JP2012165806A - Optometry system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optometry system which has a small number of parts and can control lighting-up of an extra-screen lamp attached on a visual target.SOLUTION: The system includes a configuration in which if a mode detecting image signal of an optometry mode requiring the lighting-up of the extra-screen lamp (such as a fixation lamp 200 or a glare lamp) is included in the image signal, a main control circuit 314 turns on the extra-screen lamp (such as the fixation lamp 200 or the glare lamp).

Description

  The present invention relates to an optometry system that inspects visual acuity, visual function, etc. by displaying a target for optometry on a target indicator.

  As a conventional optometry system, Landolt rings, letters, numbers, and other charts are displayed on the display unit of the target presentation device, and the charts displayed on the display unit are displayed via the left and right optometry windows of the subjective optometry device. A system is known in which an optometric optical member is operated by operating an optical member for optometry that is viewed by a controller and exposed to an optometry window of a subjective optometry apparatus (for example, a patent) Reference 1).

  As an inspection using this optometry system, an oblique inspection using a line light by a Maddox rod as in Patent Document 1 is known.

  In this oblique examination, a chart in which a white dot point target is arranged at the center of a black background (background) is displayed on the display unit of the target presentation device, and one of the left and right optometry windows of the subjective optometry device is displayed. When the Madox Rod lens is faced to the left and right test eyes and the pointed target on the display unit of the target display device is viewed, the vertical (vertical) or horizontal (horizontal) Maddox rod is used for one of the test eyes. The line light is visually recognized and a point-like visual target is visually recognized on the other eye to be examined.

  If the left and right eyes of the subject do not have an oblique position, the subject can visually recognize the line light by the Maddox rod and the point target. However, if the left and right eyes of the subject are oblique, the subject can visually recognize the line light and the point-like target by the Madox rod gavel shifted left and right or up and down.

  In such an optometry system, a liquid crystal display, a CRT, or the like is used as a target presentation device. In such a target presentation device, since the amount of light of the point target displayed on the display unit is small and the point target is small, it is difficult to visually recognize the line light from the point target or Maddox rod. For this reason, normally, the oblique inspection by the line light by a Madox rod is performed in the dark room which is not influenced by external light.

  Since installation in a very dark room is difficult, the fixation target such as an LED is provided on the target presentation device without displaying the point target on the display unit of the target presentation device. It is considered that a sufficient amount of light can be obtained by substituting a linear target. In the oblique inspection using the fixation lamp, the entire display unit of the target presentation device is displayed as a black image.

  In addition, as a target presentation device of an optometry system, a device in which a glare lamp 500 such as an LED is arranged around a target display screen (target display unit) to perform a glare test is known (for example, , See Patent Document 2). In this glare test, the appearance of the target on the target display screen is inspected by visually recognizing the target displayed on the target display screen while the glare lamp 500 is turned on.

JP 2008-272101A JP-A-5-137694

  By the way, at the time of oblique inspection using the line light by the Maddox rod, an image cable for sending an image signal for displaying the entire display unit as a black image to the target presentation device and a signal for turning on / off the fixation lamp are sent. It is provided separately from the communication means. For example, this communication means usually uses infrared light, radio waves or a dedicated communication cable different from the image cable.

  Further, in an optometry system capable of performing a glare test, it is common to separately provide communication means and an image cable for turning on and off an off-screen lamp such as a fixation lamp or a glare lamp 500.

  However, when infrared light, radio waves, or a dedicated communication cable other than the image cable is provided as described above, there is a problem that the number of parts increases, the labor for managing parts increases, and the cost increases.

  Therefore, an object of the present invention is to provide an optometry system that can perform lighting control of a lamp outside the display screen provided in a visual target indicator with a small number of parts.

  To achieve this object, the present invention selects a target image provided with a display body that displays a target image on a display unit that is a display screen, and a target image to be displayed on the display. Selection means, an off-screen lamp provided outside the display screen of the target indicator and used for examining the eye to be examined, and an image signal of the selected target image are input to the target indicator. Main control means for displaying a visual target image based on the image signal on the display screen, wherein the main control means is for mode detection of an optometry mode that requires lighting of the off-screen lamp. When the image signal is included in the image signal, the optometry system is characterized in that the off-screen lamp is turned on.

  According to this configuration, it is possible to perform lighting control of the display screen lamp provided in the visual target indicator with a small number of parts.

It is a perspective view which shows the use condition of the subjective optometry apparatus which concerns on this invention. FIG. 2 is an enlarged explanatory view of the subjective optometry apparatus of FIG. 1. It is explanatory drawing of a rotation desk. It is explanatory drawing of another rotation desk. It is explanatory drawing explaining the connection of the main control apparatus shown in FIG. 1, and another apparatus. It is explanatory drawing of the plug and play of the optotype indicator shown in FIG. It is explanatory drawing of contrast information acquisition by the individual difference of the optotype display shown in FIG. It is a control circuit diagram of the optometry system of FIG. It is explanatory drawing of the memory of the optotype display control circuit of FIG. It is explanatory drawing which showed an example of the screen displayed on a display part. (A) is an explanatory diagram when the chart of the oblique inspection by the Madox rod and the horizontal Madox rod lens schematic diagram are displayed on the display unit of the controller, and (b) is an oblique inspection based on the display of (a). It is explanatory drawing of the optotype visually recognized by the subject at times. (A) is an explanatory diagram when the chart of the oblique inspection by the Maddox rod and the vertical Maddox rod lens schematic diagram are displayed on the display unit of the controller, and (b) is an oblique inspection based on the display of (a). It is explanatory drawing of the optotype visually recognized by the subject at times. It is explanatory drawing of a target indicator provided with a glare lamp. It is explanatory drawing of a control circuit provided with the drive circuit of the glare lamp of FIG.

  Hereinafter, an example of an optometry system according to an embodiment of the present invention will be described with reference to the drawings.

  The optometry system shown in FIGS. 1 and 5 includes a main control device (control device main body) 1, a target presentation (presentation) device 2, a controller 3, and a subjective optometry device 4 (see FIG. 2).

