JP3594390B2 - Ophthalmic measurement device - Google Patents

Description

の式で表され、この式中のＩ_ｆ（凝集していない粒子からの散乱光強度）とＩ_ｓ（凝集している粒子からの散乱光強度）の割合（量）から水晶体内部の蛋白質組成が算出される。
【００４３】
得られた測定結果は、制御装置７３に送られビデオグラフィック回路７５、画像合成・切換装置７２を介してテレビモニタ６に表示されるとともに、記憶装置７６に記憶される。また、測定時における断面画像（必要なら正面画像も）の静止画、測定部位の設定基準位置からの偏位情報（座標位置デ−タ）、及び被検者のＩＤ番号や年齢などの入力デ−タも同時に記憶装置７６に記憶される。記憶装置７６に記憶した測定結果や断面画像の情報は、出力装置８５によりプリントアウト（あるいはコンピュ−タ等へデ−タ転送）することができる。
【００４４】
経時変化等を調べる再測定時には、患者のＩＤ番号をなどを入力装置８４で入力指定して、記憶装置７６に記憶された前回の測定部位の座標位置デ−タや断面撮影画像等を呼び出し、これをアライメントに使用する。例えば、正面観察像による上下左右のアライメントを完了させた後、入力装置８４に設けられた画像表示切換えスイッチを操作して、テレビモニタ６上の左半分に前回測定時の断面画像を表示させ、右半分には現在測定の断面画像を表示させる。検者は両者の画面を比較観察しながら、現測定側のレ−ザ収束位置やレチクル像の位置が前回のものと同じになるように装置を移動する。これにより、前回と同一の測定部位に極めて容易にアライメントすることができる。テレビモニタ６の画面上で比較する代わりに、前回測定時の断面画像を別の表示モニタに表示させても良いし、プリントアウトした画像を使用しても良い。
【００４５】
また、前回の測定部位の基準位置に対する偏位情報を併用すると、さらに正確なアライメントを行うことができる。例えば、呼び出した前回測定部位の座標位置デ−タをテレビモニタ６に表示する。再測定時には前回期測定時と同様に、まず、テレビモニタ６に映し出されたアライメント輝点がレチクル中央にフォーカスするように行い、基準位置設定スイッチを押して基準位置を再定義し、テレビモニタ画面の座標位置デ−タ９５をリセットする。その後、テレビモニタ６を見ながら現測定の座標位置デ−タが前回の座標位置デ−タと同じになるようにジョイスティック５を操作して装置を移動することにより、前回と同一の測定部位にアライメントすることができる。
【００４６】
以上の実施例では、一つのモニタに正面像と断面像とを同時に表示するようにしたが、切り換えスイッチ等によりこれらを切り換えるようにしても良い。また、別のモニタに表示させても良い。
【００４７】
【発明の効果】
以上説明したように、本発明によれば、前眼部各層の層分けが特定でき、各層に対する測定部位の把握を極めて容易に行うことができる。
また、再測定時における測定部位の再現性を確保することができ、正確な経時変化の測定を可能にすることができる。
【図面の簡単な説明】
【図１】実施例の装置の外観略図を示す図である。
【図２】ジョイスティックによる移動機構を説明する図である。
【図３】実施例の装置の光学系要部構成を示す図である。
【図４】実施例の装置の制御系要部構成を示す図である。
【図５】テレビモニタに表示される画面の一例を示す図である。
【符号の説明】
６ テレビモニタ
１０ レーザ照射系
２０ レーザ散乱光検出系
２３ シャッター板
３０ 正面観察系
５０ スリット投影系
６０ スリット断面撮影系
６６ レチクル板
７２ 画面合成・切換装置
７６ 記憶装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an ophthalmologic measurement apparatus that irradiates a laser beam toward an eyeball of a subject's eye, and detects and analyzes laser scattered light inside the eyeball with a photoelectric conversion element to measure the state of the eyeball.
[0002]
[Prior art]
2. Description of the Related Art There is known a measuring device that irradiates a laser beam toward an eye to be examined while converging a laser beam from an oblique direction, and detects and analyzes scattered light caused by particles in a crystalline lens and anterior chamber to inspect an internal state. An apparatus for measuring and analyzing the state of protein particles inside the lens is effective for early detection and diagnosis of cataract.
