, when the operator performs a measurement in the distance measurement mode, only the display area of ​​the high-frequency optotype for the distance measurement mode is displayed, preventing the erroneous selection of a high-frequency optotype for a measurement mode other than the distance measurement mode. Furthermore, since it is easy for even inexperienced operators to distinguish between the high-frequency optotypes corresponding to the measurement mode, the test can be performed smoothly.

[0028] After the display area of ​​the high-frequency optotypes displayed for each measurement mode is switched, if the operator designates one of the high-frequency optotypes displayed in the switched display area as the high-frequency optotype to be displayed by the optotype presenting means, the control unit may switch the measurement mode by receiving a signal designating one of the high-frequency optotypes displayed in the switched display area. The operator may also switch the display area of ​​the high-frequency optotypes displayed for each measurement mode simply to check the high-frequency optotypes registered for each measurement mode. In this case, if the measurement mode is switched every time the display area of ​​the high-frequency optotype is switched, delays in measurement time, etc., are likely to occur. In contrast, the control unit switches the measurement mode by receiving a signal designating a high-frequency optotype by the operator, thereby reducing the frequency of unnecessary switching of the measurement mode. This makes it easier to measure the optical characteristics of the subject's eye more smoothly.

[0029] However, the control unit can also switch the measurement mode each time the display area of ​​the high-frequency target is switched. In this case, the switching of the measurement mode starts before the high-frequency target to be displayed is specified by the operator. Therefore, for example, if the operator is familiar with the high-frequency target registered for each measurement mode, the measurement time may be shortened.

[0030] The multiple measurement modes may include a distance measurement mode, a near measurement mode in which the optotype presentation distance is shorter than that in the distance measurement mode, and an intermediate measurement mode in which the optotype presentation distance is shorter than that in the distance measurement mode and longer than that in the near measurement mode. In this case, by registering and displaying a high-frequency optotype for each of the multiple measurement modes, the operator can easily confirm the high-frequency optotype to be used at a predetermined optotype presentation distance. Therefore, the operator can smoothly perform tests at different predetermined optotype presentation distances.

[0031] However, the specific aspects of the multiple measurement modes can be changed. For example, two measurement modes, a distance measurement mode and a near measurement mode, may be provided. Also, four or more measurement modes may be provided.

[0032] When executing the registration step, the control unit may present, as test optotypes selectable by the operator, test optotypes that can be displayed on the optotype presenting means in a predetermined measurement mode, among a plurality of test optotypes that can be displayed on the optotype presenting means. For example, the test optotypes that can be displayed on the optotype presenting means include test optotypes that cannot be displayed in the distance measurement mode or in the near measurement mode. For example, when registering high-frequency optotypes for the distance measurement mode in the optotype registration means, the control unit may exclude test optotypes that cannot be displayed in the distance measurement mode and display only test optotypes that can be displayed in the distance measurement mode as options. Furthermore, for example, when registering high-frequency optotypes for the near measurement mode in the optotype registration means, the control unit may exclude test optotypes that cannot be displayed in the near measurement mode and display only test optotypes that can be displayed in the near measurement mode as options. This prevents registration errors, such as erroneously registering a test optotype that cannot be displayed as a high-frequency optotype when registering high-frequency optotypes for each measurement mode.

[0033] The present disclosure is not limited to the devices described in the present embodiment. For example, terminal control software (programs) that perform the functions of the above embodiments may be supplied to a device or system via a network or various storage media, and a control device (e.g., a CPU) of the device or system may read and execute the program.

[0034] <Example> An example of the subjective optometry device 100 according to this embodiment will be described. In this example, the subjective optometry device 100 is illustrated as being integrally provided with a display 31 that presents a test target to the subject's eye and an eye refractive power measurement unit 20 that changes the optical characteristics of the target light beam emitted from the display 31. Of course, for example, the display may be provided as a housing separate from the subjective optometry device.

[0035] <Device configuration> 1 is an external view of a subjective optometry apparatus 100. For example, the subjective optometry apparatus 100 includes a housing 1, a presentation window 2, a holding unit 3, an examiner controller 10, an eye refractive power measuring unit 20, and the like.

[0036] The housing 1 contains a light projection optical system 30 that projects a visual target light beam toward the subject's eye. The presentation window 2 transmits the visual target light beam projected by the light projection optical system 30. The visual target light beam is projected onto the subject's eye through the presentation window 2. When an eye refractive power measuring unit 20 is placed between the subject's eye and the presentation window 2 (see FIG. 1(b)), the visual target light beam is projected onto the subject's eye through the presentation window 2 and a test window 23 (see FIGS. 2 and 3), which will be described later. In this way, a test visual target is presented to the subject's eye.

[0037] The holding unit 3 holds the eye refraction measurement unit 20. For example, the holding unit 3 moves an arm by driving a drive unit (motor or the like) not shown, thereby moving the eye refraction measurement unit 20 connected to the arm. This allows the eye refraction measurement unit 20 to switch between a standby position (see FIG. 1(a)) and a measurement position (see FIG. 1(b)).