  Further, in FIG. 1, 5 is an optometry table, 6 is a support provided on the side of the optometry table 5, and 7 is a support arm attached to the support 6.

  The optotype presenting apparatus 2 includes an optotype indicator 2a and a support 2b that supports the optotype indicator 2a. A liquid crystal display (liquid crystal display) is used as the target indicator 2a. Moreover, the visual target indicator 2a includes a rectangular case 2c having a rectangular frame portion 2c2 at the periphery of the front opening 2c1, and a panel-like display body (liquid crystal display body) 2d incorporated in the case 2c. . And the display part (liquid crystal display part, display screen) 2d1 of the display body 2d faces the front opening 2c1. Further, a fixation lamp 200 used for oblique inspection or the like is attached to the upper side portion Cus of the rectangular frame portion 2c2 as an off-screen lamp so as to correspond to the center in the left-right direction of the display portion 2d1.

The column 6 is attached to the optometry table 5 so as to be extendable in the vertical direction, and the support arm 7 is provided on the column 6 so as to be horizontally rotatable.
[Subjective optometry device 4]
As shown in FIG. 2, the subjective optometry apparatus 4 includes a support member 8 fixed to a horizontal portion 7a in the middle in the longitudinal direction of the support arm 7, a unit support 9 disposed on the lower side of the support member 8, A measurement head (optometry apparatus main body) 4a is provided below the unit support 9. The measurement head 4a includes symmetrical optometry units 10L and 10R.

  The optometry units 10L and 10R can be relatively moved toward and away from each other, so that the distance between the optical axes of the optometry windows Lw and Rw of the optometry units 10L and 10R can be adjusted to the interpupillary distance of the subject 22. It can be done.

  The subject 22 in FIG. 1 performs various examinations by looking at the target chart presented on the display unit (target display unit) 2d1 of the target presentation apparatus 2 through the optometry windows Lw and Rw of the optometry units 10L and 10R. To receive. Various optical elements (optical members) are arranged in the optometry windows Lw and Rw of the optometry units 10L and 10R, so that various tests can be performed.

  Since the optometry units 10L and 10R have a bilaterally symmetric structure as is well known, only the left optometry unit 10L (the part that examines the left eye E of the subject 22) will be described.

  In the optometry unit 10L, rotary desks 25 to 29 shown in FIG.

  Each rotary desk 25-29 is provided with a circular opening 30 at equal intervals in the circumferential direction, and gears 25G-29G are formed on the outer periphery of each rotary desk 25-29.

  A drive gear (not shown) is engaged with each of the gears 25G to 29G, and the drive gear is rotationally driven by pulse motors M1 to M6 (see FIG. 6). Since the rotary desks 25 to 29, the drive gears 25G to 29G, the pulse motors M1 to M6 and the like can be arranged and linked in a well-known manner, detailed description thereof is omitted.

  A plurality of spherical power lenses (not shown) having different spherical powers by 0.25D, for example, are fitted into the circular openings 30 of the rotary desk 25 one by one as an inspection optical element. A plurality of spherical power lenses (not shown) having different spherical powers by 3D are fitted into the circular openings 30 of the rotary desk 26 one by one. Further, an astigmatic lens (not shown) is fitted in each circular opening 30 of the rotary desk 27 as an inspection optical element.

  As shown in FIG. 4, a horizontal prism (horizontal auxiliary optical member: auxiliary optical member) 50 for horizontal oblique inspection is fitted into the circular opening 30C of the rotary desk 28, and a vertical oblique position is inserted into the circular opening 30D. A vertical prism (vertical auxiliary optical member: auxiliary optical member) 51 for inspection is fitted. In addition, the other circular openings 30 are fitted with inspection prisms (optical members: inspection horizontal prisms), which are inspection optical elements for horizontal oblique inspection having different correction powers. The horizontal prism 50 is a known rotary prism that changes the horizontal refraction angle, and the vertical prism 51 is a known rotary prism that changes the vertical refraction angle.

  The horizontal prism 50 separates the presented visual target in the horizontal direction, and the vertical prism separates the presented visual target in the vertical direction.

  Similarly, a plurality of circular openings 30 (see FIG. 3) of the rotary desk 29 have inspection prisms (optical members: inspection vertical prisms) that are inspection optical elements for vertical oblique inspection having different correction powers. In addition, a Maddox rod lens or the like for inclining inspection by the line light by the Maddox rod is disposed. The inspection prism, the oblique inspection Maddox rod lens, and the like are well known and are not shown.

It should be noted that at least one circular opening 30 of each of the rotary desks 25 to 29 is used for performing an optometric examination without applying a correction force. Reference numeral 30 </ b> A is attached to the through-opening 30. Further, the circular openings 30 of the respective rotary desks 25 to 29 are provided with shielding plates 30B adjacent to the through-openings 30A so that the subject 22 cannot visually recognize the target chart.
[Control circuit]
<Main control device 1>
The target presentation (presentation) device 2, the controller 3, and the subjective optometry device 4 are connected to the main control circuit (main control means) 314 of the main control device 1 as shown in FIG.

As shown in FIG. 6, the main control circuit 314 is connected to the power supply circuit 315, the arithmetic control unit (arithmetic control circuit) 316 that is operated by the power supplied from the power supply circuit 315, and the arithmetic control unit 316. An image processing circuit 317 and a main memory 320 connected to the arithmetic control unit 316 are included. The main memory 320 stores data such as target images and menus that are selected and operated by the controller 3.
<Target indicator 2a>
A target display control circuit (target control device) 400 of the target indicator 2a shown in FIG. 6 is provided in the case 2c of the target indicator 2a shown in FIG. The target display control circuit 400 includes a DVI (digital visual interface) 401, an arithmetic control unit 402, a liquid crystal drive circuit 403, and a readable / writable memory 405 such as an EEPROM. The target display control circuit 400 uses an MPU (microprocessor unit) having a minimum capability necessary to control the display body (liquid crystal display body) 2d of the target display 2a.

  The memory 405 is provided with 128-byte display information storage areas 00h to 7Fh in the EDID format of FIG. 6A reserved for storing (recording) the EDID (Extended Display Identification Data) of the target indicator 2a. ing.

