JP2018143571A - Optometry apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optometry apparatus which allows a subject to easily discriminate two or more targets.SOLUTION: The optometry apparatus includes a light beam splitting member 49 which splits a light beam for projecting a first target image into two or more light beams each with a different axis angle, the optometry apparatus comprising: first target projection means 7 for projecting two or more first target images, in a separated state, onto a subject eye; second target projection means 6 for projecting two or more second target images, which respectively correspond to the two or more first target images, onto the subject eye; and a controller 57 for controlling the first target projection means 7 and the second target projection means 6. The controller 57 presents the first target images and the second target images to the subject eye simultaneously such that the first target images are discriminable based on the second target images.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optometry apparatus that measures the refractive power of an eye to be examined, particularly the presence or absence of astigmatism and the axial angle of astigmatism.

  Conventionally, an eye function such as refractive power (eye refractive power) of an eye to be examined is measured by subjective examination, objective examination, or a combination of subjective examination and objective examination. The subjective examination measures eye refractive power based on the response of the subject to various targets such as the Landolt ring. The objective test is to measure the eye refractive power mechanically without causing the subject to respond. The subjective test requires time for measurement, and the objective test can be measured in a short time, but the result of the objective test does not necessarily match the result of the subjective test. Therefore, the subjective test is often performed based on the result of the objective test.

  In the measurement of eye refractive power, in the subjective examination for examining astigmatism, the eye refractive power is mainly measured by a cross cylinder (hereinafter referred to as CC) test. The CC test measures the presence / absence of astigmatism (astigmatism amount) and the axis angle of astigmatism, with the CC lens (astigmatism lens) alternately inverted while presenting a target such as a point cloud on the eye to be examined, Inspect which is more clearly visible when the axis of the CC lens is rotated 90 °.

  In the CC test described above, since the target images that pass through the CC lens are alternately presented, the two target images cannot be compared simultaneously. In addition, since it is necessary to repeatedly present the visual target image, the examiner cannot determine which visual target image, which may cause confusion. Therefore, it takes time for the measurement and leads to an increase in the burden on the examiner and the subject.

  One that can compare two target images at the same time is one in which a prism is combined with a CC lens so that two target images having an axial angle of 90 ° can be observed simultaneously. By using a CC lens with a prism, the inspection time can be shortened. However, in the case of a CC lens with a prism, two target images arranged along the astigmatic axis rotate integrally with the prism, and the two target images are not necessarily aligned in the horizontal direction and the vertical direction. Therefore, the subject cannot answer accurately, and the subject's answer may not be accurately transmitted to the examiner, which places a heavy burden on the examiner and the subject.

  In addition, it is also conceivable that only the outer peripheral portion of the prism-equipped CC lens is colored with transparent red and green, and which target image is answered based on the colored color. When placed at a position conjugate or substantially conjugate with the pupil of the subject, the light beam that has passed through the colored portion on the outer periphery of the prism-equipped CC lens does not enter the subject's eye, and the color that is colored on the outer peripheral portion of the prism-equipped CC lens It is difficult to recognize.

JP 2004-180955 A JP-A 64-20825

  The present invention provides an optometry apparatus that allows a subject to easily identify two or more visual targets.

  The present invention includes a light beam dividing member that divides a light beam for projecting a first visual target image into two or more light beams having different axial angles, and the eye to be examined in a state in which the two or more first visual target images are separated. First target projection means for projecting onto the eye, and second target projection means for projecting two or more second target images corresponding to each of the two or more first target images onto the eye to be examined, A control unit that controls the first target projecting unit and the second target projecting unit, and the control unit identifies the first target image based on the second target image; The present invention relates to an optometry apparatus that is configured to simultaneously present the first visual target image and the second visual target image to the eye to be examined.

  According to the present invention, the first target image is a target image for a cross cylinder test, and the light beam splitting member is a cross cylinder with a prism in which a prism and a cross cylinder are integrated. The present invention relates to an optometry apparatus in which a light beam is divided by a cylinder so as to have different axial angles.

  Further, the present invention relates to an optometry apparatus in which the second visual target image includes any one of numerals, characters, symbols, and colors that can identify each first visual target image.

  The present invention also relates to an optometry apparatus in which the control unit turns off only the second visual target image after a predetermined time has elapsed.

  In the present invention, the second target projecting unit further includes a presentation position changing member, and the control unit moves the presentation position changing member along the optical axis of the second target projecting unit, The present invention relates to an optometry apparatus that presents the second visual target image farther than the display position of the first visual target image.

  Further, the present invention provides the optometry apparatus in which the control unit changes the position where each second target image is presented following the change in the position of each first target image presented to the eye to be examined. It is concerned.

  Furthermore, the present invention relates to an optometry apparatus in which the control unit presents the eye to be examined with only the periphery of the second visual target image being white and the other part being black.