[0003]
Conventionally, alignment to a measurement site in this type of apparatus has been performed by observing an eye to be inspected from the optical axis direction of a light receiving optical system that receives scattered light, and moving a convergence position of a measurement light beam to a desired measurement position.
Further, a device having an optical system for observing the subject's eye from the front is also known.
[0004]
[Problems to be solved by the invention]
However, a device for observing the eye to be inspected from the optical axis direction of the light receiving optical system cannot obtain a high quality observation image only with the laser light for measurement. In addition, since the image is formed by laser light emitted from an oblique direction of the eyeball and is not a cross-sectional image in the visual axis direction (or a direction parallel to the visual axis), a multilayer such as a sac, cortex, adult nucleus, fetal nucleus, etc. It is not enough to grasp the laser beam irradiation site on the crystalline lens having the structure.
[0005]
Further, there is a problem that it is difficult to identify each of the layers of the crystalline lens and to grasp the measurement site for each of the layers only by observation from the front or the vicinity thereof.
[0006]
The present invention has been made in view of the above problems, and has as its technical object to provide an ophthalmologic measurement apparatus that can specify the layer division of each layer of a crystalline lens and can easily grasp a measurement site for each layer.
It is another technical object of the present invention to provide an ophthalmologic measuring apparatus capable of ensuring reproducibility of a measurement site at the time of re-measurement.
[0007]
[Means for Solving the Problems]
The present invention is characterized by having the following configuration to achieve the above object.
(1) An ophthalmology including a laser projection optical system that converges and projects a laser beam toward the anterior segment of the eye to be inspected, and a scattered light detection optical system that detects scattered light by anterior eye tissue caused by the laser beam. In the measurement device, a slit projection optical system that projects slit light onto the eye to be inspected, a cross-section imaging unit that captures an anterior eye section light-cut by the slit projection light based on the Scheimpflug principle, and the cross-section imaging unit And a reticle forming means for forming a reticle image for specifying a measurement site for displaying a cross-sectional image by the cross-sectional image display means, and a convergence position of a laser beam. Can be observed in an anterior segment cross-sectional image.
[0008]
(2) An ophthalmology including a laser projection optical system that converges and projects a laser beam toward the anterior segment of the subject's eye, and a scattered light detection optical system that detects scattered light by the anterior eye tissue caused by the laser beam. In the measurement device, a slit projection optical system that projects slit light onto the eye to be inspected, a cross-section imaging unit that captures an anterior eye section light-cut by the slit projection light based on the Scheimpflug principle, and the cross-section imaging unit A cross-sectional image display means for displaying a cross-sectional photographed image according to the present invention, wherein the convergence position of the laser beam can be observed in the anterior ocular segment cross-sectional image, and a reference position setting means for setting a reference position with respect to the eye to be inspected; Moving means for moving the apparatus with respect to, a deviation detecting means for detecting a deviation from the reference position by the moving means, and a notifying means for notifying an examiner of detection information by the deviation detecting means, Preparation Characterized in that that.
[0015]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[overall structure]
FIG. 1 is a schematic view showing the appearance of an apparatus for examining the protein composition inside a lens according to an embodiment.
[0016]
Reference numeral 1 denotes a base, on which a chin rest 2 for fixing an eye to be examined is fixed. Reference numeral 3 denotes a main body, reference numeral 4 denotes a measuring unit that houses an optical system described later, and reference numeral 5 denotes a joystick for moving the main body 3 and the measuring unit 4. By operating the joystick 5, the main unit 3 moves up and down and left and right on the horizontal plane of the base 1, and the measuring unit 4 moves up and down with respect to the main unit 3. The movement of the main body 3 with respect to the base 1 includes a spherical portion and a lower end formed below the axis of the joystick 5, a sliding plate whose lower end swings, and affixed to the base 1 in contact with the sliding plate. Due to the friction plate thus formed and the configuration of the ball bearing inside the housing 3a integrated with the main body 3, fine movement in the horizontal direction is realized. The vertical movement of the measuring unit 4 with respect to the main body 3 is controlled by a rotation knob 5a on the outer periphery of the joystick, a slit plate rotating with the rotation knob 5a, and a light source and a light receiving element provided on a shaft with the slit plate interposed therebetween. The rotation direction and the amount of rotation of the rotary knob 5a are detected from the signal of the element, and the motor for raising and lowering the measuring section 4 is driven and controlled based on the detection result (see FIG. 2). The details of this joystick mechanism are described in Japanese Patent Application Laid-Open No. 6-7292 filed by the present applicant. Reference numeral 6 denotes a television monitor that displays an observation image for alignment and information to notify the examiner.