[0038] The examiner's controller 10 is used by an operator to operate the subjective ophthalmology device 100. The examiner's controller 10 includes a monitor 11, a switch unit 12, etc. Operation instructions for performing various settings (e.g., moving the eye refractive power measuring unit 20, etc.) are input to the switch unit 12. The monitor 11 displays various information (e.g., measurement results of the subject's eye E, etc.). The monitor 11 may also function as a touch panel that doubles as the switch unit 12. Signals from the examiner's controller 10 are output to the control unit 40 via wired or wireless communication.

[0039] <Projection optical system> FIG. 2 is a schematic diagram of the light projection optical system 30. FIG. 2(a) shows the optical arrangement during a distance test (distance measurement mode, which will be described later). FIG. 2(b) shows the optical arrangement during a near test (near measurement mode, which will be described later). The light projection optical system 30 projects a visual target light beam toward the subject's eye E. For example, the light projection optical system 30 includes a display 31, a plane mirror 32, a concave mirror 33, a near / far switching unit 34, a drive unit 35, and the like.

[0040] The display 31 displays a visual target (for example, a fixation target, a test visual target, etc.). A visual target light beam emitted from the display 31 forms an image on the fundus of the subject's eye E, thereby presenting the visual target to the subject's eye E. For example, the display 31 may be an LCD (Liquid Crystal Display), an organic EL (Electro Luminescence), a plasma display, or the like.

[0041] The plane mirror 32 reflects the visual target light beam from the display 31 and guides it to the concave mirror 33. The plane mirror 32 also reflects the visual target light beam from the display 31 and guides it to the subject's eye E. For example, the plane mirror 32 is positioned so that the distance (presentation distance) from the subject's eye E to the display 31 in the near vision measurement mode is optically approximately 40 cm. Note that the plane mirror 32 can be replaced with at least one of optical members such as a prism, a beam splitter, and a half mirror.

[0042] The concave mirror 33 reflects the visual target light beam from the display 31 and guides it to the plane mirror 32. For example, the concave mirror 33 is positioned so that in the distance measurement mode, the distance (presentation distance) from the subject's eye E to the display 31 is optically approximately 5 m. Note that, instead of the concave mirror 33, at least one of a reflective member such as an aspherical mirror or a free-form mirror may be used. Also, instead of or together with the concave mirror 33, a lens or the like may be used.

[0043] The far / near switching unit 34 switches the arrangement of the display 31 between a distance measurement mode and a near measurement mode. For example, the far / near switching unit 34 moves the holding unit by driving the driving unit 35, thereby moving the display 31 held by the holding unit. This allows the display 31 to be switched between a distance arrangement and a near arrangement.

[0044] For example, in the distance measurement mode, the display screen of the display 31 is directed toward the rear of the housing 1 (see FIG. 2(a)). The visual target light beam from the display 31 passes through the optical axis L1 and is incident on the plane mirror 32, and is reflected by the plane mirror 32 in the direction of the optical axis L2. The visual target light beam also passes through the optical axis L2 and is incident on the concave mirror 33, and is reflected by the concave mirror 33 in the direction of the optical axis L3. The visual target light beam also passes through the optical axis L3 and is incident on the plane mirror 32, and is reflected by the plane mirror 32 in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0045] For example, in the near vision measurement mode, the display screen of the display 31 is directed toward the top surface of the housing 1 (see FIG. 2(b)). The visual target light beam from the display 31 passes through the optical axis L3, enters the plane mirror 32, and is reflected by the plane mirror 32 in the direction of the optical axis L4. As a result, the visual target light beam that has passed through each optical member inside the housing 1 and is emitted to the outside of the housing 1 is projected onto the subject's eye E.

[0046] <Eye refractive power measurement unit (corrective optical system)> 3 is a schematic diagram of the eye refraction measurement unit 20. The eye refraction measurement unit 20 subjectively measures the refractive power of the subject's eye E. The eye refraction measurement unit 20 is also used as a corrective optical system. The corrective optical system is disposed in the optical path of the projection optical system 30, and changes the optical characteristics of the target light beam projected onto the subject's eye. For example, the eye refraction measurement unit 20 includes a forehead rest 21, a lens unit 22, an examination window 23, and a moving unit 24.

[0047] The forehead rest 21 abuts against the subject's head to fix the subject's eye E at a predetermined examination position and maintain a constant distance from the subject's eye E to the examination window 23. The lens unit 22 has a pair of left and right lens units 22L and 22R. The lens unit 22 has examination windows 23 (left examination window 23L and right examination window 23R).

[0048] The moving unit 24 adjusts the distance between the left lens unit 22L and the right lens unit 22R and the convergence angle (inward angle) between the left lens unit 22L and the right lens unit 22R. For example, the moving unit 24 adjusts the distance between the left lens unit 22L and the right lens unit 22R by driving a driving unit 25 (left driving unit 25L and right driving unit 25R). Also, for example, the moving unit 24 adjusts the convergence angle between the left lens unit 22L and the right lens unit 22R by driving a driving unit 26. For a detailed configuration of the moving unit 24, see, for example, Japanese Patent Application Laid-Open No. 2004-329345.

[0049] The lens unit 22 includes a lens disk 27 therein. The lens disk 27 has a left lens disk 27L arranged in the left lens unit 22L and a right lens disk 27R arranged in the right lens unit 22R. The lens disk 27 is rotated by driving of a driving unit (not shown). The lens disk 27 also arranges an aperture (or a 0D lens) and multiple optical elements 28 (left optical element 28L and right optical element 28R) on the same circumference. These optical elements are rotated by driving of a driving unit (not shown). As a result, the desired optical element 28 is switched and positioned in the inspection window 23 at the desired angle.