  According to the present invention, there is provided a light beam dividing member that divides a light beam for projecting the first visual target image into two or more light beams having different axial angles, and in a state where the two or more first visual target images are separated. First target projecting means for projecting onto the eye to be examined and second target projecting means for projecting two or more second target images corresponding to each of the two or more first target images onto the eye to be examined And a control unit that controls the first target projecting unit and the second target projecting unit, and the control unit is configured to control the first target image based on the second target image. Since the first visual target image and the second visual target image are simultaneously presented to the eye to be discriminated, the subject can position two or more positions of the first visual target image. Regardless of the relationship, it is only necessary to select the corresponding second target image, which reduces the burden on the subject, suppresses incorrect answers, and shortens the measurement time. It exhibits an excellent effect that it is.

It is an optical arrangement | positioning figure which shows the optical system of the optometry apparatus which concerns on the Example of this invention. It is a flowchart explaining the process process of the cross cylinder test which concerns on the Example of this invention. It is explanatory drawing explaining the effect | action of CC with a prism in the said optical system. (A) is explanatory drawing which shows the optotype image shown to a to-be-examined eye from CC target light projection optical system, (B) shows the optotype image to be shown to the to-be-examined eye from a target light projection optical system. It is explanatory drawing. (A)-(E) is explanatory drawing which shows the specific example of a fixation LCD mark. (A)-(D) are explanatory drawings which show the relationship between CC target image and fixation LCD mark. (A), (B) is explanatory drawing which shows the other example of presentation of CC target image and fixation LCD mark. (A)-(D) are explanatory drawings which show the example of presentation of CC visual target image and fixation LCD mark comprised so that the subject could perform self-measurement. It is explanatory drawing explaining the relationship between the subject at the time of performing a binocular open test | inspection and an optometry apparatus. (A) is explanatory drawing which shows the example of presentation of CC target light projection optical system with respect to the eye to be examined in a binocular open test, (B) is the target light projection with respect to the said test eye It is explanatory drawing which shows the example of presentation of an optical system. (A) is explanatory drawing which shows the example of presentation of CC target light projection optical system with respect to the eye to be examined in the binocular open test, (B) is the target light projection with respect to the said test eye It is explanatory drawing which shows the example of presentation of an optical system. (A) is explanatory drawing which shows the example of presentation of CC target light projection optical system and target light projection optical system with respect to the to-be-inspected eye in a binocular open test, (B) is test | inspection It is explanatory drawing which shows the example of presentation of CC target light projection optical system with respect to the eye to be examined on the side which does not carry out, and a target light projection optical system.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, a schematic configuration of an optometry apparatus according to an embodiment of the present invention will be described.

  The optometry apparatus includes an optometry optical system that measures the refractive power of the right eye and the left eye of the subject. FIG. 1 is a schematic configuration diagram showing an optometry optical system 1 for measuring, for example, the eye refractive power of the right eye. Note that the optometry optical system for measuring the refractive power of the left eye and the like has the same configuration as the optometry optical system 1, and thus the description thereof is omitted.

  The optometry optical system 1 includes an anterior ocular segment observation optical system 2, a pattern light beam projection optical system (measurement optical system) 3, a light receiving optical system (measurement optical system) 4, an XY alignment optical system 5, and a second view. It has a target light projection optical system 6 as a target projection means, and a cross cylinder target light projection optical system (CC target light projection optical system) 7 as a first target projection means. In addition, 10 has shown LED which illuminates the anterior eye part of the eye E to be examined.

  The anterior ocular segment observation optical system 2 is an optical system for photographing the anterior ocular segment for observing the anterior ocular segment of the eye E to be examined. The anterior ocular segment observation optical system 2 has a main optical axis O1, and the objective lens 8, the dichroic mirror 9, the half mirror 11, the relay lenses 12, 13 and the dichroic mirror on the main optical axis O1 from the eye E side. 14, an imaging lens 15 and a CCD 16 (imaging means) are arranged. The anterior ocular segment observation optical system 2 forms an anterior ocular segment image on the imaging surface of the CCD 16 when observing the anterior segment of the eye E to be examined.

  The dichroic mirror 9 and the dichroic mirror 14 transmit only 950 nm infrared light used in the anterior ocular segment observation optical system 2, the XY alignment optical system 5 and the like, for example, visible light, It has an optical characteristic of reflecting near-infrared light of 850 nm used in the pattern light beam projection optical system 3.

  The pattern light beam projection optical system 3 is an optical system that projects a ring-shaped pattern light beam for measuring the eye refractive power of the eye E to be examined. The pattern light beam projection optical system 3 has an optical axis O2, and an LED 17, a collimator lens 18, a conical prism 19, a ring index plate 21, an imaging lens 22, and a pupil stop are directed toward the eye E on the optical axis O2. 23, a field lens 24, a perforated triangular prism 25, a rotatable rotary prism 26, a dichroic mirror 27, the dichroic mirror 9, and the objective lens 8. The optical axis O2 is sequentially deflected to the perforated triangular prism 25, the dichroic mirror 27, and the dichroic mirror 9, and coincides with the main optical axis O1.