  This EDID is used when the target display 2a, which is a liquid crystal display (monitor), is plug-and-played, and the setting value of the target display 2a, which is the connection source, is transferred to the main control circuit 314 of the main control device 1, which is the connection destination. It is display specific information to convey. The target indicator 2a is configured to realize plug and play with the main control device 1 as shown in FIG. 5 by two techniques called EDID and DDC.

  This EDID is a 128-byte binary file describing characteristics unique to the target indicator 2a such as the manufacturer's name (Vendor ID) and model (Product ID) in addition to the corresponding frequency and resolution. 2a is stored (stored) in the memory 405. This EDID is read out by the DDC from the target indicator 2a to the arithmetic control unit 316 side of the main control circuit 314.

  In addition, the arithmetic control unit 316 of the main control circuit 314 uses two signal lines in the display cable, SDA (Serial Data) and SCL (Serial Clock) to start the system or connect the target indicator 2a. The EDID is read from the inside of the target indicator 2a.

  At this time, the arithmetic control unit 316 of the main control circuit 314 reads a specification in the target indicator 2a using a standard called DDC (Display Data Channel, that is, VESA Display Data Channel) at the time of activation, and displays the display of the arithmetic control unit 316. It stores in a container information storage unit (not shown). Using this information, an optimal video signal is generated by a graphics mechanism and output. The display information storage unit may be a storage area such as a registry, or a storage area set other than the registry.

  The DDC (Display Data Channel) referred to here is a standard for exchanging various information between the target indicator 2a and the arithmetic control unit 316 of the main control circuit 314, thereby realizing plug and play. That is. In this DDC, information such as the allowable resolution, color depth, scanning frequency, and product model number of the visual target display 2a can be exchanged between the visual target display 2a and the image processing circuit 317. With these pieces of information, the setting information of the visual target indicator 2a is taken over, and the setting is automatically performed according to the performance of the visual target indicator 2a.

  Not all of the EDID storage areas 00h to 7Fh reserved for realizing the plug-and-play are used for storing (recording) the unique information of the visual target indicator 2a.

  Among the display information storage areas 00h to 7Fh, the addresses 00h to 47h are display specific information storage areas (first specific information storage areas) secured for storing (recording) the specific information of the visual target display 2a. Thus, the storage area indicated by the addresses 48h to 7Dh is not used for storing the unique information of the visual target indicator 2a. Therefore, the storage areas of the addresses 5Ah to 6Bh and the addresses 6Ch to 7Dh can be used as the individual difference information storage section (second unique information storage area).

  Addresses 00h to 47h include specific information (Header Information, Basic display parameters, Chromatity coordinate, Estimated timing 1, Established timing, Estimated timing, as shown in Date of FIG. 6A). timing identification, Descriptor Block 1) is stored. In addition, an extension flag is stored in the address 7Eh, and a checksum is stored in the address 7Fh. The serial number is included in the Head Information, and the video input DVI and the video input VGA are included in the Basic display parameter.

  The remaining storage areas indicated by the addresses 48h to 7Dh are divided into a descriptor block 2 at addresses 48h to 59h, a descriptor block 3 at addresses 5Ah to 6Bh, and a descriptor block 4 at addresses 6Ch to 7Dh. Descriptor Block 2 stores the monitor name, Descriptor Block 3 stores DVI connection contrast information, and Address 6Ch to 7Dh Descriptor Block 4 stores VGA connection contrast information.

The main control circuit 314 of the main control device 1 reads all the EDID information in the memory 405 and stores it in the main memory 319 when the visual target indicator 2a of the main control device 1 is connected or activated. The main control circuit 314 reads the contrast information stored in the main memory 320 when performing a contrast visual acuity test and the like, and based on the read contrast information, “contrast control of chart display (image display) on the target indicator 2a ( By executing “correction control”, the target (chart) can be displayed on the target indicator 2a so as not to cause a difference in contrast based on the individual difference of the target indicator 2a. In other words, the main control circuit 314 is based on the contrast information read from the main memory 320, and the target indicator 2a under the contrast condition recorded in the main memory 320 in which the target (chart) selected by the controller 3 is set. Control to display on the screen.
<Contrast control data>
By the way, the contrast of the display unit (display screen) 2d1 is determined by the ratio of white to black. The ratio of white to black is represented by 8 bytes (256 bits) of digital expression when white is displayed on the display unit (display screen) 2d1 in digital form.

  That is, when the lightness is 0% (“000”), the darkest black state is obtained. When the lightness is 100% (“256”), the lightest white state is obtained. Therefore, the lightness goes from 0% to 100%. To change from a dark black state to a bright white state. Accordingly, when the brightness of white when the white is 100% is “256”, the black is 0% and thus becomes “000”. If the ratio of white to black is 50%: 50%, the gradation of white is 128 and the gradation of black is 128.

  The contrast of the image to be displayed on the display unit (display screen) 2d1 of the target indicator 2a is set at the white / black ratio, and the image is displayed on the target indicator 2a at the set white / black ratio. The contrast of the image displayed on the display unit (display screen) 2d1 of the target indicator 2a varies depending on the individual difference of the target indicator 2a. It is necessary to detect a difference in display bright contrast due to the individual difference of the target indicator 2a and correct the image so that an image can be displayed with the set contrast even if there is a difference in display bright contrast. For this correction, it is necessary to obtain contrast information (contrast control data) of the visual target indicator 2a.

  This contrast information is acquired using the personal computer PC and luminance meter 500 shown in FIG. 5B. At the time of acquisition, the target indicator 2a and the luminance meter 500 are connected to the personal computer PC, and the luminance meter 500 is disposed in front of the display unit (display screen) 2d1 of the target indicator 2a. The distance between the luminance meter 500 and the display unit (display screen) 2d1 is set to a distance corresponding to the optometry distance.

  The optometry distance is, for example, 5 m in the case of a normal distance test, and 30 cm in the case of a near-field test. However, the optometry distance may be a distance other than that exemplified.

  Further, the luminance meter 500 is moved at a predetermined interval (for example, every 50 cm or every 1 m) from a position of 30 cm to a position of 5 m with respect to the display unit (display screen) 2d1 of the target indicator 2a. You may acquire the brightness | luminance information of the optotype indicator 2a as contrast information.