[0017]
[Configuration of each part]
Optical system FIG. 3 is a diagram showing a configuration of a main part when the optical system of the apparatus is viewed from above.
<Laser beam irradiation system> 10 is a laser irradiation system, L ₁ denotes the optical axis. Laser irradiation optical axis L ₁ is - a laser light from obliquely lens 15 to allow light projection is inclined to about 20 degrees to the optical axis L ₀ of the front observation system which will be described later. Reference numeral 11 denotes a laser light source that emits laser light for measurement. The laser light source 11 uses a diode laser that emits laser light having a wavelength of 670 nm. Reference numeral 12 denotes an expander lens, and reference numeral 13 denotes a light projecting lens.
[0018]
<Le - The scattered light detecting system> 20 Les - a The scattered light detecting system, L ₂ denotes the optical axis. Optical axis L ₂ intersects with the optical axis L ₁ and the optical axis L _0, the intersecting angle of the optical axis L ₂ and the optical axis L ₁ is preferably employed 40 degrees back and forth. On the optical axis L ₂ includes an imaging lens 21, an aperture 22 for limiting the incident beam, the shutter plate 23, PMT to detect a very small scattered light of the laser light by the molecules in the crystal body portion (photomultiplier tube) 24 are arranged.
[0019]
<Front observation system> 30 is a front observation system, on the optical axis L ₀ of the front observation system, CCD camera having sensitivity beam splitter 31, a photographing lens 33, a beam splitter 34 and the visible region to the infrared region 35 are arranged. Reference numeral 36 denotes an illumination light source that emits near-infrared light for observing an anterior ocular segment of a subject's eye.
[0020]
<Fixation / Alignment Light Projection System> Reference numeral 40 denotes a point light source for alignment that emits light in an infrared region, and 41 denotes a fixation lamp that emits visible light. Reference numeral 42 denotes a cold mirror having a characteristic of transmitting infrared light and reflecting visible light, and reference numeral 43 denotes a collimator lens.
[0021]
The index light beam for alignment emitted from the point light source 40 passes through the cold mirror 42, is converted into a parallel light beam by the collimator lens 43, is reflected by the beam splitter 32, passes through the beam splitter 31, and is emitted to the eye to be examined. .
The light beam emitted from the fixation lamp 41 is reflected by the cold mirror 42, and then travels to the fundus of the eye via the collimator lens 43 and the beam splitters 32 and 31.
[0022]
<Front Observation Reticle Projection System> 45 is a reticle light source, 46 is a reticle plate on which a ring-shaped reticle mark (not shown) is formed, and 47 is a projection lens. The mark of the reticle plate 46 illuminated by the reticle light source 45 is projected by the projection lens 47 on the imaging surface of the CCD camera 35 by the beam splitter 34.
[0023]
<Slit projection system> 50 is a slit projection system for cross-sectional imaging, 51 is a slit illumination light source, 52 is a condenser lens, 53 is a wavelength selection filter for converting projection light into near infrared light, 54 is a slit plate, 55 is a shutter plate, 56 is a light projecting lens, and 57 is a plane mirror.
[0024]
The light emitted from the slit light source 51 is converged by the condenser lens 52, the wavelength of which is selected by the wavelength selection filter 53, and illuminates the slit plate 54. The slit light beam slit-restricted by the slit plate 54 passes through the shutter plate 55, is made coaxial with the optical axis L ₀ of the front observation system via the plane mirror 57 and the beam splitter 31 by the light projecting lens 56, and then measured. An image is formed at the anterior segment of the eye 15 to be examined, which is a substantially converging position of the laser beam. At this time, the slit light beam optically cuts the anterior segment including the crystalline lens 15 in the vertical direction.
