JP2004097377A - Ocular characteristics measuring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ocular characteristics measuring apparatus which can measure the ophtalmologically significant optical characteristics by determining the centers of the pupils for measuring the ocular characteristics to match the shape of the pupils of the eyes to be examined. <P>SOLUTION: The measuring apparatus is provided with the first lighting optical system 10 for admitting the light fluxes into the eyes 60 to be examined, the first photodetecting optical system 20 which contains the first photodetecting part 23 for receiving the reflected light from the eyes 60 to be examined, an optical characteristics operating part 200 which obtains the optical characteristic data containing the high-order aberration of the eyes 60 to be examined based on the outputs of the first photodetecting part 23, the second photodetecting optical system 30 which contains the second photodetecting part 35 that receives the reflected light fluxes from the anterior ocular segments of the eyes 60 to be examined to form the signals of the anterior ocular segments, and a target presentation part 130 which presents a target for subjective optometry to the eyes 60 to be examined through a flux limiting part 134 adapted to make it incident in a deformation into the specified shape of the fluxes. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an eye characteristic measuring apparatus for measuring eyeball aberration and the like of a subject's eye with high accuracy, and particularly, appropriately measures eyeball aberrations and the like of a subject's eye even when the pupil of the subject's eye is distorted with respect to a perfect circle. The present invention relates to a device for measuring eye characteristics.
[0002]
[Prior art]
In a conventional measuring apparatus for measuring aberrations of an eye to be inspected, a light beam reflected by a fundus of the eye to be inspected is limited by a pupil of the eye to be inspected, and projected to a measurement light receiving system to calculate an eyeball aberration of the eye to be inspected (for example, See 2002-209854). In such a conventional optical characteristic measuring apparatus, the center for obtaining the ocular aberration is treated as the pupil center on the premise that the pupil of the eye to be examined is close to a circle.
[0003]
[Patent Document 1]
JP-A-2002-209854 (the entire specification, in particular, FIGS. 1, 3, and 5)
[0004]
[Problems to be solved by the invention]
However, the number of cataract patients and myopia correction patients who perform refractive surgery in recent years is increasing. Not a few. When the pupil of the eye to be examined deviates significantly from a perfect circle, even if the optical characteristics are measured with the center of the pupil as the center for obtaining the ocular aberration, the image is different from the image recognized by the retina of the eye to be examined, which is useful ophthalmologically. There has been a problem that optical characteristics representing an image recognized by the retina of the eye cannot be measured.
[0005]
The present invention has solved the above-mentioned problems, and determines the center of the pupil of the eye characteristic in conformity with the shape of the pupil of the eye to be inspected, so that the optical characteristics of the eye to be examined that are ophthalmologically significant can be measured. It is an object to provide a measuring device.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, an eye characteristic measuring apparatus according to the present invention includes, as shown in FIG. 1, a first illumination optical system 10 for causing a light beam to enter a subject's eye 60, and reflected light from the subject's eye 60. A first light receiving optical system 20 including a first light receiving unit 23 for receiving light; an optical property calculating unit 200 for obtaining optical property data including higher-order aberrations of the subject's eye 60 based on the output of the first light receiving unit 23; A second light receiving optical system 30 including a second light receiving unit 35 that receives a reflected light beam from the anterior segment of the optometry eye and forms an anterior segment signal; And an optotype presenting unit 130 that presents the light via a light beam restricting unit 134 that makes the light incident.
[0007]
In the device configured as described above, the light flux is restricted according to a predetermined shape, for example, the pupil shape of the subject's eye by the light flux restricting unit 134, and the optotype, for example, the optotype optotype, is projected by the optotype presenting unit 130. I do. Since the second light receiving optical system 30 receives the reflected light beam from the anterior segment of the eye 60 and forms an anterior segment signal, the second light receiving optical system 30 serves as a reference when the target is deformed into a predetermined light beam shape. The pupil shape is obtained. Since the light beam illuminated from the first illumination optical system 10 is reflected from the eye to be inspected 60 and received by the first light receiving unit 23, the optical characteristic calculation unit 200 outputs the light of the eye to be inspected 60 based on the output of the first light receiving unit 23. Optical characteristic data including higher order aberrations is obtained. The optical characteristic calculation unit 200 determines a pupil region of the subject's eye for obtaining optical property data including higher-order aberrations of the subject's eye 60 using, for example, an anterior segment signal of the second light receiving optical system 30.
[0008]
Preferably, the optical characteristic calculation unit 200 uses the anterior segment signal of the second light receiving optical system 30 to determine a pupil region of the eye to be examined for obtaining optical characteristic data including higher-order aberrations of the eye to be examined 60. The target presenting unit 130 is configured to display the target so that the light flux limiting unit 134 presents the target at the center of the pupil of the eye when the pupil shape of the eye to be inspected is distorted with respect to a perfect circle. It is preferable to transform the light beam into the shape of a light beam. Further, the optical characteristic calculation unit 200 deforms the light flux shape of the visual target by the light flux limiting unit 134, and obtains the optical characteristics including the higher-order aberration of the eye 60 to be inspected with respect to the center part of the pupil of the eye to be presented with the visual target. It is preferable to select a pupil region of the eye to be examined for which data is to be obtained. The selection of the pupil region of the eye to be inspected includes a case where the light beam illuminated by the first illumination optical system 10 is narrowed, a case where the reflected light beam from the eye 60 to be received received by the first light receiving unit 23 is narrowed, There are cases where the region for obtaining the optical characteristic data including the 60 higher-order aberrations is limited.
[0009]
Preferably, the first illumination optical system 10 is formed so as to illuminate a minute area on the retina of the eye 60 with the light beam from the first light source unit 11, and the first light receiving optical system 20 is configured to illuminate the eye 60 with the light. A part of the light beam reflected and returned from the retina is guided to the first light receiving unit 23 via the first conversion member 22 for converting the reflected light beam into at least substantially 17 beams, The characteristic calculation unit 200 may be formed so as to obtain optical characteristic data including higher-order aberrations of the subject's eye 60 using the reflected light beam converted into the beam.
[0010]
Preferably, the optotype presenting unit 130 may be configured to present at least one optotype of a general visual acuity chart and a contrast chart. Here, if the low-order aberration visual acuity chart is formed by a general visual acuity chart, for example, comparison with the spherical power S of the eye to be measured 60 measured by the optical property calculation unit 200 can be performed by subjective optometry. In addition, when the high-order aberration visual acuity chart is formed by a contrast chart, for example, comparison with a high-order wavefront aberration of the eye to be inspected 60 measured by the optical characteristic calculation unit 200 can be performed by subjective optometry.