  Such acquisition of contrast information is performed in a room that is not affected by outside light.

  For example, when white represents 100% with 256 gradations, a command (instruction) to display with the brightness of the display unit (display screen) 2d1 with a contrast of 50% gradation is output to the target indicator 2a. When the image signal output from the personal computer PC is set and the image signal based on this setting is input to the target indicator 2a, the target indicator 2a has no individual difference due to, for example, a liquid crystal or a backlight. If the ratio of white to black in the part (display screen) 2d1 is displayed at 50%: 50%, the contrast of the set brightness is obtained.

  However, there are cases where the target indicator 2a has individual differences due to, for example, liquid crystal or backlight, and the white (black) ratio of the display unit (display screen) 2d1 may not be displayed at 50%: 50%. For example, when the brightness of the display unit (display screen) 2d1 is slightly dark from the brightness information obtained from the luminance meter 500, or when the brightness of the display unit (display screen) 2d1 is slightly brighter It is.

  For example, when the brightness of the display unit (display screen) 2d1 is slightly dark from the luminance information obtained from the luminance meter 500, the personal computer determines that the white gradation set at the gradation 128 is, for example, 129 Let the PC. In order to display a white / black ratio of 50%: 50% on the target indicator 2a, an image signal set so that the gradation of white is 129 and the gradation of black is 127 is used as a target. Correction contrast information to be input to the display 2a is acquired.

  The bit data of 129, which is the correction data (correction information) of the target indicator 2a for setting the contrast of the display unit (display screen) 2d1 to 50%, is the individual difference of the target indicator 2a. And contrast information (contrast correction information). Such contrast information (contrast correction information) is obtained by changing the ratio of white and black for each predetermined value.

  The acquisition of contrast information is executed by starting a contrast information acquisition program by the personal computer PC. This contrast information acquisition program changes the brightness of the display unit (display screen) 2d1 by changing the ratio of white to black every 2.5% (or every 5%, 12.5%, 25%, 50%). When this is done, the brightness of the display unit (display screen) 2d1 is acquired by the luminance meter 500 as 8-byte data.

  At this time, the ratio of white and black that sets the brightness of the display unit (display screen) 2d1 and the ratio of white and black of the actual display unit (display screen) 2d1 are acquired and recorded in association with each other.

  From the acquired white / black ratio of the actual display section (display screen) 2d1, the level of gradation to be increased / decreased to obtain the contrast with the set white / black ratio is obtained. This information is used as contrast information.

When expressing the contrast using the maximum value Lmax and the minimum value Lmin of the brightness,

It becomes. If Lmax is set to 100 and Lmin is adjusted so that the contrast rate of the image displayed on the target indicator 2a is 50%, Lmin = 33.3.

  Therefore, the personal computer PC displays an image on the target indicator 2a with Lmax = 100 and Lmin = 33.3, and measures the luminance with the luminance meter 500. As a result, if the luminance as output from the personal computer PC is measured, an image with a contrast ratio of 50% is displayed on the target indicator 2a. However, when an image having a contrast ratio of 50% is not displayed on the target indicator 2a from the luminance measured by the luminance meter 500, the value of Lmax or Lmin is increased or decreased to display the image on the target indicator 2a. The image to be adjusted is adjusted to have a contrast ratio of 50%. The increase / decrease value obtained for the adjustment of Lmax or Lmin is executed by the personal computer PC, and the increase / decrease value of Lmax or Lmin at this time is acquired as contrast information for contrast correction of the visual target indicator 2a.

  The storage area indicated by the addresses 5Ah to 7Dh in which the display device unique information is not stored is used as the individual difference information storage unit (second unique information storage region), and contrast information for contrast correction of the target display device 2a is used. It memorize | stores in an individual difference information storage part (2nd intrinsic | native information storage area).

  The arithmetic control unit 402 controls driving of the liquid crystal driving circuit 403 based on R, G, B image data from the input image signal, and the liquid crystal driving circuit 403 displays the display unit (liquid crystal display unit) of the display body 2d. An image is displayed in 2d1.

  Further, the main control circuit 314 does not have the necessary display conditions for the target display, that is, the specifications (display conditions) in which the frequency and resolution of the target display 2a are set for the target display. Alternatively, when the model number of the designated manufacturer is not provided, control is performed so that the target image signal is not output (prohibited) to the target indicator 2a. As a result, erroneous measurement and erroneous inspection can be prevented with a simple configuration.

  As contrast information, color information for contrast chart display is set. The color information may have RGB values. However, since the target is composed of brightness of white and black that does not use color, the same value is applied to the RGB values. Therefore, as described below, each luminance information only needs to record one value, and the recording capacity of addresses 5Ah to 7Dh can be reduced.

For example,
White: RGB (255, 255, 255) → FFh, FFh, FFh → FFh
Gray: RGB (128, 128, 128) → 80h, 80h, 80h → 80h
Black: RGB (0, 0, 0) → 0h, 0h, 0h → 0h
In this example, white RGB (255, 255, 255) is FFh, FFh, FFh, but white RGB (255, 255, 255) is represented only by FFh. Similarly, black RGB (0, 0, 0) is 0h, 0h, 0h, but black RGB (0, 0, 0) is represented only by 0h.
<Controller 3>
On the optometry table 5, a controller (selection means) 3 is placed as shown in FIG. The controller 3 includes a monitor display unit 3c including an operation unit 3a, a mouse 3b, and liquid crystal. A touch panel type liquid crystal panel is used for the display unit 3c.
(Operation unit 3a)
As shown in FIG. 1, the operation unit 3a has a keyboard KB as a screen operation means. Since a well-known configuration can be adopted for the keyboard KB of the controller 3 for optometry, detailed description thereof is omitted.
(Display unit 3c)
Further, in the upper half of the display unit 3c, “spherical surface”, “astigmatism”, “addition”, “axis”, as shown in FIGS. 7 and 8 (in FIG. 8, “horizontal”, “vertical”). Etc., and “right” and “left” optometry data display portions DRa and DLa are provided on the left and right sides of the item display portion Ma.