  The LED 17 is near-infrared light, and the LED 17, the collimator lens 18, the conical prism 19, and the ring indicator plate 21 are integrally driven forward and backward along the optical axis O 2 by a drive motor (not shown). Is done. Further, a ring-shaped transmission part that transmits the light flux from the LED 17 is formed on one surface of the pupil diaphragm 23 by etching or the like, and the transmission part is in a conjugate or substantially conjugate position with the pupil of the eye E to be examined. Yes. Therefore, a ring-shaped projection image is projected on the pupil of the eye E.

  The dichroic mirror 27 transmits visible light used in the target light projection optical system 6 and the CC target light projection optical system 7 and is used in the near-infrared light used in the pattern light beam projection optical system 3. It has the optical property of reflecting light.

  The light receiving optical system 4 has an optical axis O3, and the objective lens 8, the dichroic mirror 9, the dichroic mirror 27, the rotary prism 26, the perforated triangular prism on the optical axis O3 from the eye E side. 25 holes 25a, field lens 28, mirror 29, relay lens 31, focusing lens 32, mirror 33, dichroic mirror 14, imaging lens 15, and CCD 16 are arranged.

  The optical axis O3 is sequentially deflected to the mirror 29, the dichroic mirror 27, and the dichroic mirror 9, and coincides with the main optical axis O1, and is also sequentially deflected to the mirror 33 and the dichroic mirror 14, and the main optical axis. Matches O1.

  A diaphragm is disposed on the bottom surface of the perforated triangular prism 25, that is, the lower end of the hole portion 25a, and is in a conjugate or substantially conjugate position with the pupil of the eye E to be examined. The focusing lens 32 is driven back and forth along the optical axis O3 by a drive motor (not shown). The focusing lens 32, the LED 17, the collimator lens 18, the conical prism 19, and the ring indicator plate 21 may be configured to move together.

  The XY alignment optical system 5 includes an LED 34, a relay lens 35, and the half mirror 11. The XY alignment optical system 5 has a function of projecting an alignment index light beam toward the eye E and detecting an alignment state in two directions (X-axis direction and Y-axis direction) perpendicular to the main optical axis O1. Yes.

  Although not shown, the optometry optical system 1 projects an alignment index light beam toward the eye E and detects an alignment state in a direction parallel to the main optical axis O1 (Z-axis direction). have. The XY alignment optical system 5 that detects the alignment state in two directions perpendicular to the main optical axis O1 and the Z alignment optical system that detects the alignment state in a direction parallel to the main optical axis O1 constitute an alignment means.

  The target light projection optical system 6 is an optical system that projects a fixation target or the like as a second target in order to fixate or cloud the eye E, and present it on the fundus. The target light projection optical system 6 has an optical axis O4. On the optical axis O4, an optometric target LCD 36, an imaging lens 37, a focusing lens 38 as a presentation position changing member, a relay lens 39, a beam splitter. 41, a field lens 42, a variable cross cylinder (VCC) lens 43, a mirror 44, the dichroic mirror 27, the dichroic mirror 9, and the objective lens 8 are disposed.

  The optical axis O4 is sequentially deflected by the mirror 44 and the dichroic mirror 9, and coincides with the main optical axis O1.

  The eye optotype LCD 36 is a landscape chart that performs fixation and clouding when performing an objective test and a subjective test, as well as an optotype target such as a Landolt ring and an E character target, and a CC target image to be described later. A plurality of targets, etc. for identifying the are displayed.

  The focusing lens 38 is driven back and forth along the optical axis O4 by a drive motor (not shown). By moving the focusing lens 38 toward the eye E, the refractive power can be displaced to the minus side, and by moving the focusing lens 38 away from the eye E, the refractive power Can be displaced to the plus side. Accordingly, by moving the focusing lens 38 forward and backward, the target distance displayed on the optometric target LCD 36 can be changed, that is, the target position of the target image can be changed, and the eye E is fixed. Can be clouded.

  The VCC lens 43 is composed of a cylinder lens having positive and negative refractive powers and having a convex curved surface and a cylinder lens having a concave curved surface. The two cylinder lenses rotate independently about the optical axis O4 by a driving mechanism such as a pulse motor (not shown). The amount of astigmatism can be adjusted by relatively rotating the two cylinder lenses, and the axis of astigmatism can be adjusted by rotating the two cylinder lenses together. Therefore, the VCC lens 43 acts to cancel the astigmatism of the eye E. The VCC lens 43 can generate an astigmatism amount of 0 to 8D on the eye E, for example, and is disposed at a position substantially conjugate with the pupil of the eye E via the objective lens 8.

