JP6587484B2 - Ophthalmic equipment - Google Patents

Description

  The present invention relates to an ophthalmic apparatus.

  As an ophthalmologic apparatus, an ophthalmologic apparatus that measures eye refractive power and corneal shape as eye characteristics of a subject eye by projecting measurement light onto the subject eye has been proposed (see, for example, Patent Document 1). In this ophthalmologic apparatus, the eye refractive power and the corneal shape are measured (inspected) while a fixation target is projected onto the eye to be examined and the line of sight of the eye to be examined is fixed.

No. 03-042885

  Here, in the conventional ophthalmologic apparatus described above, if the eye refractive power of the eye to be examined is not grasped when measuring the corneal shape, the fixation target cannot be projected at a position that matches the eye refractive power of the eye to be examined. The fixation target cannot be properly recognized. For this reason, in an ophthalmologic apparatus, there is a risk that the corneal shape may be measured in a state where the line of sight of the subject's eye cannot be fixed appropriately, leading to the acquisition of measurement results that are not good in the corneal shape, or re-measurement. I'll be relaxed.

  The present invention has been made in view of the above circumstances, and the measurement (for example, corneal shape) by the second measurement system is appropriately performed even if the measurement value (for example, eye refractive power) in the first measurement system is not grasped. It is an object of the present invention to provide an ophthalmologic apparatus that can be executed.

  In order to solve the above-described problems, an ophthalmologic apparatus according to the present invention includes a target projection system that presents a target to the eye to be examined, a light beam projected onto the fundus of the eye to be examined, and a reflection from the fundus of the eye to be examined. A first measurement system for receiving light; a second measurement system for projecting a light beam onto the anterior eye portion of the eye to be examined; and obtaining information on the anterior eye portion from reflected light from the anterior eye portion; A measurement unit and a processing unit that executes measurement processing by the second measurement system. In the target projection system, the eye to be examined has a first visual target and a visual angle larger than that of the first visual target. A small second target is switched and presented.

  According to the ophthalmologic apparatus of the present invention, the measurement (for example, corneal shape) by the second measurement system can be appropriately executed without grasping the measurement value (for example, eye refractive power) by the first measurement system.

It is explanatory drawing which shows the whole structure of the ophthalmic apparatus 10 of Example 1 as an example of the ophthalmic apparatus which concerns on this invention. FIG. 3 is an explanatory diagram showing a configuration of a control system of the ophthalmologic apparatus 10 in a block diagram. 2 is an explanatory diagram for explaining an optical configuration of the ophthalmologic apparatus 10. FIG. It is explanatory drawing which shows the fixation target 31. FIG. It is explanatory drawing which shows the point-like target 32. 4 is a flowchart showing an eye characteristic measurement process (eye characteristic measurement method) executed by a processing unit 17. It is explanatory drawing similar to FIG. 3 for demonstrating the optical structure of 10 A of ophthalmic apparatuses of Example 2 as an example of the ophthalmic apparatus which concerns on this invention. It is explanatory drawing for demonstrating the structure of the turret board 22u of the turret part 22t of the target projection system 22A of 10 A of ophthalmologic apparatuses. It is explanatory drawing similar to FIG. 3 and FIG. 7 for demonstrating the optical structure of the ophthalmic apparatus 10B of Example 3 as an example of the ophthalmic apparatus which concerns on this invention. It is explanatory drawing which expands and shows the periphery of each glare light source 22k in order to demonstrate the periphery structure of each glare light source 22k in the branch optical path 22m of the target projection system 22B of the ophthalmologic apparatus 10B.

  Embodiments of an ophthalmologic apparatus according to the present invention will be described below with reference to the drawings.

  In the first embodiment, as an example of an ophthalmologic apparatus, a distance test, a near-field test, a contrast test, a glare test, and the like can be performed as a subjective test, and an eye refractometry, a corneal shape measurement, and the like can be performed as an objective test 1 shows an apparatus (ophthalmic apparatus 10). In addition, the ophthalmologic apparatus which concerns on this invention is not limited to the structure of the ophthalmologic apparatus 10 of Example 1. FIG.

  The ophthalmic apparatus 10 according to the first embodiment includes a base 11, a gantry 12, a head unit 13, a face receiving unit 14, an operation lever 15, and a display unit 16. In this ophthalmologic apparatus 10, the gantry 12 can be moved back and forth, right and left, up and down with respect to the base 11, the face receiving portion 14 is provided on the base 11, and the head portion 13 is provided on the gantry 12. The face receiving part 14 has a chin rest 14a and a forehead pad 14b, and fixes the face of the subject. The operation lever 15 is provided on the gantry 12 and is tilted to move the head portion 13 in the front / rear / left / right direction. By rotating around the axis, the head portion 13 is moved in the up / down direction. Become. The display unit 16 is provided in the head unit 13 and includes a liquid crystal display device (LCD monitor) as an example, and has a touch panel display screen 16a (see FIG. 3).

  The head unit 13 is provided with a processing unit 17 that comprehensively controls each unit of the ophthalmologic apparatus 10. As shown in FIG. 2, the processing unit 17 comprehensively controls the operation of the ophthalmologic apparatus 10 based on a program stored in the connected storage unit 18 or the built-in internal memory 17a. The processing unit 17 is connected to a glare light source 22k, a reflex measurement light source 23g, an alignment light source 25a, an alignment light source 26a, and a kerating light source 27b of each optical system, which will be described later, and appropriately turns them on and off. Further, the processing unit 17 includes an operation unit (imaging element 21g, display 22a, focusing lens 22e, VCC 22h, pinhole plate 22p, reflex light source unit 23a, focusing lens 23t (driving units thereof) described later for each optical system. )) Are connected and appropriately driven (including moving). Further, the processing unit 17 is connected to the head unit 13 (the gantry 12 (the moving mechanism thereof)), the operation lever 15 and the display unit 16, and follows the operation and program performed on the display screen 16 a of the operation lever 15 and the display unit 16. Then, the image acquired by the imaging element 21g is displayed on the display unit 16 as appropriate, and the above-described light sources and operation units are controlled as appropriate. An external device 19 that is an arbitrary device (device) is connected to the processing unit 17 (ophthalmic device 10). In the first embodiment, the external device 19 is a spectacle lens measurement device that measures optical characteristics of a lens, and a lens power as measurement data of a spectacle lens used by a subject is input. The external device 19 may be any other ophthalmologic apparatus, a device capable of reading and writing to a recording medium, a hospital information system (HIS) server used in a medical institution, a DICOM server, a hospital computer such as a doctor terminal, a medical device, etc. An out-of-hospital computer such as a mobile terminal used outside the institution, a personal terminal, a server or a terminal on the manufacturer side of the ophthalmic apparatus 10, or a cloud server may be used, and is not limited to the first embodiment.