[0025]
<Slit section photographing system> 60 is a slit section photographing system, L ₃ represents the optical axis. Optical axis L ₃ is is provided with an inclination angle of 45 degrees to the optical axis L ₀ of the front observation system, intersect at the same position as the optical axis L _2, L _1. Optical axis L ₃ shooting on the lens 61, the beam splitter 62, CCD camera 63 having sensitivity from the visible region to the infrared region is provided. The CCD camera 63 and the photographing lens 61 are based on the principle of Scheimpflug and are based on the extension of the imaging surface of the CCD camera 63 and the optical axis L ₀ (that is, before the eye is cut by the slit projection system in the vertical direction). The eyepiece section and the extension of the lens surface of the taking lens 61 are arranged so as to intersect at one point. In an embodiment, the imaging surface of the CCD camera 63 is arranged perpendicular to the optical axis L _3, are arranged tilting the imaging lens 61.
[0026]
65 is a reticle illumination light source, 66 is a reticle plate on which an aiming mark is formed, 67 is a projection lens, and the aiming mark of the reticle plate 66 illuminated by the illumination light source 65 is a beam splitter 62. Through the projection lens 67, the image is projected onto the imaging surface of the CCD camera 63.
Note that the reticle projection system for front observation and cross-sectional imaging in the above optical system can be omitted by electrically generating a reticle image on a display screen.
[0027]
Control system FIG. 4 is a diagram showing a main configuration of a control system of the apparatus.
Video signals from the CCD cameras 35 and 63 are taken into an image synthesizing / switching device 72 via A / D circuits 70 and 71, respectively. The image synthesizing / switching device 72 comprises a frame memory for taking in each image from the CCD cameras 35 and 63, a synchronization timing circuit, an image synthesizing circuit, an image switching circuit, and the like. It is displayed on the television monitor 6 via the / A circuit 74. A video graphic circuit 75 for generating characters and figures is connected to the image synthesizing / switching device 72. The image synthesizing / switching device 72 displays on the television monitor 6 a synthesized image of the images captured by the CCD cameras 35 and 63 and the character information, etc. Display the measurement results.
[0028]
Reference numeral 76 denotes a storage device that stores captured images, measurement results, and the like, and can use a storage medium such as a floppy disk in addition to a storage circuit.
An arithmetic circuit 80 performs a predetermined arithmetic process based on an output signal from the PMT 9 in order to check a state inside the lens.
Reference numeral 81 denotes a shutter drive device for opening and closing the shutter plate 23, and reference numeral 82 denotes a shutter drive device for opening and closing the shutter plate 55 of the slit light projection system.
[0029]
83a is an X-direction position detection device for detecting the position of the main body 3 in the left-right (X) direction with respect to the base 1, 83b is a Y-direction position detection device for detecting the position in the up-down (Y) direction, and 83c is front-rear (Z). This is a Z-direction position detecting device for detecting the position in the direction, and various kinds of detecting devices such as a potentiometer, an encoder, and an optical detecting means can be used as each position detecting device. The detection signal from each position detection device 83 is input to the control device 73, and the control device 73 performs a known process on these signals to obtain front-back, left-right, and up-down deviations with respect to a set reference position (described later).
[0030]
Reference numeral 84 denotes an input device having various switches for inputting data such as the ID number and age of the subject, a reference position setting switch for alignment, and reading data. An output device 85 outputs a measurement result and the like.
[0031]
The operation of the device having the above configuration will be described.
Power on the device and turn on each light source. The subject's eye is positioned at a predetermined position on the chin rest 2 and the fixation lamp 41 is gazed at. The laser light emitted from the laser light source 11 is once broadened by an expander lens 12 and is obliquely applied to an eye 14 to be inspected by a light projecting lens 13 so as to become a very fine convergent light at a measurement site. You.
[0032]
The anterior eye image of the subject's eye 14 illuminated by turning on the anterior eye illumination light source 36 is received by the CCD camera 35 via the front observation system together with the reticle image by the front reticle projection system, and is also received by the alignment projection system. The alignment light beam projected to the optometry forms an alignment bright point by corneal reflection, and the light beam of the alignment bright point goes back through the front observation system and enters the imaging surface of the CCD camera 35.
[0033]
On the other hand, the slit illuminated by the slit light source 51 of the slit projection system 50 is projected from the front of the eye to be examined, forms an image near the convergence position of the measurement laser light, and vertically cuts the anterior eye of the eye to be examined. I do. Since the projected slit light beam is converted into near-infrared invisible light by the wavelength selection filter 53, the light beam is projected without giving any uncomfortable feeling to the examinee's eye. The anterior segment cross-sectional image (molecule scattered light image by the slit light) cut by the slit light beam is captured by the CCD camera 63 together with the aiming mark of the reticle plate 66 via the slit cross-sectional imaging system 60. The slit cross-section imaging system 60 captures a light-cut image of the slit light entering the subject's eye from the front not with a side-by-side but with an oblique axis inclined at 45 degrees, but the imaging system is based on the principle of Scheimpflug. By arranging them, it is possible to capture an image in which the entire surface is in focus, almost in the same manner as from right beside.