  The CC target light projection optical system 7 is an optical system that presents a CC target image, which is a first target, on the fundus. The CC target light projection optical system 7 has an optical axis O5, and an LED 45, a diffusing plate 46, a CC target plate 47, an imaging lens 48, and a light beam dividing member facing the eye E on the optical axis O5. As a cross cylinder (CC) lens 49 with a prism, a mirror 51, a relay lens 52, the beam splitter 41, the field lens 42, the VCC lens 43, the mirror 44, the dichroic mirror 27, the dichroic mirror 9, the objective A lens 8 is arranged.

  The optical axis O5 is sequentially deflected by the mirror 51, the beam splitter 41, the mirror 44, and the dichroic mirror 9, and coincides with the main optical axis O1. The beam splitter 41, the field lens 42, the VCC lens 43, the mirror 44, the dichroic mirror 27, the dichroic mirror 9, and the objective lens 8 are used in common with the target light projection optical system 6. The That is, the optical path of the target light projection optical system 6 and the CC target light projection optical system 7 are matched with each other via the beam splitter 41.

  The CC target plate 47 is obtained by drawing a dot target pattern for CC inspection on a glass substrate. White light is emitted from the LED 45, the white light passes through the CC target plate 47, and a CC target image is presented to the eye E to be examined. The diffusion plate 46 is disposed adjacent to the CC target plate 47. Due to the diffusion plate 46, uneven illumination of white light transmitted through the CC target plate 47 is reduced.

  The LED 45, the diffusion plate 46, and the CC target plate 47 are integrally driven forward and backward as a CC target unit along the optical axis O5 by a drive motor (not shown). The presenting distance of the CC visual target image projected from the CC visual target plate 47 can be changed by driving the LED 45, the diffusion plate 46, and the CC visual target plate 47 back and forth.

  The LED 45, the diffusing plate 46, and the CC target plate 47 may be fixed, a focusing lens may be added, and the focusing lens may be driven back and forth along the optical axis O5. Further, instead of the LED 45, the diffusion plate 46, and the CC target plate 47, an LCD may be used similarly to the target light projection optical system 6.

  The prism-equipped CC lens 49 is an integration of a prism and a cross cylinder lens. The prism-equipped CC lens 49 includes prisms 49a and 49b (see FIG. 3) in which a cylinder lens of ± 0.5D, for example, is orthogonal to the optical axis O5 and the generating line is inclined by 45 ° with respect to the optical axis O5. Yes. The CC lens 49 with prism is substantially conjugate with the VCC lens 43 with respect to the relay lens 52, that is, substantially conjugate with the pupil of the eye E to be examined.

  Further, for example, a ring gear 54 is formed around the CC lens 49 with prism. The ring gear 54 meshes with a drive gear 55 formed on the output shaft of the drive motor, and the prism-equipped CC lens 49 is rotated via the drive motor. As the drive motor, a motor that can detect a rotation angle or a motor that rotates in accordance with a drive input value, for example, a pulse motor 56 is used.

  FIG. 3 shows an operation example of the prism-equipped CC lens 49. As shown in FIG. 3, when the light beam of the CC target image 53 from the CC target plate 47 is incident on the CC lens 49 with prism, the light beam is transmitted through the prism 49a and the prism 49b. Is divided into luminous fluxes. The divided light flux is presented as two CC visual target images 53a and 53b having different axial angles by 90 ° in a state separated to the eye E. Therefore, by providing the prism-equipped CC lens 49, it is possible to simultaneously observe the two CC visual target images 53a and 53b whose axial angles are different by 90 °.

  Further, as shown in FIG. 1, the optometry optical system 1 has a control unit 57. The control unit 57 controls light emission and display of the LED 10, the LED 17, the LED 34, the optometry target LCD 36, and the LED 45, and the LED 17, the collimator lens 18, the conical prism 19, and the ring indicator plate 21. The light source unit, the focusing lens 32, the focusing lens 38, the LED 45, the diffusion plate 46, and the CC target plate 47 are controlled to move forward and backward, the VCC lens 43, the prism-equipped CC lens 49. The rotation of the rotary prism 26 is controlled, and the alignment with respect to the eye E is controlled.

  Further, the control unit 57 can change the target position of the optotype target LCD 36 based on the change in the rotation angle of the prism-equipped CC lens 49. That is, the presenting position of the target projected from the optometric target LCD 36 can be changed following the change in the presenting position of the CC target images 53a and 53b with respect to the eye E. The control unit 57 may rotate the CC lens 49 with prism in conjunction with an axial angle generated by the VCC lens 43.

  Further, the control unit 57 calculates the eye refractive power based on the received light signal when the reflected light beam is received by the CCD 16, and performs a subjective test such as a visual acuity test, a red green test, and a CC test. It has become.

  Next, the optometry of the eye E using the optometry apparatus having the optometry optical system 1 will be described. In the following description, the right eye is described as the eye E to be examined. Further, since the left-eye optometry is the same as that for the right eye, the description thereof is omitted.

  First, the subject places his / her chin on a chin rest (not shown) of the optometry apparatus, and places the eye E to be examined at a predetermined position. Further, a fixation target such as a landscape is displayed on the optometry target LCD 36, and a fixation target for fixing the eye E is projected onto the eye E.