  The head unit 13 is provided with an optical system for inspecting the eye to be examined. The optical system includes an observation system 21, a target projection system 22, an eye refractive power measurement system 23, a subjective examination system 24, an alignment system 25, an alignment system 26, and a kerato system 27, as shown in FIG. The observation system 21 observes the anterior segment of the eye E, the target projection system 22 presents the target to the eye E, the eye refractive power measurement system 23 measures the eye refractive power, The subjective examination system 24 performs a subjective examination. In Example 1, the eye refractive power measurement system 23 has a function of projecting a predetermined measurement pattern onto the fundus oculi Ef of the eye E and a function of detecting an image of the measurement pattern projected onto the fundus oculi Ef. For this reason, the eye refractive power measurement system 23 functions as a first measurement system that projects a light beam onto the fundus oculi Ef of the eye E and receives reflected light from the fundus oculi Ef. In the first embodiment, the subjective examination system 24 has a function of presenting a visual target to the eye E, and shares the optical element constituting the optical system with the visual target projection system 22. The alignment system 25 and the alignment system 26 perform alignment (alignment) of the optical system with respect to the eye E. The alignment system 25 is in a direction along the optical axis of the observation system 21 (front-rear direction) and the alignment system 26 is the light. Alignment in the direction perpendicular to the axis (vertical direction, horizontal direction) is performed.

  The observation system 21 includes an objective lens 21a, a dichroic filter 21b, a half mirror 21c, a relay lens 21d, a dichroic filter 21e, an imaging lens 21f, and an imaging device (CCD) 21g. In the observation system 21, the light beam reflected by the eye E (anterior eye portion) is imaged on the image sensor 21g by the imaging lens 21f through the objective lens 21a. For this reason, an anterior eye image E ′ is formed on the image sensor 21g by projecting (projecting) a later-described kerattling light beam, a light beam from the alignment light source 25a, and a light beam (bright spot image Br) from the alignment light source 26a. The The processing unit 17 causes the anterior segment image E ′ and the like based on the image signal output from the image sensor 21 g to be displayed on the display screen 16 a of the display unit 16. A kerato system 27 is provided in front of the objective lens 21a.

  The kerato system 27 includes a kerato plate 27a and a kerato ring light source 27b. The kerato plate 27a has a plate shape in which concentric slits are provided with respect to the optical axis of the observation system 21, and is provided in the vicinity of the objective lens 21a. The kerato ring light source 27b is provided in accordance with the slit of the kerato plate 27a. In this kerato system 27, the light beam from the lit kerato ring light source 27b passes through the slit of the kerato plate 27a, so that the eye E (cornea Ec) has a kerato ring light beam (corneal curvature measuring ring) for measuring the corneal shape. Projecting). The keratoling light beam is reflected by the cornea Ec of the eye E to be imaged by the observation system 21 on the image sensor 21g. Thereby, the image sensor 21g detects (receives) an image (image) of the ring-shaped keratoling light beam, and the processing unit 17 displays the image of the measurement pattern on the display screen 16a and the image (image sensor 21g). ) To measure the corneal shape (radius of curvature) by a known method. For this reason, the kerato system 27 projects a light beam onto the anterior eye part (cornea Ec) of the eye E and receives information on the anterior eye part (cornea Ec) from the reflected light from the anterior eye part (cornea Ec). It functions as a corneal shape measuring system that is a second measuring system to be acquired and that measures the corneal shape of the eye E to be examined. In the first embodiment, an example (kerato system 27) using a kerato plate 27a for measuring the curvature near the center of the cornea with a ring slit of about 1 to 3 is shown as the corneal shape measurement system. As long as the shape can be measured, a platide plate having multiple rings and capable of measuring the shape of the entire cornea may be used, and other configurations may be used, and the configuration is not limited to the configuration of the present embodiment. An alignment system 25 is provided behind the kerato system 27 (the kerato plate 27a).

  The alignment system 25 has a pair of alignment light sources 25a and a projection lens 25b. The light beams from the alignment light sources 25a are converted into parallel light beams by the projection lenses 25b, and the eye E to be examined is passed through an alignment hole provided in the kerato plate 27a. The parallel luminous flux is projected (projected) onto the cornea Ec. The processing unit 17 or the examiner moves the head unit 13 in the front-rear direction based on the bright spot (bright spot image) projected (projected) on the cornea Ec, thereby moving along the optical axis of the observation system 21 ( Align in the front-rear direction). This alignment in the front-rear direction is performed by adjusting the position of the head unit 13 so that the ratio between the distance between the two point images by the alignment light source 25a on the sensor 21g and the diameter of the keratling image is within a predetermined range. Here, the processing unit 17 may obtain an alignment shift amount from the ratio and display the alignment shift amount on the display screen 16a. Note that the alignment in the front-rear direction may be performed by adjusting the position of the head unit 13 so that the bright spot image Br is focused by an alignment light source 26a described later.

  The observation system 21 is provided with an alignment system 26. The alignment system 26 includes an alignment light source 26a and a projection lens 26b, and shares the half mirror 21c, the dichroic filter 21b, and the objective lens 21a with the observation system 21. The alignment system 26 projects (projects) the light beam from the alignment light source 26a onto the cornea Ec as a parallel light beam through the objective lens 21a. The processing unit 17 or the examiner moves the head unit 13 in the front-rear direction based on the bright spot (bright spot image) projected (projected) on the cornea Ec, so that the direction orthogonal to the optical axis of the observation system 21 is obtained. Alignment (vertical direction, horizontal direction) is performed. At this time, the processing unit 17 causes the display screen 16a to display an alignment mark AL serving as a guideline for the alignment mark in addition to the anterior segment image E ′ on which the bright spot image Br is formed. The processing unit 17 may be configured to control to start measurement when the alignment is completed.

  The target projection system 22 (a subjective inspection system 24) includes a display 22a, a half mirror 22b, a relay lens 22c, a reflection mirror 22d, a focusing lens 22e, a relay lens 22f, a field lens 22g, and a variable cross cylinder lens (VCC) 22h. And the reflection mirror 22 i and the dichroic filter 22 j, and the dichroic filter 21 b and the objective lens 21 a are shared with the observation system 21. The subjective examination system 24 has at least two glare light sources 22k that irradiate the eye E with glare light at a position surrounding the optical axis in an optical path different from the optical path leading to the display 22a and the like. The display 22a presents a fixation target 31 (see FIG. 4) or a point target 32 (see FIG. 5) as a visual target to fix the line of sight of the eye E, or eye characteristics (eyesight) of the eye E to be examined. A subjective examination target (see reference numeral 22z in FIG. 8) for subjective examination of values and correction powers (distance power, near power, etc.). The fixation target 31 is a visual target to be presented to the subject for fixation, and is a pattern having a visual angle of a certain level or more that allows the eye E to clearly recognize a focus shift (blurring condition) (see FIG. 4). In the first embodiment, the fixation target 31 is a landscape target that includes a portion that is easy to gaze and can naturally be viewed from a distance (see FIG. 4). The point-like target 32 is a target having a smaller viewing angle than the fixation target 31 indicating the optical axis of the target projection system 22, and in the first embodiment, the background (portion surrounding the target) is dark (one side is black). State) is a symbol that has a circular dot shape at the center position (on the optical axis) (see FIG. 5). The fixation target 31 functions as a first target, and the point target 32 functions as a second target having a smaller viewing angle than the first target (fixed target 31). The display 22 a can be formed by an EL (electroluminescence) or liquid crystal display (Liquid Crystal Display (LCD)), and displays an arbitrary image under the control of the processing unit 17. The display 22a is provided movably along the optical axis at a position conjugate with the fundus oculi Ef of the eye E on the optical path of the target projection system 22 (subjective inspection system 24).