  Further, optometry unit images 10L ′ and 10R ′ corresponding to the optometry units 10L and 10R in FIG. 1 are displayed at the center in the vertical direction of the display unit 3c, and also correspond to the optometry windows Lw and Rw in FIG. The optometry window images Lw ′ and Rw ′ are displayed on both sides of the display of the interpupillary distance display part PD.

  In this display, when the optometry window images Lw ′ and Rw ′ are white, the optometry windows Lw and Rw are not shielded by the shielding member, and the optometry window images Lw ′ and Rw ′ are gray. In the case of, the optometry windows Lw and Rw are shielded by the shielding member. Here, the display of white or gray in the optometry window images Lw ′ and Rw ′ is an example for convenience of explanation. The open state of the optometry windows Lw and Rw in colors other than white or gray is shown. You may show a shielding state.

  A dial image DL and “+ arrows” and “−arrows” are displayed on the right side of the central portion in the vertical direction of the display unit 3c.

  Further, on the left side of the lower half of the display unit 3c, as shown in FIG. 7, buttons “Chart1” to “Chart5” for selecting a chart group display and a selected chart display unit Ga are provided. On the right side of the lower half of the display unit 3c, a presentation chart display unit Gb that displays the selected chart as shown in FIG. 7 is provided. Then, by touching and selecting the buttons “Chart1” to “Chart5”, a plurality of different chart groups can be displayed on the selected chart display portion Ga of “Chart1” to “Chart5”. Moreover, the selected chart is displayed on the presentation chart display part Gb by touching and selecting one of the plurality of chart groups of the selection chart display part Ga.

  Such chart selection and display control are executed by the main control circuit 314 of the main control device 1 via a controller control circuit (controller control means) 43 inside the controller 3.

  The controller control circuit 43 includes a contrast control unit 43a, a liquid crystal drive circuit 43b, and a readable / writable memory 44 such as an EEPROM.

The controller control circuit 43 uses an MPU (microprocessor unit) having a minimum capability necessary for controlling the operation of the controller 3. The memory 44 stores an EDID file in which EDID (specification information data) of the controller 3 is stored (recorded). The EDID of the controller 3 is a unique ID for transmitting the model name, setting value, and the like of the controller 3 that is the connection source to the arithmetic control unit 316 of the connection target main control device 1 when the controller 3 is plug and play. .
<Control circuit of the measuring head 4a of the subjective optometry apparatus 4>
The measuring head 4a of the subjective optometry apparatus 4 includes a control circuit (optical member control means) 4b as shown in FIG. The control circuit 4 b includes an arithmetic control circuit (CPU) 45 and a readable / writable memory 4 c such as an EEPROM connected to the arithmetic control circuit (CPU) 45. The memory 4c stores control information for the measuring head 4a.

  Further, the horizontal prism 50 and the vertical prism 51 are provided in the left and right optometry units 10R and 10L of the measurement head 4a as described above.

  The horizontal prism 50 is rotationally driven around the center (optical axis) of the circular aperture 30C by a pulse motor Prm, and the vertical prism 51 is rotationally driven around the center (optical axis) of the circular aperture 30C by a pulse motor Prm '. It is supposed to be. In addition, the horizontal prism 50 is rotated by a pulse motor Prm to change the horizontal refraction angle, and the vertical prism 51 is rotated by a pulse motor Prm 'to change the vertical refraction angle. It has become. The pulse motors Prm and Prm ′ are driven to rotate in the forward or reverse direction by a drive pulse from the arithmetic control circuit 45.

  The arithmetic control circuit 45 obtains the prism value of the horizontal prism 50 from the number of driving pulses to the pulse motor Prm and the rotation direction, and obtains the refraction angle in the horizontal direction of the optical axis from this prism value. . The arithmetic control circuit 45 obtains the prism value of the vertical prism 51 from the number of driving pulses to the pulse motor Prm ′ and the rotation direction, and obtains the refraction angle in the vertical direction of the optical axis from this prism value. Yes. Further, the pulse motors M1 to M6 are also driven to rotate in the forward or reverse direction by a drive pulse from the arithmetic control circuit 45.

By touching one of the chart groups displayed on the operation unit 3a, the mouse 3b or the selected chart display unit Ga, a desired target chart is selected from the chart groups displayed on the selected chart display unit Ga. can do. And the controller control part 43a will input a selection signal into the calculation control part 316, if a desired target chart is selected from the chart group displayed on the selection chart display part Ga. The arithmetic control unit 316 inputs a control signal to the arithmetic control unit 402 of the target presentation device 2. The arithmetic control unit 402 causes the selected chart to be presented on the display unit 2d1 of the chart presentation device 2 in accordance with the input control signal. Further, the arithmetic control unit 316 performs drive control of the pulse motors M1 to M6 of the optometry unit 10L via the arithmetic control circuit 45 according to the selected optotype chart, and thereby the optometry windows of the optometry units 10L and 10R. Inspection optical elements corresponding to the selected target chart are arranged in Lw and Rw.
[Action]
Next, the operation of the optometry system having such a configuration will be described.
(1). Connection of devices When the target presentation device 2 is connected to the main control circuit 314 in the main control device 1, the target display 2a that is the connection source during plug-and-play of the target display 2a that is a liquid crystal display (monitor). The EDID information such as the model name and setting value is read from the memory 405 into the main control circuit 314 of the main control device 1 that is the connection destination, and this EDID information is displayed on the display information storage unit (not shown) of the main control circuit 314 Recorded).

  At this time, the contrast information (contrast correction information based on gradation bit data) recorded in the EDID information in the memory 405 due to the individual difference of the target presentation device 2 is also read into the main control circuit 314 and recorded in the main memory 320. Is done.

When the controller 3 is connected to the main control circuit 314 in the main control device 1, the main control circuit 314 reads out the EDID storing (recording) the EDID (specification information data) of the controller 3 from the memory 44, 320.
(2). Chart display (image display) on the display unit 3c of the controller 3
As described above, the main controller 1 is provided with the main control circuit 314, and the data memory 320 of the main control circuit 314 stores data (files) such as target images and menus selected and operated by the controller 3. It is remembered.