[0011]
Preferably, as shown in FIG. 3, for example, a high visual acuity contributing region extracting unit 226 that extracts a region that is highly contributing to visual acuity from the pupil shape of the subject's eye 60 included in the anterior segment signal is provided. The luminous flux restricting unit 134 of the presenting unit 130 is formed so as to restrict the optotype luminous flux that presents the optotype to an area that contributes to the visual acuity extracted by the high visual acuity contributing area extracting unit 226. Good. With this configuration, it is possible to prevent the optotype luminous flux presenting the optotype from entering a pupil region that is low enough to contribute to visual acuity, and to perform optimal subjective optometry according to the pupil shape.
[0012]
Preferably, for example, as shown in FIG. 3, the pupil shape determining unit 224 that determines the pupil shape based on the anterior eye image of the subject's eye obtained by the second light receiving unit 35, The configuration may be such that optical characteristic data including higher-order aberrations of the eye to be inspected 60 is obtained based on the pupil shape determined by the pupil shape determination unit 224. With this configuration, when a high pupil region and a low pupil region contributing to visual acuity coexist, such as when the pupil shape is greatly distorted with respect to a perfect circle, the high-order aberration of the eye 60 to be examined is reduced. A pupil region that is high enough to contribute to visual acuity can be selected as a measurement region for optical property data that includes the pupil.
[0013]
Preferably, for example, as shown in FIG. 1, the optotype presenting unit 130 further includes a correction optical system 138, and the correction optical system 138 is used in accordance with the low-order aberration of the eye 60 measured by the optical characteristic calculation unit 200. The system 138 may be configured to correct the eye 60 to be inspected. Preferably, when astigmatism is present in the subject's eye 60, the correction optical system 138 may be configured to correct the subject's eye 60 for astigmatism.
[0014]
Preferably, for example, as shown in FIG. 3, the display unit 280 that forms an image of the anterior segment of the eye to be inspected based on the signal from the second light receiving unit 35, and the eye to be inspected by the optical characteristic calculation unit 200 from the first light receiving unit 23 A selection unit 228 for selecting a signal to be used for the optical characteristic measurement processing of Step 60 is provided. The selection unit 228 selects a signal in a selected range based on the eye image formed on the display unit 280, and May be configured to obtain optical characteristic data including higher-order aberrations of the subject's eye based on signals in the range selected by the selection unit 228.
[0015]
In the device configured as described above, the examiner selects a signal in the range selected based on the eye image displayed on the display unit 280, and the optical characteristic calculation unit 200 selects the signal in the range selected by the selection unit 228. By obtaining optical characteristic data including higher-order aberrations of the eye to be inspected based on the signal, manual measurement by the examiner can be performed, and particularly according to the pupil shape, such as when the pupil shape is greatly distorted with respect to a perfect circle. Individual correspondence is possible.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding members are denoted by the same or similar reference numerals, and redundant description will be omitted.
FIG. 1 is an overall configuration diagram of an optical characteristic measuring apparatus 100 according to the present invention, showing a schematic configuration of an optical system and an arithmetic and control unit. The optical characteristic measuring device 100 is a device that measures the optical characteristics of the subject's eye 60, which is the target, and also measures the fracturing force. That is, the first illumination optical system 10, the first light receiving optical system 20, the second light receiving optical system 30, the common optical system 40, the adjusting optical system 50, and the second illumination optical system 70 as optical characteristic measuring devices of the eye 60 to be inspected. , A third illumination optical system 75, a first moving unit 110, and a second moving unit 120. As the refractive power measuring device, an illumination optical system 80 for measuring a refractive power and a light receiving optical system 90 for measuring a refractive power are provided, and the optical characteristic measuring device and the optical system of the eye 60 to be examined are shared. As for the eye to be examined 60, a retina 61 and a cornea 62 are shown in the figure. Further, a target presentation unit 130 is provided as a subjective optometry apparatus.
[0017]
The first illumination optical system 10 includes, for example, a first light source unit 11, a condenser lens 12, a lens 13, and a stop 14 for emitting a light beam of a first wavelength, and a light beam (first illumination) from the first light source unit 11. This is for illuminating a minute area on the retina (fundus) 61 of the eye to be examined 60 with a light beam so that the illumination conditions can be appropriately set. The first illumination optical system 10 can move the light condensing position by the first moving unit 110. Note that the first wavelength of the illumination light beam emitted from the first light source unit 11 may be an infrared wavelength (for example, 780 nm). When a super luminescence diode (SLD) is used as the first light source unit 11, for example, a point light source having high spatial coherence, low temporal coherence, and high luminance can be obtained.
[0018]
The lens 12 converts the diffused light of the first light source unit 11 into parallel light. The stop 14 is located at a position optically conjugate with the pupil of the eye and the Hartmann plate 22. The aperture 14 has a diameter smaller than the effective range of the Hartmann plate 22, so that a so-called single-pass aberration measurement (a method in which the eye aberration affects only the light receiving side) is established. The lens 13 has the fundus conjugate point of the real ray at the front focal position to satisfy the single-pass aberration measurement condition, and the rear focal position coincides with the aperture 14 to satisfy the conjugate relationship with the pupil of the eye. It is arranged to be.
[0019]
The first light receiving optical system 20 is, for example, a collimating lens 21 and a conversion member that converts a part of a light beam (first light beam) reflected and returned from the retina 61 of the eye 60 to be examined into at least 17 beams. A Hartmann plate 22 and a first light receiving unit 23 for receiving a plurality of beams converted by the Hartmann plate 22 are provided to guide the first light flux to the first light receiving unit 23. Here, the first light receiving unit 23 employs a CCD with little readout noise. Examples of the CCD include a general low noise type, a 1000 * 1000 element cooled CCD for measurement, and the like. Appropriate types can be applied. The signal received by the first light receiving unit 23 is used for obtaining, for example, an eye wavefront aberration.
[0020]
The first moving unit 110 is a parallel moving mechanism that moves the first illumination optical system 10, and for example, a driving force is supplied from a motor (not shown). The focusing position of the first illumination light beam from the first illumination optical system 10 can be adjusted by the first moving unit 110. The second moving unit 120 is a parallel moving mechanism that moves the first light receiving optical system 20, and for example, a driving force is supplied from a motor (not shown). The second moving unit 120 can adjust the plurality of beams converted by the Hartmann plate 22 so as to be focused on the first light receiving unit 23. In addition, the first moving unit 110 and the second moving unit 120 may be a parallel moving mechanism that moves the first illumination optical system 10 and the first light receiving optical system 20 by an operator's manual operation. Since the first moving unit 110 and the second moving unit 120 are parallel moving mechanisms for optics, it is preferable to use a mechanism capable of accurate positioning at about several μm.
[0021]
The third illumination optical system 75 mainly performs, for example, an alignment adjustment described later, and includes a third light source unit 31, a condenser lens 32, and a beam splitter 33 for emitting a light beam of a third wavelength. The second illumination optical system 70 includes a Placido ring 71 and a second light source unit 72 for emitting a light beam of a second wavelength. Note that the second light source section 72 can be omitted.