  When the fixation is completed, alignment with the eye E is performed. The alignment of the eye E is performed by the XY alignment optical system 5 and the Z alignment optical system (not shown). The LED 34 is turned on, and a light beam for XY alignment is projected onto the eye E through the XY alignment optical system 5. Further, an LED (not shown) is turned on, and a light beam for Z alignment is projected onto the eye E through the Z alignment optical system. Further, the LED 10 is turned on to irradiate the anterior segment of the eye E with illumination light.

  The light beam incident on the eye E from the XY alignment optical system 5, the Z alignment optical system, and the LED 10 is reflected by the cornea. Reflected light from the cornea is imaged on the CCD 16 via the anterior ocular segment observation optical system 2, and a Purkinje image (bright spot), an anterior ocular segment image, and the like are acquired.

  The control unit 57 performs alignment in the XY directions based on the projection image from the LED 34 imaged by the CCD 16 and performs alignment in the Z direction based on the projection image from the LEDs of the Z alignment optical system. The alignment may be performed by the examiner based on a Purkinje image displayed on a display unit (not shown).

  Once alignment is complete, an objective test is performed. First, the LED 17 is turned on, and a ring-shaped light beam that has passed through the transmission part of the pupil stop 23 is projected onto the eye E through the conical prism 19 and the ring indicator plate 21. The ring-shaped light beam is reflected from the fundus of the eye E while the shape is distorted by the eye refractive power of the eye E. The ring-shaped light beam reflected by the fundus is imaged on the CCD 16 via the light receiving optical system 4.

  Based on the shape of the ring image captured by the CCD 16 and the amount of movement of the LED 17, the collimator lens 18, the conical prism 19, the ring indicator plate 21, and the focusing lens 32, the control unit 57 The eye refractive power of E is calculated.

  The objective test is completed by calculating the eye refractive power of the eye E. After completion of the objective test, the subjective test is performed based on the measurement result obtained in the objective test. Note that the method of objective test is not limited to the above method. For example, a small bright spot is projected onto the fundus of the eye E, and the light beam reflected from the fundus is detected as a pattern composed of a ring or a plurality of point images by an optical element arranged in the light receiving path, and the eye refractive power is calculated. It may be a thing.

  Based on the eye refractive power SCA value at the far point obtained from the objective test result, the focusing lens 38 is moved along the optical axis O4 so as to correct the refractive error of the eye E, and each of the VCC 43 Rotate and set the cylinder lens relatively. Further, a visual test (Landolt ring, E-character visual target, etc.) for visual acuity test is displayed on the optometric visual target LCD 36 and presented to the eye E to be examined.

  The subject responds with the cut direction of the presented Landolt ring or the direction of the letter E in the direction of tilt of the oral answer or lever.

  When sufficient visual acuity (for example, visual acuity value of 1.0 or more) cannot be obtained by a response to the visual target for visual acuity inspection, the angles of the focusing lens 38 and the VCC 43 are changed. An astigmatism amount and an axial angle shift can be roughly confirmed even if there is a difference in "appearance" in the meridian direction by presenting a radial target. The CC test shown in the flowchart of FIG. 2 is performed in order to confirm details of the astigmatism amount and the deviation of the shaft angle.

  STEP: 01 to STEP: 04 The CC target unit is moved integrally to a position corresponding to the focusing lens 38. The prism-equipped CC lens 49 rotates in accordance with the axis angle of astigmatism generated by the VCC 43. In the present embodiment, the processing of STEP: 01 and STEP: 02 is omitted because it is performed in advance.

  (Step 05) Next, the LED 45 is turned on. The white light emitted from the LED 45 passes through the CC target plate 47, is divided by the prism-attached CC lens 49, and is separated to the eye E as the CC target images 53a and 53b in the form of separated points. Presented.

  At this time, for example, as shown in FIG. 4 (A), the subject is arranged in a predetermined positional relationship (arranged diagonally in FIG. 4 (A)). , 53b can be confirmed. The angle of arrangement coincides with the rotation angle of the CC lens 49 with prism, that is, the axial angle of the eye E to be examined. The CC visual target images 53a and 53b are shown in a blurred state due to the influence of the CC lens 49 with prism. By comparing the degree of blur of the CC visual target images 53a and 53b and adjusting the relative angle of the VCC 43 so that both blurs are substantially the same, the correct astigmatism amount and axis angle can be determined.

  (Step 06) After the CC target images 53a and 53b are presented, the optometric target LCD 36 displays a predetermined target (hereinafter referred to as a fixation LCD mark) at a predetermined position and presents it to the eye E. For example, as shown in FIG. 4B, a fixation LCD mark 58a (1 in FIG. 4B) made up of arithmetic numbers is displayed at a position corresponding to the CC visual target image 53a. A fixation LCD mark 58b (2 in FIG. 4B) is displayed at a position corresponding to the target image 53b. The fixation LCD mark 58b is composed of different numbers from the fixation LCD mark 58a.