[0050] The lens disk 27 may consist of one lens disk or multiple lens disks. For example, the lens disk 27 may be provided with at least one of a spherical lens disk, a cylindrical lens disk, and an auxiliary lens disk. As an example, the spherical lens disk may have multiple spherical lenses with different spherical powers (spherical refractive powers). As another example, the cylindrical lens disk may have multiple cylindrical lenses with different cylindrical powers (cylindrical refractive powers). As another example, the auxiliary lens disk may have at least one of a shielding plate, a polarizing filter, a red filter / green filter, a dispersion prism, a Maddox lens, a rotary prism, a cross cylinder lens, an autocross cylinder lens, and an alignment lens.

[0051] The eye refraction measurement unit 20 may be any unit as long as it can change the optical characteristics of the visual target light beam. For example, the eye refraction measurement unit 20 may be configured to control an optical element as in this embodiment. Furthermore, for example, the eye refraction measurement unit 20 may change the optical characteristics of the visual target light beam by controlling a wavefront modulation element.

[0052] <Control unit> FIG. 4 is a schematic diagram of the control system of the subjective optometry device 100. For example, the control unit 40 includes a CPU (processor), RAM, ROM, etc. The CPU controls the driving of each unit in the subjective optometry device 100. Various types of information are temporarily stored in the RAM. Various programs executed by the CPU are stored in the ROM. The control unit 40 may be configured with multiple control units (i.e., multiple processors).

[0053] The control unit 40 is connected to the display 31, the examiner's controller 10, a nonvolatile memory 50 (hereinafter referred to as memory 50), etc. Also connected to the control unit 40 are a drive unit (not shown) of the holding unit 3, a drive unit 35 of the far / near switching unit 34, a drive unit (drive units 25, 26) of the eye refractive power measuring unit 20, a drive unit (not shown) of the lens disk 27, etc.

[0054] The memory 50 is a non-transitory storage medium that can retain its stored contents even if the power supply is cut off. For example, the memory 50 may be a hard disk drive, a flash ROM, a USB memory, or the like.

[0055] <Switching measurement modes> The subjective optometry device 100 according to this embodiment can switch between multiple measurement modes with different optotype presentation distances when measuring the optical characteristics of the subject's eye. For example, the subjective optometry device 100 according to this embodiment has a distance measurement mode in which the optotype presentation distance is a distance distance (e.g., 5 m) and a near measurement mode in which the optotype presentation distance is a near distance (e.g., 40 cm). The subjective optometry device 100 may also have an intermediate measurement mode in which the optotype presentation distance is an intermediate distance (e.g., 1 m between the distance and near distances). The subjective optometry device 100 may also have a measurement mode in which the optotype presentation distance is set farther than the distance distance or closer than the near distance. Furthermore, the subjective optometry device 100 may have multiple measurement modes corresponding to arbitrary optotype presentation distances. The following describes the settings of the subjective optometry device 100 in the distance measurement mode and the near measurement mode.

[0056] Fig. 5 shows an example of the operation screen 200 of the examiner's controller 10. Fig. 5(a) shows the operation screen for the distance measurement mode. Fig. 5(b) shows an example of the operation screen for the near measurement mode. For example, the operation screen 200 includes a measurement mode display section 201, a test result display section 202 (202a, 202b), an auxiliary operation selection area 211, a target selection area 212, a display area 221 for the distance high-frequency target, and a display area 223 for the near high-frequency target.

[0057] The measurement mode display unit 201 indicates the current measurement mode. The measurement mode display unit 201 may also serve as a measurement mode switching unit (e.g., a button) for switching between a distance measurement mode and a near measurement mode. The control unit 40 may switch to a measurement mode different from the current measurement mode based on an operation signal from the operator selecting the measurement mode display unit 201. The test result display unit 202 displays the test items for each measurement mode and the test results of a subjective test performed with the subjective optometry device 100. For example, the test result display unit 202 may display values ​​related to the optical characteristics of the target luminous flux for each type of optical characteristic. For example, the test result display unit 202a (see FIG. 5(a)) in the distance measurement mode displays the prescribed add power (ADD) 203, but the test result display unit 202b (see FIG. 5(b)) in the near measurement mode does not display the prescribed add power (ADD). The auxiliary operation selection area 211 displays icons operated by the operator to perform operations to assist in the display of the test optotypes (hereinafter referred to as display auxiliary operations). Examples of display auxiliary operations include switching the presence or absence of auxiliary lenses, inverting the black and white of the test optotypes, and turning on the glare lamp. The optotype selection area 212 displays icons of test optotypes that can be displayed by the subjective optometry device 100. For example, the test optotype icons may include at least one of the Landolt ring optotype, the Tumbling E optotype, the Hiragana optotype, the Katakana optotype, the alphabet optotype, and the numeric optotype. The display area 221 of the distance high-frequency optotype is an area used to register a high-frequency optotype to be used in the distance measurement mode. The display area 223 of the near high-frequency optotype is an area used to register a high-frequency optotype to be used in the near measurement mode.