[0022]
FIG. 2 is a configuration diagram illustrating an example of the Placido ring 71. The placid ring (Placido's disc) 71 projects an index of a pattern composed of a plurality of concentric orbicular zones after completing an alignment adjustment described later composed of a plurality of concentric orbicular zones. Incidentally, the pattern composed of a plurality of concentric rings is suitable as a pattern for measuring the optical characteristics of the eye including the retina and the crystalline lens, such as a pattern in which light spots are distributed in a grid, It may be replaced with a pattern.
[0023]
Returning to FIG. 1, the second light receiving optical system 30 includes a condenser lens 34 and a second light receiving unit 35. The second light receiving optical system 30 converts the pattern of the Placido ring 71 illuminated from the second illumination optical system 70 into a light flux (second light flux) reflected from the anterior eye part of the eye to be examined 60 or the cornea 62 and returned. The light is guided to the second light receiving unit 35. Further, the second light receiving optical system 30 can guide the light flux (third light flux) emitted from the third light source unit 31 and reflected from the cornea 62 of the subject's eye 60 and returned to the second light receiving unit 35. . In addition, the second wavelength and the third wavelength of the light beam emitted from the second light source unit 72 and the third light source unit 31 are different from the first wavelength (here, 780 nm, for example) and a longer wavelength can be selected (for example, 940 nm). The signal received by the second light receiving unit 35 is used for, for example, alignment adjustment and determining corneal wavefront aberration.
[0024]
The common optical system 40 is disposed on the optical axis of a light beam emitted from the first illumination optical system 10, and includes a first illumination optical system 10, a first light receiving optical system 20, a second light receiving optical system 30, and a second illumination optical system. 70 and the third illumination optical system 75, and include, for example, an afocal lens 42, beam splitters 43 and 45, and a condenser lens 44. Further, the beam splitter 43 transmits (reflects) the wavelength of the third light source unit 31 to the eye to be inspected 60, reflects the second light flux reflected from the cornea 62 of the eye to be inspected 60 and returned, and meanwhile, reflects the first light beam. The light source unit 11 is formed of a mirror that transmits the wavelength (for example, a dichroic mirror). The beam splitter 45 transmits (reflects) the wavelength of the first light source unit 11 to the subject's eye 60, and transmits a first light flux reflected from the retina 61 of the subject's eye 60 and returning (for example, a mirror that transmits the first light flux). (Polarizing beam splitter). The beam splitters 43 and 45 prevent the first light beam, the second light beam, and the third light beam from entering the other optical system and causing noise.
[0025]
The adjustment optical system 50 mainly performs, for example, working distance adjustment, and includes a fourth light source unit 51, a fifth light source unit 55, condenser lenses 52 and 53, and a fourth light receiving unit 54. The adjustment of the working distance is performed, for example, by irradiating a parallel light flux near the optical axis emitted from the fifth light source unit 55 toward the eye to be inspected 60, and transmitting the light reflected from the eye to be inspected 60 to the condenser lens 52. , 53 by the fourth light receiving unit 54 receiving light. When the subject's eye 60 is at an appropriate working distance, a spot image from the fifth light source unit 55 is formed on the optical axis of the fourth light receiving unit 54. On the other hand, when the subject's eye 60 deviates back and forth from the proper working distance, the spot image from the fifth light source unit 55 is formed above or below the optical axis of the fourth light receiving unit 54. Note that the fourth light receiving unit 54 only needs to be able to detect a change in the light source position in the plane including the fifth light source unit 55, the optical axis, and the fourth light receiving unit 54. A CCD, a position sensing device (PSD), or the like can be applied.
[0026]
Next, the alignment adjustment will be described. The alignment adjustment is mainly performed by the second light receiving optical system 30 and the third illumination optical system 75. First, the light beam from the third light source unit 31 illuminates the subject's eye 60 as a target with a substantially parallel light beam via the condenser lens 32, the beam splitters 33 and 43, and the afocal lens 42. The reflected light beam reflected by the cornea 62 of the eye to be inspected 60 is emitted as a divergent light beam as if it were emitted from a point having a half radius of curvature of the cornea 62. The divergent light beam is received as a spot image by the second light receiving unit 35 via the afocal lens 42, the beam splitters 43 and 33, and the condenser lens 34.
[0027]
Here, when the spot image on the second light receiving unit 35 is off the optical axis, the main body of the optical characteristic measuring device 100 is moved up and down and left and right to make the spot image coincide with the optical axis. As described above, when the spot image coincides with the optical axis, the alignment adjustment is completed. In the alignment adjustment, the cornea 62 of the subject's eye 60 is illuminated by the fourth light source unit 51, and an image of the subject's eye 60 obtained by this illumination is formed on the second light receiving unit 35. The center of the pupil may coincide with the optical axis.
[0028]
Next, the positional relationship between the first illumination optical system 10 and the first light receiving optical system 20 will be schematically described. A beam splitter 45 is inserted into the first light receiving optical system 20, and the light from the first illumination optical system 10 is transmitted to the eye to be examined 60 by the beam splitter 45, and the light from the eye to be examined 60 The reflected light is transmitted. The first light receiving unit 23 included in the first light receiving optical system 20 receives light that has passed through the Hartmann plate 22, which is a conversion member, and generates a light receiving signal.
[0029]
Further, the first light source unit 11 and the retina 61 of the subject's eye 60 form a conjugate relationship. The retina 61 of the subject's eye 60 and the first light receiving unit 23 are conjugate. Further, the Hartmann plate 22 and the pupil of the subject's eye 60 form a conjugate relationship. Further, in the first light receiving optical system 20, the cornea 62 and the Hartmann plate 22 have a substantially conjugate relationship. That is, the front focal point of the afocal lens 42 substantially matches the pupil.
[0030]
After the light beam 15 has a common optical path with the light beam 24 and the beam splitter 45, the light beam 15 travels in the same paraxial manner as the light beam 24. However, in the case of the single-pass measurement, the diameter of each light beam is different, and the beam diameter of the light beam 15 is set to be considerably smaller than that of the light beam 24. Specifically, the beam diameter of the light ray 15 may be, for example, about 1 mm at the pupil position of the eye, and the beam diameter of the light ray 24 may be about 7 mm (in FIG. 61 is omitted).
[0031]
Next, the Hartmann plate 22 as a conversion member will be described. The Hartmann plate 22 included in the first light receiving optical system 20 is a wavefront converting member that converts a reflected light beam into a plurality of beams. Here, a plurality of micro Fresnel lenses arranged in a plane orthogonal to the optical axis are applied to the Hartmann plate 22. In general, for the measurement target portion (eye to be inspected 60), the spherical eye component of the eye to be inspected 60, the third-order astigmatism, and the Zernike third- and fourth-order high-order aberrations are also measured. It is known that it is necessary to measure with at least 17 beams through.