[0034]
The video signals of the images captured by the CCD cameras 35 and 63 are input to an image synthesizing / switching device 72, and two photographed images are synthesized on the left and right sides of one screen under the control of the control device 73, and simultaneously displayed on the television monitor 6. You. FIG. 5 shows an example of the display. The left side of the screen is an image of the front anterior segment captured by the CCD camera 35 of the front observation system, 90 is an alignment bright spot, and 91 is a reticle image. The right side of the screen is an anterior segment cross-sectional image captured by the CCD camera 63 of the slit cross-section imaging system, and 92 is a reticle image. Reference numerals 93 and 94 denote measurement laser beams that are projected while converging from an oblique direction of the eye to be inspected. Since the measurement laser light only needs to be observed except during measurement, its output is suppressed to a level that does not impose a burden on the subject's eye 4 in accordance with the sensitivity of the CCD cameras 35 and 63 (using an optical element or the like). The intensity of the laser beam may be adjusted).
[0035]
The examiner operates the joystick 5 to move the measurement unit 4 relative to the subject's eye while observing the front image and the cross-sectional image of the anterior segment displayed on the television monitor 6, and performs alignment as follows. Do.
[0036]
First, while looking at the front image on the left side of the screen, the upper, lower, left, and right directions of the desired measurement site are determined with reference to the positional relationship between the alignment bright spot 90 and the reticle 91. When the left, right, up and down alignment by the front image is completed, alignment in the depth direction (Z direction) is performed while observing the cross-sectional image. Since a cross-sectional image cut in a direction substantially parallel to the visual axis direction is displayed on the television monitor 6, an approximate image of the anterior capsule, cortex, adult nucleus, peripheral embryo nucleus, central embryo nucleus, posterior capsule and the like of the lens is displayed. Can be specified, and measurement sites can be easily grasped. Since the measurement site of the apparatus is a position where the laser beam becomes an extremely fine convergent beam, the measurement site can be determined by observing the laser beam passing through the crystalline lens, and is further defined by following the reticle image 92. Can be determined.
[0037]
In addition, the alignment with the measurement site can use the deviation information by the position detection devices 83a, 83b, and 83c. In this case, do as follows. The examiner adjusts up, down, left, and right so that the alignment bright spot 90 is located at the center of the reticle 91 while looking at the front image on the left side of the screen. Next, front-back adjustment is performed so that the brightness of the alignment luminescent spot is maximized (focus is achieved). When the eye to be examined and the alignment bright point are in a desired state, a reference position setting switch provided on the input device 84 is pressed. The controller 73 takes this position as a reference position for the measurement site of the eye to be examined.
[0038]
After the reference position has been set, the joystick 5 is operated again to perform alignment with the intended measurement site. When the main unit 3 and the measuring unit 4 are moved, each of the position detection devices 83a, 83b, and 83c detects a deviation position in the left, right, up, down, and front and rear directions of the movement position with respect to the set reference position. Will be entered. The control device 73 performs a predetermined process on the input signal to obtain a coordinate position (x, y, z) of the movement position. The video graphic circuit 75 generates character information for display on the basis of the coordinate position data. The character information for display is generated via the image synthesizing / switching device 72 on the screen of the television monitor 6 like the coordinate data 95 shown in FIG. Is displayed in real time.
[0039]
As described above, the alignment of the measurement site can be utilized in combination with the deviation information based on the three-dimensional numerical data in addition to the cross-sectional observation, so that the measurement site can be more easily grasped and the alignment can be easily performed. .