  FIGS. 5A to 5E show an example of presentation when the CC visual target images 53a and 53b and the fixation LCD marks 58a and 58b are simultaneously presented to the eye E. FIG.

  Since the LED 45 and the optometry target LCD 36 are simultaneously turned on, the CC target images 53a and 53b and the CC target image 53a are displayed in the vicinity as shown in FIG. The fixation LCD mark 58a and the fixation LCD mark 58b displayed in the vicinity of the CC visual target image 53b are simultaneously presented to the eye E and can be visually recognized.

  The fixation LCD marks 58a and 58b may be L and R with the initials of Left and Right as shown in FIG. 5B. Further, as shown in FIGS. 5C and 5D, kanji characters such as left and right and up and down may be used as the fixation LCD marks 58a and 58b. Further, as shown in FIG. 5E, the fixation LCD marks 58a and 58b may be, for example, red and green circles, and the CC visual target images 53a and 53b may be surrounded by the circles.

  The form of the fixation LCD marks 58a and 58b is not limited to the above five patterns, and any form may be used as long as the CC visual target images 53a and 53b can be identified. For example, the fixation LCD marks 58a and 58b may be Chinese numerals or Roman numerals, or the CC visual target images 53a and 53b may be surrounded as figures having different shapes. Further, it goes without saying that the fixation LCD marks 58a and 58b may be symbols such as arrows having different shapes.

  (Step 07) After the fixation LCD marks 58a and 58b are presented, the fixation LCD marks 58a and 58b are turned off when a predetermined time that can be fully recognized by the subject elapses.

  Since the fixation LCD marks 58a and 58b do not pass through the prism-attached CC lens 49, they both have the same “appearance”. The CC fixation target images 53a and 53b are visually recognized in the same manner by blurring either one of the target images or both. Accordingly, the eye E adjusts by paying attention to the fixation LCD marks 58a and 58b, or pays attention to the fixation LCD marks 58a and 58b, not the CC visual target images 53a and 53b. It is possible to avoid problems such as misidentifying that it is clearly visible.

  STEP: 08 The examiner asks which image is clearly (clearly) visible, and the examiner determines which of the CC visual target images 53a and 53b is clearly visible. When it is determined that the CC target images 53a and 53b appear to be blurred (clearly) to the same extent, the subject responds to that effect and the CC test is completed. The response of the subject may be a voice, a lever that can be tilted, or a button that can designate the fixation LCD marks 58a and 58b.

  Further, when the clarity of the CC visual target images 53a and 53b is different, the subject displays the fixation LCD marks 58a and 58b corresponding to the CC visual target images 53a and 53b that are clearly visible. Respond to.

  STEP: 09 STEP: 10 Based on the response of the subject, the examiner changes the conditions and confirms with the subject again. That is, the VCC lens 43 is relatively rotated to adjust the astigmatism amount and the astigmatism axis angle. The prism-attached CC lens 49 rotates in accordance with the axial angle generated by the VCC lens 43. Further, the fixation LCD marks 58a and 58b are displayed on the optometric target LCD 36 and presented to the eye E to be examined.

  At this time, as shown in FIGS. 6 (A) to 6 (D), the positional relationship between the CC visual target images 53a and 53b also changes in accordance with the rotation angle of the CC lens 49 with prism. In this embodiment, the display positions of the fixation LCD marks 58a, 58b change following the change in the rotation angle of the CC lens 49 with prism, so that the CC visual target images 53a, 53b. Regardless of the positional relationship, the fixation LCD marks 58a and 58b are always displayed in the vicinity of the corresponding CC visual target images 53a and 53b.

  STEP: 11 When a predetermined time elapses after the fixation LCD marks 58a, 58b are presented, the fixation LCD marks 58a, 58b are turned off, and the determination of STEP: 08 is performed again by the subject.

  When the subject responds to the examiner that the CC visual target images 53a and 53b are comparable, the CC test is completed. In addition, when the subject responds to the examiner that either one of the CC visual target images 53a and 53b is clearly visible, the subject has the same CC visual target image 53a and 53b. Steps 09 to 11 are repeated until a response is made.

  By completing the above-described steps STEP-01 to STEP11, the control unit 57 performs the astigmatism amount of the eye E based on the relative rotation amount of the VCC lens 43 and the integral rotation amount of the VCC lens 43. And the astigmatic axis angle can be calculated. Thereby, the CC test for measuring the astigmatism amount and the astigmatism axis angle is completed. Thereafter, a red-green test, a binocular open test, and the like are performed, and the subjective test is completed.

  As described above, in this embodiment, the CC target light projection optical system 7 is provided, and the two CC target images 53a and 53b projected from the CC target light projection optical system 7 are simultaneously measured on the eye E. It is presented.