  Further, in the target projection system 22 (a subjective inspection system 24), a pinhole plate 22p (its through-hole) is provided at a position that is substantially conjugate with the pupil of the eye E on the optical path. This pinhole plate 22p is formed by providing a through-hole in the plate member, and allows insertion and removal of the target projection system 22 (subjective inspection system 24) into and from the optical path. Then, the through hole is positioned on the optical axis. The pinhole plate 22p is inserted into the optical path in the subjective examination mode, so that it is possible to perform a pinhole test for determining whether or not the eye E can be corrected by the eyeglasses. In the first embodiment, the pinhole plate 22p is provided between the field lens 22g and the VCC 22h, and is inserted and removed under the control of the processing unit 17. The position where the pinhole plate 22p is provided may be provided at a position substantially conjugate with the pupil of the eye E on the optical path, and is not limited to the first embodiment.

  The eye refractive power measurement system 23 detects (receives) a ring-shaped luminous flux projection system 23A that projects a ring-shaped measurement pattern on the fundus oculi Ef of the eye E and a reflected light of the ring-shaped measurement pattern from the fundus oculi Ef. And a ring-shaped light beam receiving system 23B. The ring-shaped luminous flux projection system 23A includes a reflex light source unit 23a, a relay lens 23b, a pupil ring stop 23c, a field lens 23d, a perforated prism 23e, and a rotary prism 23f, and a dichroic filter 22j as a target projection system 22. The dichroic filter 21b and the objective lens 21a are shared with the observation system 21. The reflex light source unit 23a includes a reflex measurement light source 23g for reflex measurement using, for example, an LED, a collimator lens 23h, a conical prism 23i, and a ring pattern forming plate 23j, which are refracted by the eye under the control of the processing unit 17. It is possible to move integrally on the optical axis of the force measurement system 23.

  The ring-shaped light beam receiving system 23B includes a hole 23p of a perforated prism 23e, a field lens 23q, a reflection mirror 23r, a relay lens 23s, a focusing lens 23t, and a reflection mirror 23u, and includes an objective lens 21a, a dichroic filter 21b, The dichroic filter 21e, the imaging lens 21f, and the imaging device 21g are shared with the observation system 21, the dichroic filter 22j is shared with the target projection system 22 (a subjective inspection system 24), and the rotary prism 23f and the perforated prism 23e are ring-shaped. Shared beam projection system 23A.

  Next, the operation in the eye refractive power measurement mode will be described. The processing unit 17 turns on the reflex measurement light source 23g, and moves the reflex light source unit 23a of the ring-shaped light beam projection system 23A and the focusing lens 23t of the ring-shaped light beam reception system 23B in the optical axis direction. In the ring-shaped luminous flux projection system 23A, the reflex light source unit 23a emits a ring-shaped measurement pattern, and the measurement pattern proceeds to the apertured prism 23e via the relay lens 23b, the pupil ring stop 23c, and the field lens 23d, The light is reflected by the reflecting surface 23v and guided to the dichroic filter 22j through the rotary prism 23f. In the ring-shaped luminous flux projection system 23A, the measurement pattern is guided to the objective lens 21a through the dichroic filter 22j and the dichroic filter 21b, thereby projecting the ring-shaped measurement pattern onto the fundus oculi Ef of the eye E to be examined.

  In the ring-shaped light beam receiving system 23B, the ring-shaped measurement pattern formed on the fundus oculi Ef is condensed by the objective lens 21a, and passes through the dichroic filter 21b, the dichroic filter 22j, and the rotary prism 23f, and the hole 23p of the holed prism 23e. Proceed to. In the ring-shaped light beam receiving system 23B, the measurement pattern is passed through the field lens 23q, the reflection mirror 23r, the relay lens 23s, the focusing lens 23t, the reflection mirror 23u, the dichroic filter 21e, and the imaging lens 21f, thereby obtaining the imaging element 21g. To form an image. Thereby, the image sensor 21g detects an image of the ring-shaped measurement pattern, and the processing unit 17 displays the image of the measurement pattern on the display screen 16a, and based on the image (image signal from the image sensor 21g). The spherical power, the cylindrical power, and the shaft angle as the eye refractive power are measured by a known method.

  Further, in the eye refractive power measurement mode, the processing unit 17 causes the display 22a to be turned on and display the fixation target 31 (see FIG. 4) in the target projection system 22. In the target projection system 22, the light flux of the fixation target 31 from the display 22a is converted into a half mirror 22b, a relay lens 22c, a reflection mirror 22d, a focusing lens 22e, a relay lens 22f, a field lens 22g, a VCC 22h, and a reflection mirror 22i. The light is projected (projected) onto the fundus oculi Ef of the eye E through the dichroic filter 22j, the dichroic filter 21b, and the objective lens 21a. The examiner or the processing unit 17 performs alignment in a state in which the fixation target 31 is fixed to the subject, and moves to the far point of the eye E based on the result of temporary measurement of eye refractive power (ref). After the focusing lens 22e is moved, the eye refractive power during adjustment suspension is measured in a cloudy state.

  Next, the operation in the subjective examination mode will be described. In the subjective examination system 24, the processing unit 17 turns on the display 22a to display a target according to the measurement content, and focuses on a position that matches the eye refractive power of the eye E measured in the eye refractive power measurement mode. The lens 22e is moved, and VCC22h is set to a posture for correcting the astigmatism state of the eye E measured in the eye refractive power measurement mode. In the subjective examination system 24, the luminous flux of the target from the display 22 a is projected (projected) onto the fundus oculi Ef of the eye E as in the case of the luminous flux of the fixation target 31. The examiner or the processing unit 17 asks the subject how to look at the presented index, and determines the prescription value by repeating the selection of the target according to the response and the question. In the subjective examination mode, when performing a glare examination (glare test), the subjective examination is performed by turning on the glare light source 22k under the control of the processing unit 17.

  It should be noted that the configuration of the eye refractive power measurement system 23, the subjective examination system 24, the alignment system 25, the alignment system 26, the kerato system 27, and the like, the measurement principle of the eye refractive power (ref), subjective examination, and corneal shape (kerato), etc. Is well known and will not be described in detail.