  The main control circuit 314 starts its operation when the main control device 1 is turned on, supplies power to the controller 3, and starts the control operation of the controller 3. At this time, the main control circuit 314 inputs the initial screen data for optometry stored in the data memory 320 to the controller control circuit 43 of the controller 3 via the image processing circuit 317. The controller control circuit 43 displays the initial screen shown in FIG. 7 on the display unit 3 c of the controller 3 when the initial screen data is input.

When the controller 3 operates the keyboard KB, mouse 3b, touch panel portion of the display unit 3c, etc., the controller 3 inputs this operation signal to the main control device 1 to the main control circuit 314.
(3). Chart Display and Contrast Control on the Target Display 2a of the Target Presenting Device 2 When the target chart icon is selected from the chart group displayed on the display unit 3c of the controller 3, the arithmetic control unit 316 uses the target display 2a. A chart image to be displayed is generated, and the chart image is displayed on the visual target indicator 2a through the image processing circuit 317. At the same time, the main control circuit 314 displays the chart image displayed on the visual target indicator 2a on the display unit 3c of the controller 3 through the image processing circuit 317 for confirmation.
(4). Maddox oblique inspection (display of controller 3)
When the button “Chart2” in FIG. 7 is pressed and the fixation target is touched, the main control circuit 314 of the main control device 1 enters the mode for the Madox rod oblique inspection through the controller control unit 43a of the controller 3. . In this mode, the main control circuit 314 causes the oblique chart inspection chart group shown in FIG. 8 to be displayed on the selection chart display section Ga of the display section 3 c of the controller 3 via the controller control section 43 a of the controller 3.

  When the chart MLc for oblique inspection of the Madox rod in the oblique inspection chart group is touched, the main control circuit 314 of the main control device 1 is connected to the chart MLc via the controller control unit 43a of the controller 3. The same image is displayed on the presentation chart display unit Gb. Here, the Maddrod oblique inspection chart MLc is obtained by displaying a white circle at the center of a black base.

Further, by operating the keyboard KB of the controller 3 or the mouse 3b or the touch panel of the display unit 3c, a main control circuit 314 and a controller control unit 43a generate a Maddox lens schematic diagram for the vertical Maddox rod as shown in FIG. 8A. The optometry window image Rw ′ of the display unit 3c is displayed, or as shown in FIG. 9A, the madox rod lens schematic diagram for the horizontal Maddox main control circuit 314 and the controller control unit 43a is used to display the optometry window image of the display unit 3c Lw 'is displayed.
(Display on the target indicator 2a)
In addition, the main control circuit 314 does not output a signal for displaying the same image as the chart MLc on the optotype display 2a in the optometry mode for the Maddrod rod oblique examination, and displays the optotype on the optotype display 2a. A dark image signal for blackening the screen of the display unit 2d1 is input to the control circuit 400 as a mode detection image signal. That is, a gradation bit signal “000” that is an R, G, B luminance signal is input to the arithmetic control unit 402 of the visual target display control circuit 400. If the image signal input to the arithmetic control unit 402 of the target display control circuit 400 is a dark image signal that makes the screen black, the inspection from the dark image signal indicates that the mode is a Madox rod oblique inspection mode. Can be detected.

  At this time, in addition to the dark image signal that makes the screen of the display unit 2d1 black, the main control circuit 314 is specific to the oblique examination for optometry (for oblique examination) that detects the input of this dark image signal. A signal can also be input to the arithmetic control unit 402. In this case, it is possible to more reliably detect that the inspection is the mode for inspecting the Maddox rod.

  As the diagnostic examination specific signal for optometry (for oblique examination), an image signal for displaying the same image as the chart MLc prior to the dark image signal for blackening the screen may be input to the arithmetic control unit 402 for a short period of time. The mode detection image signal may be input to the arithmetic control unit 402 in addition to the mode detection image signal for detecting that the mode is a Maddox rod oblique inspection mode in addition to the dark image signal for blackening the screen. .

  When the arithmetic control unit 402 detects the mode for Maddrod's oblique position inspection from the mode detection image signal, the arithmetic control unit 402 activates the fixation lamp driving circuit 404 to turn on the fixation lamp 200 by the fixation lamp driving circuit 404. Let

The dark image signal, which is the mode detection image signal, may be a gray signal having a gradation close to black “000” or an image signal of another color close to black “000”. .
(Measurement head 4a)
・ Horizontal (left and right) oblique inspection On the other hand, the main control circuit 314 enters a mode for Madox rod oblique inspection, and a schematic diagram of a Madox rod lens for a vertical Madox rod as shown in FIG. When displayed on the optometry window image Rw ′ of the display unit 3 c of the controller 3, the arithmetic control circuit (CPU) 45 of the control circuit 4 b of the subjective optometry apparatus 4 is controlled to operate, and the arithmetic control circuit (CPU) 45 performs pulse control. An optometrist window image of a Maddox lens (not shown) that drives and controls the motor M6, rotates the rotating desk 29 by the pulse motor M6, and visually recognizes the line light MLV by the vertical Maddox rod shown in FIG. 8B. Let Rw face.

  Along with this, the arithmetic control circuit (CPU) 45 of the control circuit 4b of the subjective optometry apparatus 4 drives and controls the pulse motor M8, and a horizontal prism (horizontal auxiliary optical member: auxiliary) for the horizontal oblique inspection of the rotary desk 28. The optical member 50 is exposed to the optometry window image Rw.

  In this state, when the subject 22 visually recognizes the optotype indicator 2a via the left and right optometry windows Rw and Lw, the left eye of the subject 22 is fixed with a fixation lamp via a Maddox lens (not shown). 200, the fixation lamp 200 is visually recognized as the line light MLV by the vertical line light source-shaped Madox rod shown in FIG. 8B. On the other hand, since the fixation lamp 200 visually recognizes the fixation lamp 200 via the horizontal prism 50, the right eye of the examinee 22 shows the fixation lamp 200 as a circle. It is visually recognized as a point light source target 200 '.

  At this time, since the black background color is displayed on the display unit 2d1 of the target indicator 2a, the line light MLV by the Maddox rod and the target 200 'of the point light source are shown in FIG. 8B. It is visually recognized as displayed on the black background.