[0058] An example of the control operation of the subjective optometry device when executing the distance measurement mode will be described. For example, when a trigger to execute the distance measurement mode is input to the examiner's controller 10, the control unit 40 drives the drive units 25 and 26 to adjust the distance and convergence angle between the left lens unit 22L and the right lens unit 22R to the distance test position. Furthermore, for example, the control unit 40 drives the drive unit 35 to position the display 31 at a position where the visual target presentation distance is optically 5 m. Furthermore, for example, the control unit 40 displays the spherical prescription value (S), cylindrical prescription value (C), astigmatism axis prescription value (A), and prescription add power (ADD) as test items for the distance test on the test result display unit 202a of the operation screen 200. The control unit 40 also displays the measurement mode currently being executed (here, "distance") on the measurement mode display unit 201.

[0059] Next, an example of the control operation of the subjective ophthalmology device when executing the near vision measurement mode will be described. For example, when a trigger to execute the near vision measurement mode is input to the examiner's controller 10, the control unit 40 drives the drive units 25 and 26 to adjust the distance and convergence angle between the left lens unit 22L and the right lens unit 22R to the position for the near vision test. Furthermore, for example, the control unit 40 drives the drive unit 35 to position the display 31 at a position where the presentation distance of the optotype is optically 40 cm. Furthermore, for example, the control unit 40 displays the spherical prescription value (S), cylindrical prescription value (C), and astigmatic axis prescription value (A) as test items for the near vision test on the test result display unit 202b of the operation screen 200. The control unit 40 also displays the measurement mode currently being executed (here, "near vision") on the measurement mode display unit 201.

[0060] <Control action> The control operation in the embodiment of the subjective optometry apparatus having the above-described configuration will be described below.

[0061] <Registration of high-frequency targets> The subjective optometry device 100 in this embodiment can register, in the memory 50, a plurality of high-frequency optotypes, which are test optotypes that are used more frequently than other test optotypes, among a plurality of test optotypes that can be displayed on the display 31. A method for registering high-frequency optotypes will be described below.

[0062] FIG. 6( a) shows an example of an operation screen 200 for registering a high-frequency optotype for distance vision. The operator can register multiple high-frequency optotypes using the operation screen 200 displayed on the monitor 11 of the examiner controller 10. For example, when registering a high-frequency optotype for distance vision, the operator selects the edit button 222 for the high-frequency optotype for distance vision. For example, the control unit 40 switches the display state of the display area 221 for the high-frequency optotype for distance vision to an edit mode display state in which the high-frequency optotype can be edited, based on the operation signal of the edit button 222. At the same time, the control unit 40 displays only icons of test optotypes that can be displayed in the distance measurement mode, among the multiple test optotypes that can be displayed on the display 31, as icons of test optotypes that can be selected by the operator. As an example, in this embodiment, the control unit 40 displays check boxes indicating that the test optotype is selectable only for test optotype icons that can be displayed in the distance measurement mode, among the test optotype icons displayed in the optotype selection area 212. 6(a), a check box may not be displayed for a test optotype that cannot be displayed in the distance measurement mode, and the test optotype may be set so that the test optotype cannot be selected (registered) as a high-frequency optotype for distance. This makes it possible to prevent registration errors such as erroneously registering a test optotype that cannot be displayed as a high-frequency optotype when registering high-frequency optotypes for each measurement mode.

[0063] For example, the operator selects an icon of a test optotype to be registered as a high-frequency optotype for distance use from among the test optotype icons displayed in the optotype selection area 212 by using a checkbox (see FIG. 6(a)), and registers the icon in the high-frequency optotype display area 221 for distance use by various operation methods such as drag and drop. When registering the icons of the test optotype in the high-frequency optotype display area 221 for distance use, the icons may be registered one by one, or multiple icons may be registered at once. In addition, the icons of the test optotypes to be registered in the high-frequency optotype display area 221 for distance use may be registered in any arrangement, such as order or row. In addition, the icons to be registered in the high-frequency optotype display area 221 for distance use may include a display auxiliary operation icon displayed in the auxiliary operation selection area 211.

[0064] 6(b) is an example of the operation screen 200 after the registration of multiple distance high-frequency targets has been completed. For example, the operator registers icons 240 to be registered as distance high-frequency targets in the distance high-frequency target display area 221 in the order in which they will be used in the distance test, and then presses the edit button 222 again. For example, the control unit 40 ends the edit mode based on the operation signal of the edit button 222. The control unit 40 also registers data indicating the multiple distance high-frequency targets registered in the distance high-frequency target display area 221 as registration data of the distance high-frequency targets (stored in the memory 50 in this embodiment). As a result, the multiple registered distance high-frequency targets are displayed as icons in the distance high-frequency target display area 221.