  In the ophthalmologic apparatus 10 according to the present invention, when measuring the corneal shape (kerato) with the kerato system 27, the processing unit 17 uses the point-like target 32 (see FIG. 5) having a small visual angle on the display 22a of the target projection system 22. Display. The target projection system 22 projects (projects) the light beam of the point-like target 32 from the display 22a onto the fundus oculi Ef of the eye E as in the case of the light beam of the fixation target 31 or the like. The examiner or the processing unit 17 performs alignment in a state where the subject gazes (fixes) the pointed target 32 and then measures the corneal shape using the kerato system 27.

  As described above, in the ophthalmologic apparatus 10 according to the present invention, when measuring the corneal shape in the target projection system 22, the point target 32 (see FIG. 5) having a small viewing angle is presented and the eye refractive power is measured. In doing so, the fixation target 31 (see FIG. 4) having a large viewing angle is presented. This is due to the following. When measuring the eye refractive power, the eye E is clouded and the refractive power is measured in the adjustment resting state. Therefore, the fixation target 31 has a large viewing angle as in the landscape visual target of Example 1, and is blurred. What is easy to recognize is desirable. On the other hand, when measuring the corneal shape, it is not affected by the adjustment of the eye E to be examined, so adjustment guidance (such as cloud fog) is unnecessary, so recognition of the degree of blurring of the target is unnecessary. It is only necessary that the line of sight of the optometer E can be determined. Here, it is conceivable that the fixation target 31 is also presented in the measurement of the corneal shape, but depending on the eye refractive power (degree of refraction state) of the eye E, the presented fixation target 31 is blurred and fixed. There is a possibility that the central visual target (home in the example of FIG. 4) to be recognized cannot be recognized and the line of sight of the eye E cannot be determined. Although it is conceivable to move the focusing lens 22e to a position that matches the eye refractive power of the eye E, it is common to measure the corneal shape first, and when measuring the corneal shape, The eye refractive power of the eye E is unknown and the focusing lens 22e cannot be moved. On the other hand, in the ophthalmologic apparatus 10 according to the present invention, the point-like visual target 32 is presented when measuring the corneal shape. Unlike the design, this point-like target 32 is shining at one point in the field of view, so that the point-like target 32 (its image) presented due to the eye refractive power of the eye E is blurred. Even if it exists, the position of the point-like visual target 32 is easy to recognize. Therefore, the ophthalmologic apparatus 10 can determine the line of sight of the eye E regardless of the eye refractive power of the eye E by presenting the point target 32 and measuring the corneal shape.

  Next, an eye characteristic measurement process for measuring the eye characteristics (corneal shape and eye refractive power) of the eye E under the control of the processing unit 17 in the ophthalmologic apparatus 10 will be described with reference to FIG. FIG. 6 is a flowchart showing an eye characteristic measurement process (eye characteristic measurement method) executed by the processing unit 17 in the first embodiment. The eye characteristic measurement process is executed by the processing unit 17 based on a program stored in the internal memory 17 a or the storage unit 18 of the processing unit 17. Below, each step (each process) of the flowchart of this FIG. 6 is demonstrated. The flowchart of FIG. 6 is started when an operation for starting measurement of eye characteristics is performed in the ophthalmologic apparatus 10.

  In step S1, a point visual target 32 (see FIG. 5) is presented, and the process proceeds to step S2. In step S <b> 1, the point target 32 is displayed on the display 22 a of the target projection system 22. At this time, in the target projection system 22, the focusing lens 22 e is positioned so as to present the display 22 a (the point target 32 displayed by the target) optically infinitely far from the eye E. (Hereinafter also referred to as 0D position). The focusing lens 22e has a predetermined position on the optical axis of the target projection system 22 so as to present the point target 32 (second target) at a predetermined position regardless of the eye refractive power of the eye E. For example, a position where the point-like target 32 (second target) is optically presented at a finite distance when viewed from the eye E to be examined may be used, and the present invention is not limited to the first embodiment.

  In step S2, following the presentation of the point-like target 32 in step S1, the pinhole plate 22p is inserted, and the process proceeds to step S3. In this step S2, the pinhole plate 22p is inserted into the optical path in the target projection system 22. Note that step S1 and step S2 may be performed first, and are not limited to the order of the first embodiment.

  In step S3, alignment is performed following the insertion of the pinhole plate 22p in step S2, and the process proceeds to step S4. In this step S3, the alignment system 25 performs alignment in the direction along the optical axis of the observation system 21 (front-rear direction), and the alignment system 26 performs alignment in the direction orthogonal to the optical axis (up-down, left-right direction).

  In step S4, following the alignment in step S3, the corneal shape (kerato) is measured, and the process proceeds to step S5. In step S4, the corneal shape is measured as described above using the kerato system 27 and the observation system 21 while fixing the point target 32 formed by the target projection system 22.

  In step S5, following the measurement of the corneal shape in step S4, presentation of the point target 32 is stopped, and the process proceeds to step S6. In step S5, the display 22a of the target projection system 22 is turned off.

  In step S6, following the stop of the presentation of the point visual target 32 in step S5, the pinhole plate 22p is detached, and the process proceeds to step S7. In step S6, the pinhole plate 22p is separated from the optical path in the target projection system 22. Note that step S5 and step S6 may be performed first, and are not limited to the order of the first embodiment.

  In step S7, following the separation of the pinhole plate 22p in step S6, the fixation target 31 (see FIG. 4) is presented, and the process proceeds to step S8. In step S7, the fixation target 31 is displayed on the display 22a of the target projection system 22. At this time, in the target projection system 22, the focusing lens 22e is set to the 0D position.

  In step S8, following the presentation of the fixation target 31 in step S7, the eye refractive power (ref) is provisionally measured, and the process proceeds to step S9. In step S8, the eye refractive power measurement system 23 (ring-shaped light beam projection system 23A and ring-shaped light beam light receiving system 23B) is operated while fixing the fixation target 31, which is a landscape target presented by the target projection system 22. In use, the eye refractive power is temporarily measured as described above. In this temporary measurement, the eye refractive power is measured with the focusing lens 22e as the 0D position regardless of the eye characteristics of the eye E.

  In step S9, following the temporary measurement of the eye refractive power in step S8, the focusing lens 22e is moved to a position suitable for the eye refractive power of the eye E, and the process proceeds to step S10. In this step S9, in the target projection system 22, the focusing lens 22e is positioned at a position suitable for the eye refractive power of the eye E (D (diopter) value obtained by the temporary measurement) acquired by the temporary measurement in step S8. Is moved (conforms to eye refractive power). Thereby, irrespective of the eye refractive power of the eye E, the fixation target 31 formed by the target projection system 22 can be clearly recognized (focused) on the eye E.

  In step S10, following the movement of the focusing lens 22e to the position suitable for the eye refractive power of the eye E in step S9, the process proceeds to step S11 as a cloudy state. In this step S10, in the target projection system 22, the focusing lens 22e is moved from the position suitable for the eye refractive power of the eye E to the positive side of the D (diopter) value by a predetermined amount (+1. Move only 5D). Then, the eye E changes from a state in which the fixation target 31 is clearly visually recognized (in focus) to a cloudy state in which the fixation target 31 cannot be focused.