  At the time of visual recognition, the + arrow or − arrow of DL of the controller 3 is touched or a dial (not shown) of the keyboard KB of the controller 3 is rotated. As a result, the arithmetic control unit 316 of the main control circuit 314 drives and controls the pulse motor Prm via the arithmetic control circuit (CPU) 45 of the subjective optometry apparatus 4, and the pulse value of the horizontal prism 50 is set by the pulse motor Prm. The prism value of the horizontal prism 50 is changed by increasing or decreasing it. By this operation, the line light MLV by the Maddox rod perpendicular to the visual target 200 ′ visually recognized by the subject 22 is relatively approached and separated. Therefore, the examiner confirms from the response of the subject 22 whether the line light MLV by the vertical Maddox rod matches the target 200 'by this operation, and examinees the subject from the prism value at the coincidence. It is possible to know the extent of the 22 horizontal oblique positions.

The prism value of the horizontal prism 50 can be obtained from the rotational driving direction of the pulse motor Prm that drives the horizontal prism 50 and the number of rotational driving pulses.
-Vertical (vertical) oblique inspection When the Maddrod lens schematic diagram for the horizontal Maddox rod is displayed in the optometry window image Lw 'of the display unit 3c as shown in FIG. 9A, the subjective optometry The operation control circuit (CPU) 45 of the control circuit 4b of the apparatus 4 is operated and controlled, the pulse motor M6 is driven and controlled by the operation control circuit (CPU) 45, the rotating desk 29 is rotated by the pulse motor M6, and FIG. A Madox rod lens (not shown) for visually recognizing the line light MLH by the horizontal Maddox shown in b) is made to face the optometry window image Rw.

  Along with this, the arithmetic control circuit (CPU) 45 of the control circuit 4b of the subjective optometry apparatus 4 drives and controls the pulse motor M8, and the vertical prism (horizontal auxiliary optical member: auxiliary) for the vertical oblique inspection of the rotary desk 28. The optical member 51 is made to face the optometry window image Rw.

  In this state, when the subject 22 visually recognizes the optotype indicator 2a via the left and right optometry windows Rw and Lw, the right eye of the subject 22 is fixed by a fixation lamp via a Maddox lens (not shown). 200 is visually recognized, and the fixation lamp 200 is visually recognized as the line light MLH by the linear light source-like horizontal Madox rod shown in FIG. 9B. On the other hand, since the fixation lamp 200 visually recognizes the fixation lamp 200 via the vertical prism 51, the left eye of the examinee 22 indicates the fixation lamp 200 as a circle. It is visually recognized as a point light source target 200 '.

  At this time, since the black background color is displayed on the display portion 2d1 of the target indicator 2a, the line light MLH by the Maddox rod and the target 200 'of the point light source are shown in FIG. 9B. It is visually recognized as displayed on the black background.

  At the time of visual recognition, the + arrow or − arrow of DL of the controller 3 is touched or a dial (not shown) of the keyboard KB of the controller 3 is rotated. As a result, the arithmetic control unit 316 of the main control circuit 314 drives and controls the pulse motor Prm ′ via the arithmetic control circuit (CPU) 45 of the subjective optometry apparatus 4, and the prism of the vertical prism 51 is controlled by the pulse motor Prm ′. The prism value of the vertical prism 51 is changed by increasing or decreasing the value. By this operation, the line light MLH by the Maddox rod perpendicular to the visual target 200 ′ visually recognized by the subject 22 relatively approaches and separates. Therefore, the examiner confirms from the response of the subject 22 whether or not the line light MLH by the vertical Maddox rod matches the target 200 'by this operation, and examinees the subject from the prism value when they coincide. It is possible to know the degree of the 22 vertical oblique positions.

The prism value of the vertical prism 51 can be obtained from the rotational drive direction of the pulse motor Prm ′ that drives the vertical prism 51 and the number of pulses of rotational drive.
[Other examples]
As described above, the optotype indicator 2a includes the rectangular case 2c and the display main body (liquid crystal display main body) 2d, and the case 2c includes the rectangular frame portion 2c2. In the above-described embodiment, the example in which the fixation lamp 200 used for the oblique inspection or the like is attached to the upper side portion Cus of the rectangular frame portion 2c2 as an off-screen lamp is shown, but the off-screen lamp is not necessarily attached to the fixation lamp 200. It is not limited. For example, a configuration in which an off-screen lamp such as an LED for performing a glare test or the like is provided in the target indicator 2a may be employed.

  FIG. 10 shows an example in which an off-screen lamp for performing a glare test (glare inspection) is provided on the visual target indicator 2a. In FIG. 10, for example, a plurality of light emitting lamps 500 such as LEDs are provided on the upper side Cus, the side CsL, the side CsR, the lower side Cds, etc. of the rectangular frame 2c2 of the case 2c. Thus, an example in which a plurality of light-emitting lamps 500 are arranged around the display unit 2d1 that is a display screen is shown.

  In this embodiment, after the glare test is selected from a menu (not shown) by operating the controller 3, the keyboard KB, the mouse 3b, the touch panel of the display unit 3c, etc. are operated, and this operation signal is sent to the main control device 1. Is input to the main control circuit 314 and a chart (an image for optometry) corresponding to the operation signal is displayed on the display unit 3 c via the controller control circuit 43.

  Then, when the chart (optometry image) is displayed on the display unit 3c of the controller 3, the main control circuit 314 displays the image data of the chart (optometry image) displayed on the presentation chart display unit Gb of the display unit 3c. The image signal is input to the target display control circuit 400 of the target display 2a shown in FIG. 11 under the condition corresponding to the display specific information (data based on EDID) of the target display 2a.

  At this time, the main control circuit 314 includes the glare test mode detection image signal as the glare test-specific mode detection image signal indicating the glare test optometry mode in the image signal input to the visual target display control circuit 400. It comes to let you.