[0065] Similarly, the operator can register a high-frequency optotype for near vision. For example, the operator designates the edit button 224 for the high-frequency optotype for near vision. For example, the control unit 40 switches the display state of the display area 223 for the high-frequency optotype for near vision to an edit mode display state in which the high-frequency optotype can be edited, based on an operation signal from the edit button 224. At the same time, the control unit 40 displays only icons of test optotypes that can be displayed in the near vision measurement mode, among the multiple test optotypes that can be displayed on the display 31, as icons of test optotypes that can be selected by the operator. As an example, in this embodiment, the control unit 40 displays check boxes indicating that the test optotype is selectable, only for test optotype icons that can be displayed in the near vision measurement mode, among the test optotype icons displayed in the optotype selection area 212. Then, for example, the operator selects an icon of a test optotype to be registered as a near high-frequency optotype from among the test optotype icons displayed in the optotype selection area 212 by using a checkbox, and registers the icon in the near high-frequency optotype display area 223 in the order of use in the near test by various operating techniques such as drag and drop. After that, for example, the operator presses the edit button 224 again. For example, the control unit 40 ends the edit mode based on the operation signal of the edit button 224. The control unit 40 also stores data indicating the multiple near high-frequency optotypes registered in the near high-frequency optotype display area 223 in the memory 50 as registration data of the near high-frequency optotype. As a result, the multiple registered near high-frequency optotypes are displayed as icons in the near high-frequency optotype display area 223.

[0066] In this way, by registering multiple high-frequency optotypes for each measurement mode in the optotype registration means, the user (e.g., operator) can reduce the time and effort required to search for and display the desired test optotype for each measurement mode. Therefore, the operator can easily select the high-frequency optotype according to the measurement mode. Furthermore, by being able to register the high-frequency optotype according to the measurement mode, even an inexperienced operator can easily distinguish the test optotype to be used for each measurement mode, allowing the test to be performed smoothly.

[0067] <Distance test> The flow of the test in the distance test mode in this embodiment will be described. The operator, for example, operates the examiner's controller 10 to input an instruction to execute the distance measurement mode. For example, when an instruction to execute the distance measurement mode is input, the control unit 40 switches the display 31 to the distance position as shown in FIG. 2(a), and sets the spacing and convergence angle of the lens units 22 to the distance position. Furthermore, for example, the control unit 40 displays the operation screen 200 shown in FIG. 5(a).

[0068] Next, the operator operates a forehead support adjustment knob (not shown) to adjust the position of the forehead support 21 so that the corneal vertex distance VD of the subject's eye E becomes a predetermined distance (e.g., 12 mm). The operator also operates the examiner's controller 10 to input the interpupillary distance of the subject's eye. The control unit 40 adjusts the distance between the pair of lens units 22 to align the examination window 23 with the interpupillary distance (see FIG. 3).

[0069] The operator may operate the examiner controller 10 to input the objective ocular refractive power (objective value) previously acquired by objective measurement of the subject's eye E as the initial correction amount of the subject's eye E. For example, the initial spherical correction amount, the initial cylindrical correction amount, and the initial astigmatic axis correction amount may be input as the initial correction amount. The control unit 40 controls the lens disk 27 and the optical element 28 included in the lens disk 27 based on the initial correction amount. As a result, the ocular refractive power of the subject's eye E is corrected to 0D (i.e., so that the target light beam from the display 31 is focused on the retina of the subject's eye E).

[0070] When the optical characteristics of the target light beam emitted to the subject's eye E are corrected by the initial correction amount, the operator starts a distance test for the subject's eye E. For example, the operator designates an icon of a Landolt ring target having a predetermined visual acuity value in the distance high-frequency target display area 221. The control unit 40 causes the display 31 to display the designated Landolt ring target based on the operation signal.

[0071] The operator operates the examiner controller 10 to switch between Landolt ring targets and ask the examinee which direction the gap in the ring of the Landolt ring target is. For example, if the examinee's answer is correct, the operator switches the visual acuity value of the Landolt ring target to a visual acuity value one level higher. That is, the operator increases the visual acuity value of the Landolt ring target by one increment, switching it to a value larger than the current value. For example, if the examinee's answer is incorrect, the operator switches the visual acuity value of the Landolt ring target to a visual acuity value one level lower. That is, the operator decreases the visual acuity value of the Landolt ring target by one increment, switching it to a value smaller than the current value. The operator repeats these procedures to determine the highest visual acuity value of the Landolt ring target that the examinee's eye E can read.

[0072] Next, the operator operates the examiner controller 10 to ask the subject the direction of the gap in the ring of the Landolt ring while changing the correction amount of the optical characteristics of the target light beam emitted to the subject's eye E. For example, if the subject's answer is correct, the operator changes the amount of spherical correction to a correction amount that is one step weaker. That is, the operator decreases the amount of spherical correction by one step and changes it to a value smaller than the current value. For example, if the subject's answer is incorrect, the operator changes the amount of spherical correction to a correction amount that is one step stronger. That is, the operator increases the amount of spherical correction by one step and changes it to a value larger than the current value. The operator repeats these procedures to determine the best visual acuity value of the Landolt ring that the subject's eye E can read. Furthermore, the operator switches to a plurality of other test targets and repeats the procedure of adjusting the correction amount in the same way, to find the optimum correction values ​​for the subject's eye E in the distance test for the prescription value of the spherical correction amount, the prescription value of the cylindrical correction amount, the prescription value of the astigmatism axis correction amount, the prescription value of the addition power, etc. With this, the operator completes the distance test.

[0073] At this time, when switching test optotypes in a series of distance tests, for example, the operator operates the examiner's controller 10 to specify the icon of the next test optotype from the distance high-frequency optotype display area 221, in which test optotypes are registered in the order of use in the distance test. Based on the operation signal, the control unit 40 switches the test optotype to be displayed on the display 31 to the specified test optotype. By repeating these procedures, the operator can smoothly switch and display the test optotypes to be used in the distance test. This appropriately reduces the time and effort required to search for and display the desired test optotype from the optotype selection area 212 each time.