  In step S11, following the clouding state in step S10, the eye refractive power (ref) is actually measured, and this eye characteristic measurement process is terminated. In step S11, the eye refractive power is actually measured as described above using the eye refractive power measurement system 23 (ring-shaped light beam projection system 23A and ring-shaped light beam light receiving system 23B) in the cloudy state in step S10. In this main measurement, the eye refractive power is measured from the state in which the fixation target 31 is visually recognized by the eye E to the adjustment resting state by the guidance of the adjustment with cloud fog.

  Thus, the ophthalmologic apparatus 10 measures the corneal shape and the eye refractive power of the eye E to be examined by performing the eye characteristic measurement process. In this ophthalmologic apparatus 10, when measuring the corneal shape (kerato), the target projection system 22 presents the point target 32 (see FIG. 5), so the point eye regardless of the eye refractive power of the eye E to be examined. The position of the visual target 32 can be appropriately recognized, and the line of sight of the eye E can be determined by fixing the point visual target 32. In the ophthalmologic apparatus 10, when the eye refractive power (ref) is measured, the target projection system 22 presents the fixation target 31 (see FIG. 5), so that it is easy to recognize the blur of the target. By fixing the fixation target 31, the line of sight can be determined while guiding the adjustment of the eye E to be examined.

  In the ophthalmologic apparatus 10 as an embodiment of the ophthalmologic apparatus according to the present invention, the optotype projection system 22 presents a second visual target (point-like visual target 32) having a small visual angle on the optical axis and a large visual angle. Switching between presenting one target (fixed target 31) is possible. For this reason, the ophthalmologic apparatus 10 can present a second visual target (dotted visual target 32) having a small visual angle in a scene where adjustment guidance is unnecessary and the line of sight is desired to be aligned with the measurement optical axis of the visual target projection system 22. In a scene that requires adjustment guidance such as force measurement, the first visual target (fixed target 31) having a large visual angle can be presented. Thereby, in the ophthalmologic apparatus 10, the eye E to be examined is more appropriately fixed by switching the visual target (dotted visual target 32 or the fixed visual target 31) to be presented according to the scene, that is, the visual angle (the size). The eye characteristics of the eye E can be measured more appropriately.

  Further, in the ophthalmologic apparatus 10, when the eye E (its corneal shape) is measured by the second measurement system (kerato system 27) in the target projection system 22, the second target (dotted target) having a small visual angle. 32) is presented. For this reason, the ophthalmologic apparatus 10 presents the second target (point target 32) even when the corneal shape is measured in a state where the eye refractive power of the eye E is not known. Even when the second visual target (point target 32) cannot be clearly adjusted, the position of the second target (point target 32) can be recognized. In particular, the ophthalmologic apparatus 10 presents the second target (point target 32) at the 0D position when measuring the corneal shape, but the second target is also applied to the eye E that cannot be adjusted to 0D. Since the position of the (point-like visual target 32) can be recognized, the line of sight of all the eye E can be fixed appropriately. Thereby, in the ophthalmologic apparatus 10, the cornea shape of the eye E to be examined can be measured appropriately.

  Further, in the ophthalmologic apparatus 10, when the eye E (its eye refractive power) is measured by the first measurement system (eye refractive power measurement system 23) in the target projection system 22, the first visual target having a large visual angle (the eye refractive power). A fixation target 31) is presented. For this reason, in the ophthalmologic apparatus 10, adjustment can be firmly guided by presenting the first visual target (fixation target 31), and the eye E can be appropriately fixed. In particular, in the ophthalmologic apparatus 10, when measuring the eye refractive power of the eye E, the cloud is fogged after the first target (fixed target 31) is presented at a position that matches the eye refractive power of the eye E. Since the cloud state is set after the state is clearly recognized, the eye E can be appropriately guided to the adjustment pause state. Thereby, the ophthalmologic apparatus 10 can appropriately measure the eye refractive power of the eye E.

  In the ophthalmologic apparatus 10, the target projection system 22 is provided with a pinhole plate 22 p that can be inserted and removed at a position conjugate with the pupil of the eye E to be examined. Therefore, in the ophthalmologic apparatus 10, a pinhole test can be performed in the subjective examination, and even if the eye E is not orthographic by inserting the pinhole plate 22p to increase the depth of focus, The recognition of the sight target 32 and the fixation target 31) is facilitated. In particular, the ophthalmologic apparatus 10 inserts the pinhole plate 22p when presenting the second visual target (dotted visual target 32) having a small viewing angle, so that the second visual target (regardless of the eye refractive power of the eye E) ( The point target 32) can be recognized more appropriately. Further, in the ophthalmologic apparatus 10, since the pinhole plate 22p is removed when the first visual target (fixed visual target 31) having a large viewing angle is presented, it is presented at a position suitable for the eye refractive power of the eye E to be examined. It is possible to prevent the blurring of one target (fixed target 31) from being obstructed. This is because when the pinhole plate 22p is inserted, it becomes difficult to recognize the blur even if the depth of focus becomes deep and the focus is slightly shifted. Thereby, in the ophthalmologic apparatus 10, the cornea shape and eye refractive power of the eye E to be examined can be measured more appropriately.

  In the ophthalmologic apparatus 10, in the target projection system 22, an optical path for presenting a first target with a large viewing angle (fixed target 31) and an optical path for presenting a second target with a small viewing angle (dotted target 32) , Let me share. For this reason, the ophthalmologic apparatus 10 can switch the target to be presented (the point-like target 32 or the fixation target 31), that is, the viewing angle (its size) while downsizing.

  In the ophthalmologic apparatus 10, in the target projection system 22, a display 22 a is provided at a position conjugate with the fundus oculi Ef of the eye E to be examined, and the first target (fixed target 31) having a large viewing angle by switching the display on the display 22 a and A second visual target (dotted visual target 32) having a small visual angle is presented. Therefore, the ophthalmologic apparatus 10 can switch the presentation between the first target (fixed target 31) and the second target (point-like target 32) with a single optical path, and is small in size with a simple configuration. Can be

  In the ophthalmologic apparatus 10, in the target projection system 22, the first target having a large viewing angle to be presented is a fixation target 31, and the second target having a small viewing angle to be presented is a point target 32. For this reason, the ophthalmologic apparatus 10 can recognize the focus shift (blurring condition) more clearly by presenting the fixation target 31 as the first visual target having a large viewing angle. Further, the ophthalmologic apparatus 10 presents the point target 32 as the second target having a small viewing angle, so that the position of the point target 32 can be determined even when the point target 32 is blurred. It can be made easier to recognize.

  In the ophthalmologic apparatus 10, since the background of the point target 32 as the second target having a small viewing angle presented by the target projection system 22 is dark, the contrast between the point target 32 and the background can be increased. Therefore, even when the point-like target 32 presented due to the refractive power of the eye E is blurred, the position of the point-like target 32 can be recognized more appropriately and easily.