  Therefore, the subject can view the CC target images 53a and 53b having different axis angles by 90 ° at the same time, memorize how clear one target image is, and store the other target image. Since it is not necessary to perform comparison with the image, the burden on the subject can be reduced.

  Further, together with the CC target images 53a and 53b, the fixation LCD marks 58a and 58b projected from the target light projection optical system 6 are simultaneously presented to the eye E, and the fixation LCD marks 58a and 58b are displayed. They are presented in the vicinity of the corresponding CC visual target images 53a and 53b.

  Therefore, the subject answers the fixation LCD marks 58a and 58b positioned in the vicinity of the CC visual images 53a and 53b that are clearly visible regardless of the arrangement of the CC visual images 53a and 53b. Thus, the burden on the subject can be reduced, the erroneous answer of the subject can be suppressed, measurement time can be shortened, and workability can be improved.

  In addition, the fixation positions of the fixation LCD marks 58a and 58b are changed in accordance with the arrangement of the CC visual target images 53a and 53b that change due to the rotation of the CC lens 49 with prism. Even if the CC test is repeated and the arrangement of the CC visual target images 53a and 53b is sequentially changed, the presenting positions of the fixation LCD marks 58a and 58b following the CC visual target images 53a and 53b. Is changed.

  Accordingly, the fixation LCD marks 58a and 58b are always located in the vicinity of the corresponding CC visual target images 53a and 53b, so that the subject is not confused and mistaken, and the burden on the subject is reduced. In addition, measurement time can be shortened and workability can be improved.

  In this embodiment, the CC test is performed by the steps of STEP: 01 to STEP: 11. However, the CC test step is not limited to the above.

  For example, when presenting the fixation LCD marks 58a and 58b in STEP: 06, the fixation LCD marks 58a and 58b displayed on the optometry target LCD 36 are more than the presenting positions of the CC target images 53a and 53b. The position of the focusing lens 38 is adjusted to the cloud fog position so that it is presented far away. As a result, the fixation target or the fixation LCD marks 58a and 58b are presented at a distance where the eye E cannot be focused, and the image is blurred as a blurred image (cloud image) compared to the CC visual target images 53a and 53b. Visible to the examiner. Therefore, it becomes difficult for the eye E to become an adjustment stimulus for focusing on the fixation LCD marks 58a and 58b, and the influence on the optometry can be avoided.

  The clarity of the fixation LCD marks 58a and 58b is preferably such that the fixation LCD marks 58a and 58b can be recognized and is more blurred than the CC visual target images 53a and 53b.

  Since the fixation LCD marks 58a and 58b are presented at a position (cloud position) where the eye E cannot be focused, the fixation LCD marks 58a and 58b do not become an adjustment stimulus. The marks 58a and 58b can be continuously presented without being turned off.

  Accordingly, since the step of turning off the fixation LCD marks 58a and 58b after a predetermined time of STEP: 07 and STEP: 11 is not required, the number of steps can be reduced, the measurement time can be shortened, and the workability can be improved. Can be achieved.

  In STEP 08, the CC target images 53a, 53b and the fixation LCD marks 58a, 58b are presented at the same time. Can be further reduced.

  The optometry target LCD 36 emits light when the fixation LCD marks 58a and 58b are presented to the eye E, with the fixation LCD marks 58a and 58b being black and the other portions being white. For this reason, since the white light from the optometry target LCD 36 is superimposed on the CC target images 53a and 53b, the contrast of the CC target images 53a and 53b is reduced. There is a possibility that the visibility may be lowered.

  In order to prevent the contrast of the CC visual target images 53a and 53b from being lowered, for example, as shown in FIG. 7B, only the periphery of the fixation LCD marks 58a and 58b is white and the other portions are black. The optometric target LCD 36 may emit light. Alternatively, when the optometric target LCD 36 is a color LCD, only the fixation LCD marks 58a and 58b may be emitted with colors such as red and green.

  With the configuration as described above, it is possible to prevent the CC target images 53a and 53b and the white light from the optometry target LCD 36 from overlapping, and to prevent the contrast of the CC target images 53a and 53b from being lowered. The visibility of the CC visual target images 53a and 53b is improved, and the accuracy of the response by the subject can be improved.

  In this embodiment, based on the response of the subject, the examiner changed the conditions such as the rotation of the prism-equipped CC lens 49 and performed the CC test. A test may be performed.

  For example, a mouse is connected to the control unit 57, and a mouse pointer 61 that moves in conjunction with the mouse is displayed on the optometric target LCD 36 as shown in FIG. 62 is displayed. At this time, the eye E to be examined is a combination of the CC target images 53a and 53b shown in FIG. 8A and FIG. 8B as shown in FIG. 8C. Has been.

  The subject moves the mouse pointer 61 to a clearly visible CC target image among the CC target images 53a and 53b and clicks it. Alternatively, when the CC visual target images 53a and 53b look the same, the mouse pointer 61 is moved on the icon 62 and clicked.