[0032]
Here, the micro Fresnel lens is an optical element, and includes, for example, an annular zone having a height pitch for each wavelength, and a blaze optimized for emission parallel to the converging point. The micro Fresnel lens here has, for example, an optical path length difference of eight levels to which a semiconductor fine processing technology is applied, and achieves a high light collection rate (for example, 98%).
[0033]
The reflected light from the retina 61 of the subject's eye 60 passes through the afocal lens 42 and the collimating lens 21, and is condensed on the first light receiving unit 23 as the primary light via the Hartmann plate 22. In addition, the Hartmann plate 22 may include a microlens portion that performs a converging operation and an opening that performs a transmitting operation for each of at least 17 regions. Therefore, the Hartmann plate 22 includes a wavefront conversion member that converts the reflected light beam into at least 17 or more beams.
[0034]
The illumination optical system 80 for measuring a refractive power includes a light source 81 for measuring a refractive power, a collimating lens 82, a ring-shaped pattern 83 for measuring a refractive power, a relay lens 84, and a beam splitter 87. The illumination light beam emitted from the refractive power measurement light source 81 is converted into a parallel light beam by the collimating lens 82 and illuminates the ring pattern 83 for refractive power measurement. The illuminated light beam from the refractive power measurement ring-shaped pattern 83 becomes parallel by a relay lens 84, passes through a stop 85 conjugate with the pupil, and a relay lens 86, and passes through a beam splitter 87 to the first illumination optical system 10. And illuminates the retina 61 of the subject's eye 60 via the common optical system 40. The ring-shaped pattern 83 for measuring the refractive power has a conjugate positional relationship with the fundus of the eye to be examined at the time of measurement of the eye to be examined for emmetropia.
[0035]
The refractive power measuring light receiving optical system 90 includes a beam splitter 91, a relay lens 92, and a refractive power measuring light receiving unit 93. The light beam reflected from the retina 61 of the subject's eye 60 illuminated by the ring reaches the beam splitter 91 via the common optical system 40, is reflected there and condensed by the relay lens 92, and then receives the light for measuring the refractive power. The light is received by the unit 93 as a light reception signal for refractive power measurement. The light-receiving signal for refractive power measurement indicating the ring-shaped pattern image for refractive power measurement projected on the retina is sent to the optical property calculation unit 200. Preferably, a two-dimensional sensor is used for the refractive power measuring light receiving section 93.
[0036]
The optical characteristic calculation unit 200 obtains the refractive power of the eye to be inspected from the refractive power measurement ring-shaped pattern image projected on the retina based on the refractive power measurement light receiving signal. The calculation of the refractive power is disclosed in detail in Japanese Patent No. 2580215, and the detailed description thereof is omitted here by using the description of the gazette of the patent right.
[0037]
The optotype presenting section 130 includes an optotype presenting light source 131, a collimating lens 132, an optotype plate 133, a light beam restricting section 134, a relay lens 136, a beam splitter 137, a correcting lens 138, and a third moving section 139. The illumination light beam emitted from the optotype presenting light source 131 is converted into a parallel light beam by the collimating lens 132 and illuminates the optotype plate 133. The illuminated luminous flux from the target plate 133 is narrowed by the luminous flux limiting unit 134 conjugate with the pupil, passes through the relay lens 136, overlaps the optical axis of the first illumination optical system 10 via the beam splitter 137, and corrects the light. The eye lens 138 is adjusted to match the eyesight of the eye 60 to be inspected, and the common eye 40 illuminates the retina 61 of the eye 60 through the common optical system 40. The light beam restricting unit 134 narrows the light beam from the optotype plate 133. For example, a liquid crystal shutter is used, and a region through which the light beam passes and a region to be shielded can be selected so as to conform to the shape of the pupil.
[0038]
The optotype plate 133 selectively presents a low-order aberration visual acuity chart and a high-order aberration visual acuity chart. A general visual acuity chart is used as the low-order aberration visual acuity chart, and a high-order aberration visual acuity is used. A contrast chart is used as the chart. The light beam restricting unit 134 deforms the subjective eye test target into a predetermined light beam shape to enter the subject's eye 60 to the subject's eye 60, and will be described later in detail. The correction lens 138 adjusts the target presented by the target presenting unit 130 so as to clearly focus on the retina of the subject's eye 60, and is adjusted to an appropriate position by the third moving unit 139, for example. . In addition, the correction lens 138 adjusts the illumination light of the first illumination optical system 10 so as to match the eyesight of the eye 60 to be inspected.
[0039]
Next, an arithmetic and control unit of the optical characteristic measuring apparatus 100 shown in FIG. 1 will be described. The arithmetic control device includes an optical characteristic arithmetic unit 200, a lens movement control unit 250, a light source control unit 260, an aperture shape control unit 270, and a display unit 280. The optical characteristic calculation unit 200 receives light receiving signals sent from the first light receiving optical system 20, the second light receiving optical system 30, the fourth light receiving unit 54 of the adjustment optical system 50, and the light receiving optical system 90 for measuring refractive power. And optical characteristics of the eye, such as total wavefront aberration, corneal wavefront aberration, Zernike coefficient, aberration coefficient, Strehl ratio, white light MTF, Landolt's ring pattern, etc., as well as lens movement control unit 250, light source control unit 260, and aperture shape A control signal is sent to the control unit 270, which will be described later in detail.
[0040]
The lens movement control unit 250 controls the first movement unit 110, the second movement unit 120, and the third movement unit 139 based on the control signal from the optical property calculation unit 200, respectively. (1) The light receiving optical system 20 and the correction lens 138 are moved. The light source control unit 260 is configured to control the first light source unit 11, the second light source unit 72, the third light source unit 31, the fourth light source unit 51, the fifth light source unit 55, and the refraction based on a control signal from the optical property calculation unit 200. An on / off signal may be sent to the force measurement light source 81 and the optotype presenting light source 131, and if necessary, a light quantity control signal for adjusting brightness may be sent.
[0041]
The aperture shape control unit 270 sends a control signal of the aperture shape to the light flux limiting unit 134 based on the control signal from the optical characteristic calculation unit 200. The display unit 280 displays the optical characteristics calculated by the optical characteristic calculation unit 200, and for example, a CRT, a liquid crystal display, a plasma display, or the like is used. The details of the display mode on the display unit 280 are disclosed in, for example, JP-A-2002-209854, and the detailed description thereof is omitted here by using the description of the patent publication.