  In the ophthalmologic apparatus 10, since the target projection system 22 can present a subjective examination target for subjective measurement of the eye characteristic of the eye E, the eye characteristic of the eye E can be reduced while reducing the size with a simple configuration. It can be measured objectively and subjectively.

  Therefore, in the ophthalmologic apparatus 10 as an embodiment of the ophthalmologic apparatus according to the present invention, even if the measurement value in the first measurement system (eye refractive power in the first embodiment) is not grasped, measurement by the second measurement system ( In Example 1, the corneal shape) can be appropriately executed. For this reason, in the ophthalmologic apparatus 10, the measurement (cornea) is quickly performed without moving the moving lens 22e regardless of whether the measurement value (eye refractive power) in the first measurement system is known. Shape).

  Next, an ophthalmologic apparatus 10A as an ophthalmologic apparatus according to Embodiment 2 of the present invention will be described with reference to FIGS. The ophthalmologic apparatus 10A according to the second embodiment has a configuration in which the fixation target 31 (first target) and the point target 32 (second target) in the target projection system 22A are presented. This is an example different from 10. Since the basic configuration and operation of the ophthalmic apparatus 10A according to the second embodiment are the same as those of the ophthalmic apparatus 10 according to the first embodiment, the same reference numerals are given to portions having the same configuration, and detailed description thereof is omitted. To do. In addition, in FIG. 8, although the turret board 22u is shown typically, it does not necessarily correspond with an actual aspect.

  In the ophthalmic apparatus 10A according to the second embodiment, as shown in FIG. 7, in the target projection system 22A, instead of the display 22a, an LED light source 22q that generates white light, a color correction filter 22r, a collimator lens 22s, and a turret unit 22t. And provide. The turret unit 22t switches the target projected by the target projection system 22A onto the fundus oculi Ef of the eye E (presented on the eye E). In the second embodiment, the turret unit 22t and the switching drive unit 22v Have The turret plate 22u is provided so as to be rotatable about the rotation shaft 22w, supports a plurality of targets when viewed in the rotation direction, and views any one of the targets according to the rotation posture. By being present at a position conjugate with the fundus oculi Ef of the eye E to be examined on the optical axis of the target projection system 22A, it is presented to the eye E to coincide with the optical axis. The switching drive unit 22v rotates the turret plate 22u via the rotation shaft 22w, and changes the rotation posture of the turret plate 22u.

  In the second embodiment, as shown in FIG. 8, the turret plate 22u supports a landscape chart 22x, a dotted chart 22y, and various subjective examination charts 22z as targets. The landscape chart 22x is a pattern that forms a fixation target 31 (see FIG. 4), which is a landscape target, and the dotted chart 22y is a small circular circle that forms a dotted target 32 (see FIG. 5). It is an opening. For this reason, the landscape chart 22x functions as a first target chart that forms the first target (fixed target 31), and the dotted chart 22y forms the second target (pointed target 32). It functions as a second target chart. The subjective examination chart 22z is a pattern that forms an optometric chart as a subjective examination target for measuring the eye characteristic (optical characteristic) of the eye E by asking the subject how to look (subjective examination). is there. In the turret plate 22u, as an example, the subjective examination chart 22z located next to the landscape chart 22x is used as a visual acuity chart for visual examination. Examples of other subjective examination charts 22z include a vision test chart, for example, a polarized red green (R & D) test chart, a precise stereoscopic test chart, a stereoscopic test chart, a cross oblique test chart, and an unequal image test chart. A convolutional tilt test chart is provided as appropriate.

  The LED light source 22q and the switching drive unit 22v of the turret unit 22t are connected to the processing unit 17. Under the control of the processing unit 17, the LED light source 22q is appropriately turned on, and any one of the targets is positioned on the optical axis of the target projection system 22A by driving the switching drive unit 22v. In the target projection system 22A, the light (light beam) emitted from the LED light source 22q and corrected by the color correction filter 22r passes through the target positioned on the optical axis of the turret plate 22u, thereby The visual target is presented on the fundus oculi Ef of the eye E to be examined. In this ophthalmologic apparatus 10A, when the landscape chart 22x is positioned on the optical axis by controlling the rotation posture of the turret unit 22t in the target projection system 22A, the fixation target 31 (see FIG. 4) is presented, When the chart 22y is positioned on the optical axis, a point-like target 32 (see FIG. 5) is presented.

  Since the ophthalmologic apparatus 10A according to the second embodiment has basically the same configuration as that of the ophthalmologic apparatus 10 according to the first embodiment, basically the same effects as those in the first embodiment can be obtained.

  In addition, in the ophthalmologic apparatus 10A according to the second embodiment, the first target (fixed target 31) and the second target (point-like target 32) are displayed only by changing the rotational posture of the turret unit 22t. And can be switched. Therefore, in the ophthalmologic apparatus 10A, it is possible to switch the presentation between the first target (fixed target 31) and the second target (point target 32) with a single optical path, and with a simple configuration. It can be downsized.

  Further, in the ophthalmologic apparatus 10A, if the conventional configuration has the turret portion 22t to present the fixation target 31 and the subjective examination chart 22z, the dot chart 22y (second target chart) is provided on the turret plate 22u. ), And it is possible to switch the presentation between the first target (fixed target 31) and the second target (point target 32) with minimal design changes from the conventional configuration. Can be.

  Therefore, in the ophthalmologic apparatus 10A of the second embodiment as the ophthalmologic apparatus according to the present invention, even if the measurement value in the first measurement system (eye refractive power in the second embodiment) is not grasped, the measurement by the second measurement system ( In Example 2, the corneal shape) can be appropriately executed.

  Next, an ophthalmologic apparatus 10B as an ophthalmologic apparatus according to Embodiment 3 of the present invention will be described with reference to FIG. The ophthalmologic apparatus 10B according to the third embodiment is configured to present the fixation target 31 (first target) and the point-like target 32 (second target) in the target projection system 22B. 10 and an ophthalmic apparatus 10A of the second embodiment. Since the basic configuration and operation of the ophthalmologic apparatus 10B according to the third embodiment are the same as those of the ophthalmologic apparatus 10A according to the second embodiment described above, the same reference numerals are given to portions having the same configuration, and detailed description thereof is omitted. To do.

  In the ophthalmologic apparatus 10B of the third embodiment, as shown in FIG. 9, in the target projection system 22B, as in the second embodiment, instead of the display 22a, an LED light source 22q, a color correction filter 22r, a collimator lens 22s, and a turret. Part 22tB. The turret portion 22tB has basically the same configuration as the turret portion 22t of the second embodiment, but unlike the turret plate 22u, the turret plate 22uB is not provided with the dotted chart 22y (see FIG. 8). Then, in the target projection system 22B, the optical path leading to each glare light source 22k branched from the optical path leading to the turret part 22tB and the like for presentation of the fixation target 31 (see FIG. 4) is defined as the branched optical path 22m. A point light source 22n is provided at a position conjugate with the fundus oculi Ef of the eye E to be examined at 22m.