[0074] <Near vision test> The flow of testing in the near vision test mode in this embodiment will be described. The following description will be given taking as an example a case where a near vision test is performed after a distance test for the subject's eye E has been completed. In this embodiment, when the high-frequency optotype displayed on the display 31 can be switched to a high-frequency optotype of another measurement mode (e.g., a near vision measurement mode) different from the measurement mode (e.g., a distance test mode) for the currently displayed high-frequency optotype, the control unit 40 switches the high-frequency optotype and also switches the measurement mode. For example, the operator operates the examiner controller 10 to specify an icon representing a Landolt ring optotype having a predetermined visual acuity value as an arbitrary near-vision high-frequency optotype from the near-vision high-frequency optotype display area 223. The control unit 40 switches the test optotype displayed on the display 31 at the end of the distance test mode to the Landolt ring optotype, which is the near-vision high-frequency optotype specified by the operator, and displays it on the display 31. At the same time, the control unit 40 switches the display 31 to the near-display position and sets the spacing and convergence angle of the lens units 22 to the near-display position, as shown in Fig. 2(b). The control unit 40 also displays the operation screen 200 shown in Fig. 5(b). As a result, the measurement mode is switched from the far-display measurement mode to the near-display measurement mode.

[0075] The operator operates the examiner controller 10 to switch between Landolt ring targets and ask the examinee which direction the gap in the ring of the Landolt ring target is. For example, if the examinee's answer is correct, the operator switches the visual acuity value of the Landolt ring target to a visual acuity value one level higher. Also, for example, if the examinee's answer is incorrect, the operator switches the visual acuity value of the Landolt ring target to a visual acuity value one level lower. The operator repeats these procedures to determine the highest visual acuity value of the Landolt ring target that the examinee's eye E can read.

[0076] Next, the operator operates the examiner controller 10 to ask the subject about the direction of the gap in the ring of the Landolt ring test target while changing the correction amount of the optical characteristics of the target light beam emitted to the subject's eye E. For example, if the subject's answer is correct, the operator changes the spherical correction amount to a correction amount that is one level weaker. Also, for example, if the subject's answer is incorrect, the operator changes the spherical correction amount to a correction amount that is one level stronger. The operator repeats these procedures to determine the highest visual acuity value of the Landolt ring test target that the subject's eye E can read. Furthermore, the operator switches to multiple other test targets and repeats the procedure of adjusting the correction amount in the same way to determine the optimal correction value for the subject's eye E in the near vision test for at least one of the prescribed spherical correction amount, cylindrical correction amount, and astigmatism axis correction amount. This completes the near vision test.

[0077] At this time, when switching test optotypes in a series of near vision tests, for example, the operator operates the examiner's controller 10 to specify the icon of the next test optotype from the near vision high frequency optotype display area 223 in which test optotypes are registered in the order of use in the near vision test. Based on the operation signal, the control unit 40 switches the test optotype to be displayed on the display 31 to the specified test optotype. By repeating these procedures, the operator can smoothly switch and display the test optotypes to be used in the near vision test.

[0078] By registering the measurement mode and the high-frequency optotype in association with each other in this manner, the operator can easily switch the device to a measurement mode corresponding to the optotype presentation distance and display the desired test optotype simply by selecting a high-frequency optotype from the registered high-frequency optotypes for each measurement mode. In conventional subjective optometry devices, when performing an examination at different optotype presentation distances, the operator must not only switch the measurement mode but also select the desired test optotype, which makes the operation complicated and time-consuming. In contrast, in this embodiment, the measurement mode and the high-frequency optotype are registered in association with each other. Furthermore, when switching the high-frequency optotype displayed on the display 31 to a high-frequency optotype of a measurement mode different from the measurement mode of the currently displayed high-frequency optotype, the control unit 40 also switches the measurement mode. As a result, the operator's operational efficiency during the examination is appropriately improved.

[0079] <Example of transformation> In this embodiment, a configuration including a distance measurement mode and a near measurement mode has been described as an example of the multiple measurement modes with different optotype presentation distances provided in the subjective optometry device 100. However, this is not limiting. For example, the multiple measurement modes may include an intermediate measurement mode in which the optotype presentation distance is set to an arbitrary intermediate distance (e.g., 1 m) between the distance and near distances. Furthermore, the subjective optometry device 100 may have three or more measurement modes corresponding to arbitrary optotype presentation distances, such as a second intermediate measurement mode in which the optotype presentation distance is set to an intermediate distance (e.g., 80 cm) different from the above. The following description will be given of a subjective optometry device 100 that includes a distance measurement mode, a near measurement mode, and an intermediate measurement mode in which the optotype presentation distance is an intermediate distance (e.g., 1 m).