[0042]
FIG. 3 is a configuration block diagram illustrating details of the optical property calculation unit 200. The optical characteristic calculation unit 200 includes a correction lens for calculating an aberration of an eye such as a crystalline lens and a retina, a calculation function of an anterior segment aberration such as a cornea, a calculation function of a refractive power, and a function of cooperating with the optotype presenting unit 130. 138 and an output function of an adjustment signal of the light flux limiting unit 134, and an adjustment function when the pupil shape is different from that of a normal eye.
[0043]
The eye aberration calculation function is achieved by the Hartmann image storage unit 202, the eye aberration calculation unit 204, the total eyeball aberration data 205, the high order eyeball data 206, and the low order eyeball data 207. The Hartmann image storage unit 202 stores an image signal of the first light receiving unit 23 of the first light receiving optical system 20. The eye aberration calculator 204 calculates the eye aberration as, for example, a spherical component, an astigmatism component, a coma aberration, a sagittal aberration, and a residual aberration. For the calculation, for example, a Zernike polynomial is used (see, for example, JP-A-2002-209854). The ocular total aberration data 205 includes all aberrations of the eye under measurement, including low-order aberrations and high-order aberrations, as wavefront aberrations. For example, the third-order spherical aberration, the fifth-order spherical aberration, the seventh-order spherical aberration, the third-order coma aberration, the sagittal aberration, the fifth-order coma aberration, the third-order astigmatism (astigmatism component), And fifth-order astigmatism. The eyeball low-order aberration data 207 corresponds to secondary spherical aberration.
[0044]
The anterior ocular segment aberration calculation function is achieved by the Placido ring image storage unit 212, the corneal aberration calculation unit 214, and the higher order corneal aberration data 216. The placido ring image storage unit 212 stores the image signal of the second light receiving unit 35 of the second light receiving optical system 30. The corneal aberration calculation unit 214 calculates the corneal aberration as, for example, a spherical component, an astigmatic component, a coma aberration, a sagittal aberration, and a residual aberration using, for example, a Zernike polynomial. Preferably, in addition to the corneal high-order aberration data 216, corneal total aberration data and corneal low-order aberration data may be stored as data.
[0045]
The refractive power calculating function is based on a refractive power measuring ring-shaped pattern image projected on the retina based on the refractive power measuring light receiving signal sent from the refractive power measuring light receiving optical system 90, and is used as a refractive power calculating unit 240. Is used to determine the refractive power of the eye to be inspected 60.
[0046]
The function of outputting the adjustment signal of the correction lens 138 is performed by the correction amount calculation unit 275 and the lens movement control unit 250. That is, the correction amount calculation unit 275 calculates the correction amount of the eye 60 using the eyeball low-order aberration data 207 and the refractive power of the eye 60 obtained by the refractive power calculation unit 240 as necessary. Then, an adjustment signal output of the correction lens 138 is output to the lens movement control unit 250 so that the calculated correction amount is obtained.
[0047]
The function of outputting the adjustment signal to the light flux limiting unit 134 is performed by the anterior eye image storage unit 222, the high visual acuity contribution area extraction unit 226, and the aperture shape control unit 270. The anterior eye image storage unit 222 stores an image signal including the anterior eye part of the second light receiving unit 35 of the second light receiving optical system 30. The high visual acuity contribution area extraction unit 226 extracts a high degree of area that contributes to visual acuity from the pupil shape of the subject's eye 60 included in the anterior eye part signal stored in the anterior eye part image storage unit 222. The aperture shape control unit 270 restricts the light flux limiting unit 134 so as to limit the optotype luminous flux that presents the optotype to an area that contributes to the visual acuity extracted by the high visual acuity contribution area extraction unit 226. It outputs a shape control signal. For example, if liquid crystal is used as the light flux limiting unit 134, a liquid crystal driving circuit is used as the aperture shape control unit 270.
[0048]
The adjustment function when the pupil shape is different from that of a normal eye is performed by the pupil shape determination unit 224 and the signal selection unit 228. The pupil shape determination unit 224 determines the pupil shape of the subject's eye 60 by using, for example, an anterior segment signal stored in the anterior segment image storage unit 222. In the anterior segment image of the anterior segment signal stored in the anterior segment image storage unit 222, since the light amount difference between the inside and outside of the pupil is large, the edge can be easily detected. An area surrounded by the detected edges is a pupil shape (pupil shape). The signal selection unit 228 obtains optical characteristic data including higher-order aberrations of the subject's eye 60 based on the pupil shape determined by the pupil shape determination unit 224. Note that the signal selection unit 228 may be configured to obtain optical characteristic data including higher-order aberrations of the subject's eye 60 for the region extracted by the high visual acuity contribution region extraction unit 226 instead of the pupil shape determination unit 224.
[0049]
Further, the person in charge of the optometry may extract the region that contributes to the visual acuity from the pupil shape of the eye 60 to be examined. In this case, the man-machine interface function of the optical property calculation unit 200 is enhanced so that the person in charge of the optometry can determine an area of the eye 60 that is effective as a signal used in the optical property measurement processing of the eye 60. That is, the anterior eye part image display control unit 230 forms an anterior eye part image of the eye to be inspected based on the image signal of the second light receiving unit 35, and displays the anterior eye part image of the eye to be inspected formed on the display unit 280. The signal selecting unit 228 selects a region to be used for optical characteristic measurement processing of the eye to be inspected 60 by the person in charge of optometry based on the anterior eye image of the eye to be inspected formed on the display unit 280. The range of the image is instructed to the optical property calculation unit 200. The optical characteristic calculation unit 200 obtains optical characteristic data including higher-order aberrations of the eye to be inspected for an area used by the person in charge of the optometry for the optical characteristic measurement processing of the eye to be inspected 60.
[0050]
FIG. 4 is a flowchart showing an optical characteristic measuring process of the eye to be inspected using the optical characteristic measuring device 100 and the optical characteristic calculating unit 200 according to the present invention. Note that, for convenience of explanation, the description of the flowchart here is schematic, and a specific description will be given later. First, the optometrist turns on the optotype presenting light source 131 via the light source control section 260 (S10). Then, alignment adjustment is performed using the second light receiving optical system 30 and the third illumination optical system 75 (S12). Then, an image of the anterior segment of the subject's eye is photographed using the second light receiving optical system 30, and is recorded in, for example, the anterior segment image storage unit 222 (S14). Then, the pupil shape determination unit 224 or the high visual acuity contribution region extraction unit 226 specifies a region to be used for the optical characteristic measurement process of the subject's eye 60 (S16). If the pupil shape is that of a healthy eye, the pupil may be detected.
[0051]
Then, in order to perform subjective optometry using the optotype presenting unit 130, the optotypes of the visual acuity table are switched (S18). The optotype plate 133 is for selectively presenting a low-order aberration visual acuity chart and a high-order aberration visual acuity chart, and is used as an optotype of a visual acuity table by appropriately switching either one.