  The point light source 22n is provided on the optical axis of the branch optical path 22m, is located at the center of each glare light source 22k surrounding the optical axis, is connected to the processing unit 17, and is appropriately turned on under the control of the processing unit 17. . In the target projection system 22B, when the point light source 22n is turned on, the light (light beam) from the point light source 22n is converted into a half mirror 22b, a relay lens 22c, a reflection mirror 22d, a focusing lens 22e, a relay lens 22f, and a field lens 22g. , VCC 22h, reflecting mirror 22i, dichroic filter 22j, dichroic filter 21b, and objective lens 21a, and presented to the fundus oculi Ef of the eye E to be examined. In this ophthalmologic apparatus 10B, when the LED light source 22q is turned on while the landscape chart 22x is positioned on the optical axis in the target projection system 22B by controlling the rotation posture of the turret unit 22tB, the fixation target 31 (see FIG. 4). When the point light source 22n is turned on, a point visual target 32 (see FIG. 5) is presented. For this reason, the point light source 22n functions as a second target light source that forms a second target (point target 32).

  The ophthalmic apparatus 10B according to the third embodiment basically has the same configuration as that of the ophthalmic apparatus 10A according to the second embodiment, and thus basically the same effects as those in the second embodiment can be obtained.

  In addition, in the ophthalmologic apparatus 10B according to the third embodiment, the first target (fixed target 31) is presented and the second target (the point target 32) is simply switched between the lighting of the LED light source 22q and the point light source 22n. ) Can be switched. For this reason, in the ophthalmologic apparatus 10B, it is possible to switch between the presentation of the first target (fixed target 31) and the second target (point-like target 32) with a single optical path, and a small size with a simple configuration. Can be

  Further, in the ophthalmologic apparatus 10B, if the conventional configuration has each glare light source 22k in the branched optical path 22m branched from the optical path leading to the turret portion 22tB and the like for presentation of the fixation target 31 (see FIG. 4). It is only necessary to provide a point light source 22n (second target light source) on the optical axis of the branch optical path 22m, and the first target (fixed target 31) with minimal design changes from the conventional configuration. And the second visual target (dotted visual target 32) can be switched.

  Therefore, in the ophthalmologic apparatus 10B according to the third embodiment as the ophthalmologic apparatus according to the present invention, even if the measurement value (eye refractive power in the third embodiment) is not grasped, measurement by the second measurement system ( In Example 3, the corneal shape) can be appropriately executed.

  In the ophthalmologic apparatus 10B according to the third embodiment, the point light source 22n (second target light source) is provided at the center of each glare light source 22k, but depending on the size of each glare light source 22k (the center) ) May not be able to secure a space for providing the point light source 22n. In this case, as shown in FIG. 10, a point light source 22n is provided behind each glare light source 22k (a position away from the half mirror 22b), and a light guide member 33 is provided so as to face the emission surface 22na. Also good. This is because the point light source 22n requires a smaller amount of light than the glare light source 22k. The light guide member 33 can be configured using a columnar member made of a transparent resin material, an optical fiber, or the like. In the example shown in FIG. 10, each glare light source 22 k is provided on the substrate 34, and the light guide member 33 is passed through a through hole 34 a provided on the substrate 34. Even with such a configuration, it is possible to present the point-like visual target 32 via the light guide member 33 while enabling a glare inspection (glare test) using each glare light source 22k.

  In each of the above-described embodiments, the ophthalmologic apparatuses 10, 10A, and 10B as the embodiments of the ophthalmologic apparatus according to the present invention have been described. However, the target projection system that presents the target to the eye to be examined, and the eye to be examined A first measurement system that projects a light beam onto the fundus of the subject and receives reflected light from the fundus of the subject's eye, and projects a light beam onto the anterior eye portion of the subject's eye and reflects the reflected light from the anterior eye portion A second measurement system that acquires information on the anterior eye part; and a processing unit that executes measurement processing by the first measurement system and the second measurement system. In addition, any ophthalmologic apparatus that switches between the first visual target and the second visual target having a smaller viewing angle than the first visual target may be used, and the present invention is not limited to the above-described embodiments.

  In each of the above-described embodiments, the target projection systems 22, 22 </ b> A, and 22 </ b> B are configured as described above. However, the brightness of the point-like target 32 (second target) may be adjusted. In that case, for example, the luminance of the display 22a may be changed in the ophthalmic apparatus 10 of the first embodiment, the luminance of the LED light source 22q may be changed in the ophthalmic apparatus 10A of the second embodiment, and the ophthalmic apparatus 10B of the third embodiment. What is necessary is just to change the brightness | luminance of the point light source 22n. In the case of such a configuration, when the pinhole plate 22p is inserted, the luminance of the point target 32 is increased, so that the point target 32 (the position indicated by the point target) can be easily recognized. This is because when the pinhole plate 22p is inserted, the amount of light is reduced, and the point-like visual target 32 becomes dark. For this reason, with such a configuration, the position of the punctiform visual target 32 can be more appropriately recognized even for the subject's eye E that is not normal, and the corneal shape of the subject's eye E can be measured more appropriately. .

  Further, in each of the above-described embodiments, the target projection systems 22, 22A, and 22B are configured as described above, but the first target (fixed target 31) having a large visual angle and the second visual field having a small visual angle are set on the eye E. Any other form may be used as long as the mark (point-like visual target 32) is presented so as to be switchable, and the present invention is not limited to the above-described embodiments. At that time, the display 22a, the turret part 22tB (landscape chart 22x, the dot chart 22y), and the point light source 22n may be provided at other positions as long as they are conjugate with the fundus oculi Ef of the eye E, as described above. It is not limited to each example.

  In each of the above-described embodiments, the fixation target 31 is presented as the first visual target. However, any visual target having a large visual angle can be used as long as it can clearly recognize a focus shift (blurring condition). The embodiments are not limited to the above-described embodiments.

  In each of the above-described embodiments, the point target 32 is presented as the second target. However, even if the second target is blurred, the position of the second target can be easily recognized. It can be any target that can be made and has a small viewing angle, and is not limited to the above-described embodiments.

  In each of the above-described embodiments, the eye refractive power measurement system 23 as the first measurement system is configured as described above. However, the light beam is projected onto the fundus oculi Ef of the eye E and the reflected light from the fundus oculi Ef is received. However, other embodiments may be used as long as the measurement is performed by inducing the adjustment of the eye E, and is not limited to the above-described embodiments. The first measurement system is more preferably an eye refractive power measurement system that measures eye refractive power while making the eye E to be examined fixed and clouded.