[0080] An example of the control operation of the subjective optometry device when the intermediate vision measurement mode is executed will be described. For example, when an instruction to execute the intermediate vision measurement mode is input by operating the examiner's controller 10, the control unit 40 drives the drive units 25 and 26 to adjust the distance and convergence angle between the left lens unit 22L and the right lens unit 22R to a position that aligns the viewpoint of the subject's eye E with the optotype presentation distance of approximately 1 m. Furthermore, for example, the control unit 40 drives the drive unit 35 to position the display 31 in the near vision position shown in FIG. 2(b). Then, the control unit 40 drives the drive unit (not shown) in the lens disk 27 to switch and position an optical element 28 (e.g., a spherical lens or a prism) with a power that sets the optotype presentation distance to approximately 1 m in the test window 23. At this time, for example, the combination of optical elements 28 required to set an arbitrary optotype presentation distance may be pre-stored in the control unit 40.

[0081] For example, the operator can register a high-frequency target for intermediate use by associating the above-described intermediate measurement mode with a high-frequency target.

[0082] Fig. 7 is an example of an operation screen 300 including a display area for a high-frequency optotype for far vision, a display area for a high-frequency optotype for intermediate vision, and a display area for a high-frequency optotype for near vision, etc. The operation screen 300 illustrated in Fig. 7 includes an auxiliary operation selection area 211, an optotype selection area 212, a high-frequency optotype display area 221 for far vision, a high-frequency optotype display area 223 for near vision, a high-frequency optotype display area 225 for intermediate vision, an edit button 226, etc.

[0083] For example, the operator selects the edit button 226 for the intermediate high-frequency optotype. For example, the control unit 40 switches the display state of the display area 225 for intermediate high-frequency optotypes to an edit mode display state in which high-frequency optotypes can be edited, based on an operation signal from the edit button 226. At the same time, the control unit 40 displays only the icons of test optotypes that can be displayed in the intermediate measurement mode, among the multiple test optotypes that can be displayed on the display 31, as icons of test optotypes that can be selected by the operator. As an example, in this embodiment, the control unit 40 displays check boxes indicating that only the test optotype icons that can be displayed in the intermediate measurement mode, among the test optotype icons displayed in the optotype selection area 212, are selectable test optotypes. Then, for example, the operator selects the icon of the test optotype that he or she wants to register as the intermediate high-frequency optotype from the test optotype icons displayed in the optotype selection area 212 using the checkbox, and registers it in the intermediate high-frequency optotype display area 225 by various operation methods, such as drag and drop. After that, for example, the operator presses the edit button 226 again. For example, the control unit 40 ends the edit mode based on an operation signal from the edit button 226. Furthermore, the control unit 40 stores data indicating the plurality of intermediate-use high-frequency optotypes registered in the intermediate-use high-frequency optotype display area 225 in the memory 50 as registered data of the intermediate-use high-frequency optotypes. As a result, the plurality of registered intermediate-use high-frequency optotypes are displayed as icons in the intermediate-use high-frequency optotype display area 225.

[0084] In this case, the operator can easily check the high-frequency optotype to be used at a predetermined optotype presentation distance by registering and displaying the high-frequency optotype for each of the distance measurement mode, near measurement mode, and other measurement modes for any optotype presentation distance (for example, intermediate measurement mode). Therefore, the operator can smoothly perform tests at different predetermined optotype presentation distances.

[0085] In this embodiment, the display areas of the high-frequency optotypes registered for each measurement mode are displayed on the same display unit, but this is not limiting. For example, the control unit 40 may switch between the display areas of the high-frequency optotypes registered for each measurement mode on the display unit in response to instructions input by the operator. As an example, the display areas of the high-frequency optotypes registered for each measurement mode may be displayed on different tabbed pages on the display unit. In this case, for example, the display areas of the high-frequency optotypes registered for each measurement mode are switched between by the operator switching between tabs.

[0086] 8 is an example of a display unit (e.g., operation screen 310) arranged to switch between a display area for a high-frequency target for distance use and a display area for a high-frequency target for near use. The operation screen 310 includes a high-frequency target for distance use display area 221 and a high-frequency target for near use display area 223. As shown in FIG. 8, the high-frequency target for distance use display area 221 and the high-frequency target for near use display area 223 can be switched between by the operator switching tabs.

[0087] By switching between the display areas of the high-frequency optotypes registered for each measurement mode and displaying them on the display unit, the high-frequency optotypes corresponding to the measurement mode can be clearly distinguished, preventing the operator from making a selection error. For example, when the operator performs a measurement in the distance measurement mode, only the display area of ​​the high-frequency optotype for the distance measurement mode is displayed, so that the high-frequency optotype for a measurement mode other than the distance measurement mode is not mistakenly selected. Furthermore, even an inexperienced operator can easily distinguish the high-frequency optotypes corresponding to the measurement mode, allowing for a smooth examination.