[0052]
Next, the liquid crystal constituting the light beam restricting unit 134 is driven to determine the range of the pupil on which the optotype presented by the optotype presenting unit 130 is projected (S20). Further, the liquid crystal forming the diaphragm 14 is driven to determine the range of the pupil for measuring the reflected light from the retina of the subject's eye 60 as a Hartmann image. For example, the diameter is about 3 mm for a pupil in a bright field, and the diameter is about 7 mm for a pupil in a dark field.
[0053]
Then, the ocular aberration of the eye to be inspected 60, which is the measurement target, is calculated (S22). That is, the optical property calculation unit 200 acquires a Hartmann image from the first light receiving unit 23, and calculates the Zernike coefficient based on the distance and coordinates between the Hartmann plate 22 and the first light receiving unit 23 which are numerical data on the Hartmann image. Is calculated. At this time, the examiner, the pupil shape is input by the pupil shape determination unit 224 or the high visual acuity contribution area extraction unit 226, and the signal selection unit 228 calculates the eyeball aberration of the subject's eye based on the input pupil shape. Area is determined.
[0054]
In the optical characteristic calculation unit 200, the spherical power S, the astigmatic power C, and the astigmatic axis A of the eye 60 are measured based on the Zernike coefficients obtained in S22 (S24). The unit of the spherical power S is a diopter value, which is basic data used for vision correction. As for the corneal aberration measurement, the optical characteristic calculation unit 200 calculates a Zernike coefficient based on a displacement amount or the like due to distortion of the Placido ring image. Then, based on the measured spherical power S, astigmatic power C, and astigmatic axis A of the subject's eye 60, an adjustment signal output of the correction lens 138 is output from the lens movement control unit 250 so that the correction signal is adapted to the subject's eye 60. The correction lens 138 is adjusted. When correcting astigmatism of the eye to be inspected, a variable cross cylinder (not shown) is adjusted.
[0055]
Next, the examiner selects a target to be presented to the subject, and the subject responds to the target viewed by the subject's eye 60, thereby performing subjective optometry (S26). For example, in the Landolt ring, if the subject answers the direction of the missing portion of the ring (for example, up, down, left, right) and matches the optotype presented by the examiner, the examiner It is determined that it is visible with the subject's eye 60. At this time, the examiner, the pupil shape determination unit 224 or the high visual acuity contribution region extraction unit 226 extracts the central part of the pupil, and the light flux control unit 134 forms a shape similar to the extracted region. A shape control signal is sent from the aperture shape control unit 270.
[0056]
Then, it is determined whether or not the visual acuity value of the subject's eye 60 by the subjective optometry has reached, for example, 0.7 which is a reference value in a car driving license (S28). In S28, the contrast sensitivity may be used as the reference value, and the spatial frequency may be used as a specific mode. In S28, if the visual acuity value of the eye to be inspected 60 has not reached the reference value, the examiner, the central part of the pupil extracted by the pupil shape determining unit 224 or the high visual acuity contribution region extracting unit 226 in S22 and S26 is appropriate. Assume that it did not exist. Therefore, the examiner, the pupil shape determining unit 224 or the high visual acuity contribution region extracting unit 226 extracts the center region (including the selection of the center position and the inner diameter) of the pupil to be the next candidate as the central portion of the pupil, and re-examines the eyeball. The aberration, the corneal aberration, and the visual acuity value of the subject's eye 60 by the subjective optometry are measured.
[0057]
Specifically, the pupil of the subject's eye 60 is displayed on the display unit 280 (S30), and the examiner inputs the pupil shape (S32). Then, returning to S20, the liquid crystal forming the light flux restricting unit 134 is driven so as to conform to the input pupil shape, and the range of the pupil on which the target presented by the target presenting unit 130 is projected is determined ( S20).
[0058]
On the other hand, when the judgment value of the eye to be examined 60 has reached the reference value in S28, the central part of the pupil extracted by the examiner, the pupil shape determination unit 224 or the high visual acuity contribution region extraction unit 226 is appropriate. Therefore, various data obtained in S22, S24, and S26 for the subject's eye 60 are printed (S34). The various data can be collectively or selectively displayed graphically on the display unit 280. Then, the measurement for the subject's eye 60 this time ends (S36).
[0059]
Next, with reference to FIG. 4, a description will be given of a measuring method when measuring the eyeball aberration and the corneal aberration of the subject's eye using the optical property measurement device 100 and the optical property calculation unit 200 of the present invention. In the case of a healthy eye with a pupil shape close to a perfect circle, it is sufficient to measure eyeball aberration and corneal aberration around the optical axis determined by the pupil shape by correcting the visual acuity by the optotype presenting unit 130. However, in cataract patients and myopic correction patients who have performed refractive surgery, the pupil shape may be greatly distorted with respect to the perfect circle, and the pupil shape must determine the pupil region that uniquely contributes to visual acuity. Can not. That is, the reference value of the visual acuity cannot be satisfied in S28.
[0060]
Therefore, the examiner performs a subjective optometry using the optotype presenting unit 130 on the central part of the pupil extracted by the pupil shape determining unit 224 or the high visual acuity contributing region extracting unit 226, and the visual acuity reference is made in S28. The pupil center portion when the value is satisfied is determined (S32). Then, the eyeball aberration and the corneal aberration of the subject's eye are measured by the objective optometry using the optical property measurement device 100 and the optical property calculation unit 200 for the central part of the pupil when the reference value of the visual acuity is satisfied in S28. I do. When the pupil shape is greatly distorted with respect to the perfect circle in this way, by using the subjective optometry, the objective optometry, and the pupil shape determination unit 224 or the high visual acuity contribution region extraction unit 226, the eyeball can be adjusted with respect to an appropriate region of the pupil. Aberration and corneal aberration can be measured.
[0061]
Next, further details of the configuration of the eye characteristic measuring apparatus of the present invention will be described. FIG. 5 is a configuration diagram illustrating the eye to be examined, the Placido ring, and the second light receiving optical system. The distance of the outer circle of the placido ring 71 from the optical axis is H2, and the distance of the inner circle from the optical axis is H1. The Placido ring 71 is projected onto the eye 60 to be inspected, and a reflection image of the Placido ring 71 is formed on the retina 61 of the eye 60 to be inspected. Then, an image is formed on the second light receiving unit 35 of the second light receiving optical system via the afocal lens 42 of the common optical system. As the second light receiving unit 35, a light receiving element such as a CCD is used, for example, and a reflection image of the Placido ring 71 of the retina 61 forms an outer circle at a position h2 from the optical axis and an inner circle at h1. An aperture 36 is appropriately inserted between the afocal lens 42 and the second light receiving unit 35 to prevent stray light from entering.