  In each of the above-described embodiments, the kerato system 27 as the second measurement system has the above-described configuration, but the light beam is projected onto the anterior eye part of the eye E and the anterior eye part is reflected from the reflected light from the anterior eye part. As long as the information is obtained and measurement that does not affect the adjustment of the eye E is performed, other modes may be used, and the present invention is not limited to the above-described embodiments. This second measurement system is more preferably a corneal shape measurement system that measures the corneal shape while fixing the eye E to be examined.

  In each of the above-described embodiments, the pinhole plate 22p is inserted on the optical path when the point target 32 is presented in the target projection systems 22, 22A, 22B. However, the pinhole plate 22p is not inserted. The point target 32 may be presented and is not limited to the above-described embodiments. Whether the point-like target 32 is presented without inserting the pinhole plate 22p, or the position of the point-like target 32 is recognized even when it is blurred due to the eye refractive power of the eye E to be examined. The eye E can be fixed.

  In each of the above-described embodiments, the target projection systems 22, 22 </ b> A, and 22 </ b> B can present a subjective examination target for subjectively measuring the eye characteristics of the eye E, but the eye E has a large viewing angle. Other modes may be used as long as they can switch between one target (fixed target 31) and a second target (point-like target 32) having a small viewing angle, and are not limited to the above-described embodiments. .

  As mentioned above, although the ophthalmologic apparatus of this invention has been demonstrated based on each Example, about a specific structure, it is not restricted to each Example, Unless it deviates from the summary of this invention, a design change, an addition, etc. Permissible.

DESCRIPTION OF SYMBOLS 10 Ophthalmology apparatus 17 Processing part 22, 22A, 22B Target projection system 22a Display 22k Glare light source 22m Branching optical path 22n Point light source (as an example of 2nd target light source) 22p Pinhole board 22t Turret part 22x (1st target) Landscape chart 22y (as an example of a chart) 22y Point chart (as an example of a second target chart) 23 Eye refractive power measurement system (as an example of a first measurement system) 27 (Cornea shape measurement as a second measurement system) Kerat system 31 (as an example of a system) 31 Fixation target (as an example of a landscape target as a first target) 32 Point target (as an example of a second target) E Eye to be examined

Claims (17)

A target projection system for presenting a target to the eye to be examined, a first measurement system for projecting a light beam onto the fundus of the eye to be examined and receiving reflected light from the fundus of the eye to be examined, and the anterior eye of the eye to be examined A measurement process is executed by a second measurement system that projects a light beam onto the part and acquires information on the anterior eye part from reflected light from the anterior eye part, and the first measurement system and the second measurement system. A processing unit,
In the target projection system, the first eye and a second target having a smaller viewing angle than the first target are switched and presented to the eye to be examined .
The target projection system has a pinhole plate that can be inserted and removed at a position substantially conjugate with the pupil of the eye to be examined;
The ophthalmologic projection system includes inserting the pinhole plate when presenting the second visual target and removing the pinhole plate when presenting the first visual target. apparatus. In the visual target projection system, when inserting the pin hole plate ophthalmologic apparatus according to claim 1, characterized in Rukoto enhance the brightness of the second target. In the visual target projection system, wherein the time of measuring the first measurement system presents the first target, characterized that you presenting the second target is when measured by the second measuring system The ophthalmologic apparatus according to claim 1 or 2. The first measurement system is an eye refractive power measurement system that measures the eye refractive power of the eye to be examined.
The second measurement system, ophthalmic device of claim 3, wherein the corneal shape measuring system der Rukoto for measuring the corneal shape of the eye to be examined. The target projection system presents the second target on the optical axis when measured by the corneal shape measurement system, and the eye refractive power of the eye to be examined when measured by the eye refractive power measurement system. The ophthalmologic apparatus according to claim 4 , wherein the first target is presented in a cloudy state after presenting the first visual target in a state adapted to the above . The said target projection system shares the optical path which presents said 1st target, and the optical path which presents said 2nd target, It is any one of Claims 1-5 characterized by the above-mentioned. Ophthalmic equipment. In the visual target projection system, provided the available display changes the display contents on the optical axis, in claim 6, wherein the switching Rukoto display of the display between the second target and said first target The ophthalmic device described. The target projection system includes a rotatable turret unit provided with a first target chart that forms the first target and a second target chart that forms the second target.
The turret section, by changing the rotational orientation, according to claim 6, characterized in Rukoto positions the first target chart or the second target chart on the optical axis of the visual target projection system Ophthalmic equipment. In the target projection system, a first target chart for forming the first target is provided at a position conjugate with the fundus of the eye to be examined, and a branch optical path branched from an optical path to the first target chart Providing a second target light source for forming the second target at a position conjugate with the fundus of the subject eye;
The branch in the optical path, provided at least two glare light sources at positions surrounding the optical axis, ophthalmic device of claim 6 wherein the second target source during each glare light source characterized that you position. A target projection system for presenting a target to the eye to be examined, a first measurement system for projecting a light beam onto the fundus of the eye to be examined and receiving reflected light from the fundus of the eye to be examined, and the anterior eye of the eye to be examined A measurement process is executed by a second measurement system that projects a light beam onto the part and acquires information on the anterior eye part from reflected light from the anterior eye part, and the first measurement system and the second measurement system. A processing unit,
In the target projection system , the first eye and a second target having a smaller viewing angle than the first target are switched and presented to the eye to be examined.
In the target projection system, the optical path for presenting the first target and the optical path for presenting the second target are shared.
In the target projection system, a first target chart for forming the first target is provided at a position conjugate with the fundus of the eye to be examined, and a branch optical path branched from an optical path to the first target chart Providing a second target light source for forming the second target at a position conjugate with the fundus of the subject eye;
Wherein the branched light path, provided at least two glare light sources at positions surrounding the optical axis, the ophthalmic device and the second target light source characterized that you located between the glare source. The target projection system presents the first target when measuring with the first measurement system, and presents the second target when measuring with the second measurement system. The ophthalmic apparatus according to claim 10 . The first measurement system is an eye refractive power measurement system that measures the eye refractive power of the eye to be examined.
The ophthalmologic apparatus according to claim 11 , wherein the second measurement system is a corneal shape measurement system that measures a corneal shape of the eye to be examined . The target projection system presents the second target on the optical axis when measured by the corneal shape measurement system, and the eye refractive power of the eye to be examined when measured by the eye refractive power measurement system. The ophthalmologic apparatus according to claim 12 , wherein the first target is presented in a cloudy state after being presented in a state that conforms to In the visual target projection system, ophthalmic according the any one of claims 13 claim 10, characterized in Rukoto that having a insertion and removable pinhole plate pupil substantially conjugate position of the eye apparatus. The first target is a landscape target;
The ophthalmologic apparatus according to any one of claims 1 to 14, wherein the second visual target is a point-like visual target. The ophthalmologic apparatus according to claim 15, wherein in the target projection system, a background of the point target is dark. The said target | projection projection system can show the subjective test | inspection target for measuring the eye characteristic of the said to-be-tested eye subjectively, The any one of Claims 1-16 characterized by the above-mentioned. Ophthalmic equipment.