  Further, as shown in FIG. 8D, an input pad is connected to the control unit 57, and an input pointer 63 that moves in conjunction with the input position is displayed on the optometry target LCD 36, and “not changed” is displayed. The icon 62 may be displayed.

  The subject moves the input pointer 63 over the clearly visible CC visual target image among the CC visual target images 53a and 53b, and circles it. Alternatively, when the CC visual target images 53a and 53b look the same, the icon 62 is circled or touched.

  The control unit 57 performs various processes such as changing the condition and ending the CC test based on the positions of the mouse pointer 61 and the input pointer 63 on the optometric target LCD 36 when an input signal is generated by clicking or the like. Is performed automatically.

  By setting it as the above structures, it becomes possible for a subject to perform CC test independently, and workability | operativity can be improved further. In addition, the structure which a subject can implement a CC test independently is not restricted to the above.

  Next, a case where a binocular open test is performed using the optometry apparatus of the present embodiment will be described. FIG. 9 is a schematic diagram showing the positional relationship between the optometry apparatus and the subject, and optometry optical systems 1a and 1b are provided for the left eye and the right eye, respectively.

  10A, FIG. 10B, FIG. 11A, FIG. 11B, FIG. 12A, and FIG. 12B show the CC test for the left eye in the binocular open test. The example of a display in the case of performing is shown.

  In the optometry optical system 1a of the left eye, as shown in FIG. 10A, the CC target light projection optical system 7 projects the CC target images 53a and 53b. Further, as shown in FIG. 10B, the optometrist light projection optical system 6 is configured so that only the periphery of the fixation LCD marks 58a and 58b and the periphery of the fusion frame 59 are white. The target LCD 36 emits light.

  10A and 10B are combined so that the subject can see the CC visual target images 53a, 53b and the fixation LCD mark 58a, as shown in FIG. The image in which the 58b and the fusion frame 59 are presented can be visually recognized with the left eye, and the CC test for the left eye is performed based on the visually recognized image. Since the CC test is the same as described above, the description thereof is omitted.

  In the right-eye optometry optical system 1b, as shown in FIG. 11A, the CC target light projection optical system 7 does not project the CC target images 53a and 53b. Further, as shown in FIG. 11B, the optotype light projection optical system 6 is configured so that only the fixation LCD marks 58a and 58b and the fusion frame 59 are black, so that the optometry target LCD 36 is black. To emit light.

  11A and 11B are combined to allow the subject to obtain the fixation LCD marks 58a and 58b and the fusion frame 59 as shown in FIG. 12B. The presented image can be visually recognized.

  As described above, by presenting the image as shown in FIG. 12B, particularly the image having the fusion frame 59, to the right eye not subjected to the CC test, the right eye is fused. And can keep the binocular vision.

  In order to reduce the difference in luminance and unevenness in the images presented to both eyes, the luminance of the pixels of the optometry target LCD 36 is adjusted between the optometry optical system 1a and the optometry optical system 1b. It is desirable.

1 Optometry Optical System 6 Target Light Projection Optical System 7 CC Target Light Projection Optical System 36 Optometry Target LCD
38 Focusing lens 43 VCC lens 45 LED
46 Diffuser plate 47 CC target plate 49 CC lens with prism 53 CC target image 57 Control unit 58a, 58b Fixation LCD mark

Claims (7)

  A light beam splitting member that splits the light beam for projecting the first visual target image into two or more light beams having different axial angles, and projects the second visual target image on the eye to be examined in a separated state. One target projection means, second target projection means for projecting two or more second target images corresponding to each of the two or more first target images onto the eye to be examined, and the first view A control unit that controls the target projecting unit and the second target projecting unit, and the control unit can identify the first target image based on the second target image. An optometry apparatus configured to simultaneously present the first visual target image and the second visual target image to the eye to be examined.   The first target image is a target image for a cross cylinder test, and the light beam splitting member is a cross cylinder with a prism in which a prism and a cross cylinder are integrated. The optometry apparatus according to claim 1, wherein the optometry apparatus is divided so as to have different angles.   The optometry apparatus according to claim 1, wherein the second visual target image includes any one of numerals, characters, symbols, and colors that can identify each first visual target image.   The optometry apparatus according to any one of claims 1 to 3, wherein the control unit turns off only the second visual target image after a predetermined time has elapsed.   The second visual target projection means further includes a presentation position changing member, and the control unit moves the presentation position changing member along the optical axis of the second visual target projection means, and the second visual target projection means. The optometry apparatus according to any one of claims 1 to 3, wherein a target image is displayed farther than a display position of the first visual target image.   6. The control unit according to claim 1, wherein the control unit changes a position where each second visual target image is presented following a change in a position of each first visual target image presented to the eye to be examined. The optometry apparatus as described in any one of them.   The said control part is an optometry apparatus as described in any one of Claims 1-6 which makes the said to-be-examined eye present only the circumference | surroundings of a said 2nd visual target image as white, and another part as black.

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