[0062]
FIG. 6 is an explanatory diagram of a Placido ring image formed on the second light receiving unit. In the Placido ring image, a pupil and a bright spot image appear, and a multiple ring of marks and a Placido ring appears. The anterior segment of the subject's eye 60 is illuminated by the light beam from the third light source unit 31 via the third illumination optical system 75, and the pattern of the placido ring 71 (multiple rings) is transmitted via the second illumination optical system 70. It is illuminated. Therefore, on the screen constituting the second light receiving unit 35, the mark formed on the screen is displayed by being superimposed on the bright spot image by the luminous flux from the third light source unit 31 together with the multiplex ring. . When the alignment is shifted, the center of the mark and the bright spot image are shifted. Therefore, the position of the apparatus is adjusted up, down, left, and right as needed to adjust the center of the mark to coincide with the bright spot image, thereby completing the alignment.
[0063]
7A and 7B are explanatory diagrams of the beam splitter 45. FIG. 7A is a main part optical path diagram, FIG. 7B is a light source side light incident surface, and FIG. 7C is a light receiving unit side light exit surface. In the beam splitter 45, a light source side light incident surface 45a of the light beam 15 and a light receiving portion side light emitting surface 45b of the light beam 24 are formed, and a light transmitting surface 45c is formed on a side facing the eye 60 to be inspected. The light source side light incident surface 45a has a light transmitting portion 45a1 having a relatively small diameter provided near the optical axis and a light shielding portion 45a2 provided on the outer periphery of the light transmitting portion 45a1. The light emitting surface 45b on the light receiving portion side has a light transmitting portion 45b1 having a relatively large diameter provided near the optical axis and a light shielding portion 45b2 provided on the outer periphery of the light transmitting portion 45b1. The light-shielding portions 45a2 and 45b2 are formed by vapor-depositing or applying a light-shielding material, for example, silver on the side surface of the beam splitter 45.
[0064]
FIGS. 8A and 8B are views for explaining the details of the Hartmann plate 22 and the first light receiving unit 23, wherein FIG. 8A is a perspective view and FIG. The Hartmann plate 22 converts the reflected light flux from the eye 60 to be examined into at least 17 beams, and converts the spherical component, the third-order astigmatism, the Zernike third-order and fourth-order high-order aberrations of the eye 60 to be measured. This is a wavefront conversion member for measurement. Here, the Hartmann plate 22 is formed with, for example, 5 × 5 rows of micro Fresnel lenses arranged in a plane orthogonal to the optical axis. As the first light receiving unit 23, a light receiving element such as a CCD is used. In the first light receiving unit 23, when the subject's eye 60 has no aberration, each bright point of the micro Fresnel lens is projected on a lattice point (reference point). However, as shown in FIG. 8B, when the subject's eye 60 has an aberration, each bright point of the micro Fresnel lens is projected at a position shifted from the lattice point (reference point). Therefore, the aberration existing in the subject's eye 60 is calculated from the positional shift amount. Note that FIG. 8B shows a single bright spot, and other bright spots corresponding to 5 × 5 rows of micro Fresnel lenses are omitted.
[0065]
9A and 9B are explanatory diagrams when the pupil shape is greatly distorted with respect to a perfect circle. FIG. 9A shows an anterior eye image of the second light receiving unit, and FIG. 9B shows an aperture shape of the light beam restricting unit by the aperture shape control unit. Represents. When the subject's eye 60 is undergoing refractive surgery, for example, the pupil shape is greatly deviated from a perfect circle like a water drop shape or an elliptical shape. The wavefront shape in the region near the center of the pupil contributes to visual acuity, but the wavefront shape in the peripheral region where the pupil is distorted is considered to have a small contribution to visual acuity. Since the visual acuity is obtained by sensing the image formed on the retina with the optic nerve cells, the luminous flux incident on the central part of the pupil occupies a large proportion as the retinal image. Therefore, in subjective optometry, even if the pupil shape is greatly distorted relative to a perfect circle, the peripheral area where the pupil is distorted is excluded and the visual target is displayed at the center of the pupil to measure the visual acuity. It is important to do it. That is, in the subjective optometry, the examiner or the high visual acuity contribution area extracting unit 226 inputs an aperture shape instruction signal to the aperture shape control unit 270, and the aperture shape control unit 270 presents an optotype by the light flux control unit 134. Is limited to the center of the extracted pupil.
[0066]
10A and 10B are explanatory diagrams of a Hartmann image when the pupil shape is greatly distorted with respect to a perfect circle. FIG. 10A illustrates a Hartmann image of the second light receiving unit, and FIG. 10B illustrates an eyeball aberration selected by the aperture shape control unit. The area to be measured is shown. In the calculation of eye aberrations and corneal aberrations, even if the pupil shape is greatly distorted relative to a perfect circle, exclude the peripheral region where the pupil is distorted and measure the wavefront shape at the center of the pupil. Is essential.
[0067]
Therefore, the examiner, the pupil shape determining unit 224 or the high visual acuity contributing region extracting unit 226 extracts the central part of the pupil, and performs an operation to obtain the eyeball aberration and the corneal aberration in the extracted region. Typically, an area to be illuminated by the first illumination optical system is limited to the central portion of the extracted pupil, or an area to be received by the first light receiving unit or the second light receiving unit is limited to an area to be processed. Then, the examiner, pupil shape determination unit 224 or high visual acuity contribution area extraction unit 226 instructs an aperture shape instruction signal for an aperture (not shown) provided in the first illumination optical system, the first light receiving unit or the second light receiving unit. I do.
[0068]
11A and 11B are diagrams illustrating an example of a contrast sensitivity target presented by the target presenting unit 130. FIG. 11A is a plan view of Gabor stimulation projected on the anterior eye of the subject, and FIG. 3A shows a contrast chart luminance profile in the BB direction of the plan view of FIG. The peak interval d of the luminance profile corresponds to the spatial frequency. When the contrast is 100%, the test target TM using Gabor stimulation is used. ₁₀₀ Pedestal target PM ₁₀₀ Is about 0.08, which is the minimum value of the Gabor stimulus. On the other hand, when the contrast is 50%, the test target TM using Gabor stimulation is used. ₅₀ Luminance amplitude of test target TM ₁₀₀ Since it is smaller, the pedestal target PM ₅₀ Is about 0.28, which is the minimum value of the Gabor stimulus. Details of the contrast sensitivity target are omitted, for example, with reference to the disclosure of Japanese Patent Application No. 2001-401812.
[0069]
In the above-described embodiment, first, the eyeball aberration and the corneal aberration of the subject's eye are measured by the objective optometry, and then the subjective optometry is used to determine whether the eyesight of the subject's eye has reached the reference value. Although it is determined whether the pupil region for measuring the eyeball aberration and the corneal aberration of the optometry is appropriate, the order of the objective optometry and the subjective optometry in the eye characteristic measuring apparatus of the present invention may be reversed. That is, first, a region where the eyesight of the subject's eye reaches the reference value is determined by subjective optometry, and then, with respect to the pupil region where the eyesight of the subject's eye reaches the reference value, ocular aberration and corneal aberration of the subject's eye are determined. May be measured by objective optometry.