  As the glare test mode detection image signal, for example, a glare test mode detection image is displayed on a portion outside the portion where the chart (optimization image) of the display unit (display screen) 2d1 of the target indicator 2a is displayed. It may be an image signal to be generated. This glare test mode detection image may be displayed, for example, partially along the periphery of the display unit (display screen) 2d1 or on the entire periphery. The glare test mode detection image may be a character, or may be a single color image in which the contrast is different from the portion where the chart (optometry image) is displayed.

  When the arithmetic control circuit 402 of the optotype display control circuit 400 in FIG. 11 detects that the input image signal includes a mode detection image signal specific to the glare test, it activates the glare lamp drive circuit 406. The glare lamp driving circuit 406 controls the glare lamp 500 to light up.

  In this state, a target such as a Landolt ring used for a visual acuity test, for example, is displayed on the display unit (display screen) 2d1 of the target indicator 2a, and the subject 22 confirms how the subject 22 sees the target 22 Check your vision. In this embodiment, the Landolt ring used for the visual acuity test is shown as an example. However, the visual target (chart) displayed on the display unit (display screen) 2d1 by the glare test is limited to the visual target used for the visual acuity test. is not.

  As described above, the optometry system according to the embodiment of the present invention includes the optotype indicator 2a provided with the indicator main body 2d for displaying the optotype on the display unit 2d1 that is a display screen, and the optotype indicator. An off-screen lamp (fixation lamp 200, glare lamp 500, etc.) provided outside the display screen 2a and used for examining the eye to be examined, and an image signal of the selected target are displayed on the target indicator 2a. Control means (main control device 1) provided with a main control circuit 314 for inputting and displaying an image based on the image signal on the display screen. In addition, the main control circuit 314 displays the screen when the image signal includes a mode detection image signal in an optometry mode that requires lighting of the off-screen lamp (fixation lamp 200, glare lamp 500, etc.). External lamps (fixation lamp 200, glare lamp 500, etc.) are turned on.

  According to this configuration, it is possible to perform the lighting control of the off-screen lamps (fixation lamp 200, glare lamp 500, etc.) provided in the visual target indicator 2a with a small number of parts.

  In the optometry system according to the embodiment of the present invention, the out-of-screen lamp is a fixation lamp 200 provided on the upper side of the display screen, and the mode detection image signal is a signal for oblique examination using a Madox rod. It is said.

  According to this configuration, the lamp outside the display screen provided in the target indicator 2a is the fixation lamp 200, and the image signal for mode detection is a signal for an oblique inspection using the Madox rod. The lighting control of the fixation lamp 200 for the oblique position inspection can be performed with a small number of parts. The mode detection image signal for lighting the fixation lamp is a dark image signal of black or a color close to black, but the mode detection image signal for lighting the fixation lamp is a color close to black or black. It is not limited to the dark image signal. For example, before outputting a dark image signal of black or a color close to black, the image signal of the chart for oblique inspection using the Madox rod is displayed as a mode detection image signal for lighting the fixation lamp. You may input into the device 2a. In addition, as a mode detection image signal for lighting the fixation lamp, an image of the same color that is indistinguishable from an image of black or a color close to black and an image of a color close to black or black is displayed on the display screen. It is good also as an image signal displayed simultaneously.

  Furthermore, in the optometry system according to the embodiment of the present invention, the mode detection image signal is a dark image signal of black or a color close to black.

  According to this configuration, since the mode detection image signal is black or a dark image signal of a color close to black, it is possible to quickly execute the fixation lamp lighting control for the oblique position inspection.

  In the optometry system according to the embodiment of the present invention, the off-screen lamp is a glare lamp 500 provided around the display screen, and the mode detection image signal includes a glare test mode detection image signal. Yes.

  According to this configuration, the glare lamp 500 is used as the lamp outside the display screen provided in the visual target indicator 2a, and the glare test mode detection image signal is used as the mode detection image signal. Can be controlled with a small number of parts.

  In the optometry system described in the embodiment of the present invention, the off-screen lamp is turned on when the image signal includes a mode detection image signal in the optometry mode that requires the off-screen lamp to be turned on. The mode detection image signal is not limited to a specific one. For example, a control signal that is not used for image display may be used as the mode detection image signal. Further, the screen display may be stopped when a specific image signal included in the image signal is cut, and the off-screen lamp may be turned on. For example, when one of the horizontal synchronizing signal and the vertical synchronizing signal of the image signal is cut, the image display is not normally performed. Therefore, the screen display is stopped and the off-screen lamp is turned on. In this way, when the horizontal sync signal and the vertical sync signal are included in the image signal, when the horizontal sync signal (or vertical sync signal) included in the image signal is cut, the horizontal sync signal is not included. An image signal (or an image signal not including a vertical synchronization signal) may be determined as an image signal for mode detection in the optometry mode, and the off-screen lamp may be turned on.

DESCRIPTION OF SYMBOLS 1 ... Main control apparatus 2 ... Target presentation apparatus 2a ... Target display 2d ... Display-body main body 2d1 ... Display part (display scene)
3 ... Controller (Target selection device)
200 ... Fixation lamp (off-screen display lamp)
314: Main control circuit 500: Glare lamp (off-screen display lamp)

Claims (5)

A target indicator provided with a display main body for displaying a target image on a display unit which is a display screen;
Selecting means for selecting a target image to be displayed on the display;
An off-screen lamp provided outside the display screen of the target indicator and used for examining the eye to be examined;
An optometry system comprising: main control means for inputting an image signal of a selected target image to the target display and displaying the target image based on the image signal on the display screen;
The main control means turns on the off-screen lamp when the image signal includes a mode detection image signal in an optometry mode that requires the off-screen lamp to be turned on.   2. The optometry system according to claim 1, wherein the off-screen lamp is a fixation lamp provided on the upper side of the display screen, and the mode detection image signal is a signal for an oblique inspection using a Maddox rod. A characteristic optometry system.   The optometry system according to claim 2, wherein the mode detection image signal is a dark image signal of black or a color close to black.   2. The optometry system according to claim 1, wherein the off-screen lamp is a glare lamp provided around the display screen, and the mode detection image signal includes a glare test mode detection image signal. system.   2. The optometry system according to claim 1, wherein the image signal for mode detection is an image signal including only one of a horizontal synchronization signal and a vertical synchronization signal.