[0088] Furthermore, when the display unit is configured to switch between display areas of high-frequency targets registered for each measurement mode, the control unit 40 may switch the measurement mode when the operator actually selects one of the high-frequency targets displayed in the switched display area, rather than when the display area of ​​the high-frequency targets is switched. This reduces the frequency of unnecessary switching of the measurement mode against the operator's intention, such as when the operator switches the display area simply to check the high-frequency target for each measurement mode. Furthermore, unnecessary switching of the measurement mode is less likely to cause adverse effects, such as delays in the examination time. [Explanation of symbols]

[0089] 1 chassis 2 Presentation window 3 Holding Unit 10 Examiner controller 20 Eye Refractive Power Measurement Unit 30 Projection optical system 31 Display 40 Control Unit 50 memory 100 Subjective optometry device 200 Operation screen

Claims

1. A subjective optometry device for subjectively measuring optical characteristics of a subject's eye, optotype presenting means for presenting a test optotype to the subject's eye; a distance changing means for optically changing the optotype presentation distance of the test optotype; optotype registration means for registering a high-frequency optotype, which is a test optotype that is used more frequently than other test optotypes, among the plurality of test optotypes that can be displayed on the optotype presenting means; A control unit; and At least, a plurality of measurement modes in which the optotype presentation distance is different from each other when measuring the optical characteristics of the subject's eye can be switched, The control unit a registration step of registering a plurality of the high-frequency targets in the target registration means for each of the measurement modes; a high-frequency target switching step of switching a high-frequency target to be displayed on the target presenting means among the plurality of high-frequency targets registered in the target registration means for each measurement mode in the registration step in accordance with an instruction input by an operator; a measurement mode switching step of switching the measurement mode by controlling at least the driving of the distance changing means to change the optotype presentation distance corresponding to the measurement mode of the high-frequency optotype before switching to the optotype presentation distance corresponding to the measurement mode of the high-frequency optotype after switching when the high-frequency optotype to be displayed on the optotype presenting means is switched to a high-frequency optotype of another measurement mode different from the measurement mode of the high-frequency optotype being displayed; A subjective optometry device characterized by performing the above.

2. The subjective ophthalmological examination device according to claim 1, Further provided is a correction means for changing the optical characteristics of the target light beam emitted from the target presenting means, the correcting means includes a convergence angle changing means for changing the convergence angle between a visual target light beam emitted to the right eye of the subject and a visual target light beam emitted to the left eye of the subject, In the measurement mode switching step, the control unit A subjective ophthalmological examination device characterized in that, when the high-frequency optotype to be displayed by the optotype presenting means is switched to a high-frequency optotype of another measurement mode different from the measurement mode of the high-frequency optotype currently being displayed, the measurement mode is switched by controlling the drive of the convergence angle changing means to change the convergence angle from the convergence angle corresponding to the measurement mode of the high-frequency optotype before switching to the convergence angle corresponding to the measurement mode of the high-frequency optotype after switching.

3. 3. The subjective ophthalmological examination device according to claim 1, The subjective optometry device is characterized in that the control unit causes each of the plurality of high-frequency optotypes registered in the registration step to be displayed on a display unit so as to be distinguishable for each measurement mode.

4. The subjective optometry device according to claim 3, the control unit causes the display unit to display each display area of ​​the high-frequency target registered for each measurement mode in the registration step so that the display areas can be simultaneously viewed.

5. 4. The subjective ophthalmological examination device according to claim 3, The control unit switches between and displays each display area of ​​the high-frequency target registered for each measurement mode in the registration step on the display unit in accordance with an instruction input by an operator.

6. 6. The subjective ophthalmological examination device according to claim 5, A subjective ophthalmological examination device characterized in that, after the display area of ​​the high-frequency optotypes displayed for each measurement mode is switched, when an operator designates any of the high-frequency optotypes displayed in the switched display area as the high-frequency optotype to be displayed by the optotype presenting means, the control unit switches the measurement mode when the designation of any of the high-frequency optotypes displayed in the switched display area is completed.

7. 7. The subjective ophthalmological examination device according to claim 1, The subjective ophthalmological examination device is characterized in that the plurality of measurement modes include a distance measurement mode, a near measurement mode in which the optotype presentation distance is shorter than that in the distance measurement mode, and an intermediate measurement mode in which the optotype presentation distance is shorter than that in the distance measurement mode and longer than that in the near measurement mode.

8. 8. The subjective ophthalmological examination device according to claim 1, The subjective eye examination device is characterized in that, when executing the registration step, the control unit displays, as a test optotype selectable by the operator, a test optotype that can be displayed on the optotype presenting means in a predetermined measurement mode, out of a plurality of test optotypes that can be displayed on the optotype presenting means.

9. A subjective optometry program executed in a subjective optometry device that subjectively measures optical characteristics of a subject's eye, The subjective ophthalmological examination device is optotype presenting means for presenting a test optotype to the subject's eye; a distance changing means for optically changing the optotype presentation distance of the test optotype; optotype registration means for registering a high-frequency optotype, which is a test optotype that is used more frequently than other test optotypes, among the plurality of test optotypes that can be displayed on the optotype presenting means; A control unit; and The subjective optometry program is executed by the control unit of the subjective optometry device, a registration step of registering a plurality of the high-frequency targets in the target registration means for each of the measurement modes; a high-frequency target switching step of switching a high-frequency target to be displayed on the target presenting means among the plurality of high-frequency targets registered in the target registration means for each measurement mode in the registration step in accordance with an instruction input by an operator; a measurement mode switching step of switching the measurement mode by controlling at least the driving of the distance changing means to change the optotype presentation distance corresponding to the measurement mode of the high-frequency optotype before switching to the optotype presentation distance corresponding to the measurement mode of the high-frequency optotype after switching when the high-frequency optotype to be displayed on the optotype presenting means is switched to a high-frequency optotype of another measurement mode different from the measurement mode of the high-frequency optotype being displayed; A subjective optometry program that causes the subjective optometry device to execute the above.

Images