[0070]
【The invention's effect】
As described above, according to the eye characteristic measuring apparatus of the present invention, the light beam restricting unit restricts the light beam according to the pupil shape of the subject's eye, and projects the optotype by the optotype presenting unit. The eyesight can be measured from the response of the subject. Since the second light receiving optical system receives the reflected light beam from the anterior segment of the eye to be examined and forms an anterior segment signal, the pupil shape of the eye to be examined is used as a reference when the target is deformed into a predetermined light beam shape. Is obtained. Since the light beam illuminated from the first illumination optical system is reflected from the eye to be inspected and received by the first light receiving unit, the optical characteristic calculation unit uses the output of the first light receiving unit to perform optics including higher order aberrations of the eye to be inspected. Find characteristic data. In the optical characteristic calculation unit, for example, by using the anterior segment signal of the second light receiving optical system, by determining the pupil region of the eye to be searched for optical characteristic data including higher-order aberrations of the eye to be examined, the pupil shape of the eye to be examined A pupil region for obtaining an adapted eyeball aberration can be set.
[0071]
Further, when performing eye characteristic measurement using the eye characteristic measurement device of the present invention, information obtained when the subjective visual acuity is obtained using the optotype presenting unit and the light flux limiting unit, for example, according to the pupil shape of the eye to be examined Using the restricted light beam shape, it is possible to set a pupil region when performing eyeball and corneal aberrations of the subject's eye, which is objectively determined by the optical property calculation unit, thereby improving measurement accuracy of eyeball and corneal aberrations. . In particular, when a high pupil region and a low pupil region contributing to visual acuity coexist, such as an eye under refraction surgery, the visual acuity is used as a measurement region for optical characteristic data including higher-order aberrations of the eye. It is possible to select a pupil region having a high degree of contribution.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an optical characteristic measuring apparatus 100 according to the present invention, showing a schematic configuration of an optical system and an arithmetic control unit.
FIG. 2 is a configuration diagram illustrating an example of a placido ring 71.
FIG. 3 is a configuration block diagram illustrating details of an optical characteristic calculation unit 200.
FIG. 4 is a flowchart showing an optical characteristic measuring process of an eye to be inspected using the optical characteristic measuring device 100 and the optical characteristic calculating unit 200 according to the present invention.
FIG. 5 is a configuration diagram illustrating an eye to be examined, a Placido ring, and a second light receiving optical system.
FIG. 6 is an explanatory diagram of a Placido ring image formed on a second light receiving unit.
FIGS. 7A and 7B are explanatory diagrams of the beam splitter 45, wherein FIG. 7A is a main part optical path diagram, FIG. 7B is a light source side light incident surface, and FIG.
FIG. 8 is a diagram illustrating details of a Hartmann plate 22 and a first light receiving unit 23;
FIG. 9 is an explanatory diagram when the pupil shape is greatly distorted with respect to a perfect circle.
FIG. 10 is an explanatory diagram of a Hartmann image when a pupil shape is greatly distorted with respect to a perfect circle.
11 is a diagram illustrating an example of a contrast sensitivity target presented by the target presenting unit 130. FIG.
[Explanation of symbols]
10 First illumination optical system
20 First light receiving optical system
30 Second light receiving optical system
40 common optical system
50 Adjustment optical system
60 Eye to be examined
70 Second illumination optical system
75 Third illumination optical system
80 Illumination optical system for refractive power measurement
90 Reception optical system for refractive power measurement
100 Optical property measuring device
130 Optotype presenting section
200 Optical property calculator
224 pupil shape determination unit
226 High visual acuity contribution area extraction unit
228 signal selector
240 refractive power calculation unit
250 Lens movement control unit
260 light source controller
270 Aperture shape control unit
275 Correction amount calculation unit
280 display

Claims (7)

A first illumination optical system for causing a light beam to enter the eye to be inspected;
A first light receiving optical system including a first light receiving unit that receives reflected light from the subject's eye;
An optical property calculation unit for obtaining optical property data including higher-order aberrations of the eye to be inspected based on the output of the first light receiving unit;
A second light receiving optical system including a second light receiving unit that receives a reflected light beam from the anterior segment of the subject's eye and forms an anterior segment signal;
An optotype presenting section for presenting via a luminous flux restricting section that transforms the subjective optometric optotype into the predetermined luminous flux shape and enters the optometric target for the subject's eye;
An eye characteristic measuring device comprising: The first illumination optical system is formed so as to illuminate a minute area on the retina of the subject's eye with a light beam from a first light source unit;
The first light receiving optical system is formed to guide the light beam reflected by the retina of the eye to be examined to the first light receiving unit via a first conversion member that converts the light beam into at least substantially 17 beams. ;
The optical property calculation unit obtains optical property data including higher-order aberrations of the subject's eye using the reflected light beam converted into the beam;
The eye characteristic measuring device according to claim 1. The target presenting unit presents at least one of a general visual acuity chart and a contrast chart;
The eye characteristic measuring device according to claim 1 or 2. A high visual acuity contribution region extracting unit that extracts a region that is highly contributing to visual acuity from the pupil shape of the subject's eye included in the anterior segment signal;
The luminous flux restricting unit of the optotype presenting unit restricts the optotype luminous flux such that the subjective optometric optotype is presented in a region that is highly contributing to the visual acuity extracted by the high visual acuity contributing region extracting unit. Formed to
The eye characteristic measuring device according to claim 1. A pupil shape determination unit that determines a pupil shape based on an anterior eye image of the subject's eye obtained by the second light receiving unit;
The optical property calculation unit is configured to obtain optical property data including higher-order aberrations of the subject's eye based on the pupil shape determined by the pupil shape determination unit;
The eye characteristic measuring device according to claim 1. Further, the optotype presenting unit includes a correction optical system;
The correction optical system is configured to perform correction of the subject's eye according to low-order aberrations of the subject's eye measured by the optical property calculation unit;
The eye characteristic measuring device according to claim 1. A display unit that forms an anterior segment image of the subject's eye based on a signal from the second light receiving unit;
A selector configured to select a signal used for optical characteristic measurement processing of the eye to be examined by the optical characteristic calculator from a signal from the first light receiving unit;
The selection unit selects a signal of a selected region based on the eye image formed on the display unit;
The optical property calculation unit is configured to obtain optical property data including higher-order aberrations of the subject's eye based on the subject's eye image signal selected by the selection unit;
The eye characteristic measuring device according to claim 1.

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