[0040]
When the alignment with the intended measurement site is completed, the examiner presses the measurement start switch provided on the input device 84 to execute the measurement. Upon receiving a signal from the measurement start switch, the control device 73 operates the shutter driving device 81 to close the shutter plate 55 to cut off the slit projection light to the eye to be examined, and also operates the shutter driving device 82 to perform laser scattering. The shutter plate 23 of the light detection system is opened. By closing the shutter plate 55, the slit projection light is prevented from becoming noise light for detecting laser scattered light. Further, it is preferable to simultaneously turn off the illumination light source 36, the point light source 40 for alignment, and the fixation lamp 41 so that these lights do not enter the laser scattered light detection system. The slit projection light and the alignment light may be blocked by providing an infrared cut filter in the optical path of the laser scattered light detection system.
[0041]
When the shutter plate 23 is opened, scattered light (in the embodiment, back scattered light of approximately 140 degrees) caused by the protein particles at the measurement site due to the measurement laser light projected on the crystalline lens is transmitted to the aperture 22 by the imaging lens 21. Is condensed at the position, and passes through the shutter plate 23 which is opened for a predetermined measurement time, and enters the PMT 24. At the time of measurement, the output of the measurement laser light is increased in synchronization with the opening of the shutter plate 23 so that the PMT 24 can more easily detect weak scattered light.
[0042]
The scattered light incident on the PMT 24 is output as an electric signal corresponding to the intensity, and is input to the arithmetic circuit 80. The arithmetic circuit 80 performs a predetermined arithmetic process based on the input signal to obtain a correlation function of the temporal variation of the scattered light intensity, and obtains a measurement result of the protein composition inside the lens. For this measurement, as described in, for example, Japanese Patent Application Laid-Open No. Hei 6-505650 (title "Method and Apparatus for Detecting Cataract Occurrence"), the correlation function of the temporal variation of the scattered light intensity is:
(Equation 1)

Represented by the formula, the protein composition of the crystal body portion from the rate (amount) of the _(scattered light intensity from particles which are not agglomerated) I _f in formula and I _{s (scattered} light intensity from particles are agglomerated) Is calculated.
[0043]
The obtained measurement result is sent to the control device 73, displayed on the television monitor 6 via the video graphic circuit 75 and the image synthesizing / switching device 72, and stored in the storage device 76. In addition, a still image of a cross-sectional image (or a front image if necessary) at the time of measurement, deviation information (coordinate position data) from the set reference position of the measurement site, and input data such as the ID number and age of the subject. The data is also stored in the storage device 76 at the same time. The information on the measurement results and the cross-sectional images stored in the storage device 76 can be printed out (or transferred to a computer or the like) by the output device 85.
[0044]
At the time of re-measurement for examining a change over time, the patient's ID number or the like is input and designated by the input device 84, and the coordinate position data and the cross-sectional photographed image of the previous measurement site stored in the storage device 76 are called. This is used for alignment. For example, after completing the vertical and horizontal alignment based on the front observation image, the image display changeover switch provided on the input device 84 is operated to display the cross-sectional image of the previous measurement on the left half on the television monitor 6, The cross section image of the current measurement is displayed in the right half. While comparing and observing the two screens, the examiner moves the apparatus so that the laser convergence position on the current measurement side and the position of the reticle image become the same as the previous one. As a result, alignment can be performed very easily at the same measurement site as the previous measurement. Instead of making a comparison on the screen of the television monitor 6, the cross-sectional image at the time of the previous measurement may be displayed on another display monitor, or an image printed out may be used.
[0045]
Further, when the deviation information of the previous measurement site with respect to the reference position is used together, more accurate alignment can be performed. For example, the called coordinate position data of the previously measured part is displayed on the television monitor 6. At the time of re-measurement, as in the previous measurement, first, the alignment bright spot projected on the TV monitor 6 is focused on the center of the reticle, and the reference position setting switch is pressed to redefine the reference position. The coordinate position data 95 is reset. Thereafter, the user operates the joystick 5 and moves the apparatus while watching the television monitor 6 so that the coordinate position data of the current measurement becomes the same as the coordinate position data of the previous measurement. Can be aligned.
[0046]
In the above embodiment, the front image and the cross-sectional image are simultaneously displayed on one monitor. However, these may be switched by a switch or the like. Further, the information may be displayed on another monitor.
[0047]
【The invention's effect】
As described above, according to the present invention, the layering of each layer of the anterior segment can be specified, and the measurement site for each layer can be grasped very easily.
In addition, reproducibility of the measurement site at the time of re-measurement can be ensured, and accurate measurement of change with time can be performed.
[Brief description of the drawings]
FIG. 1 is a schematic view showing the appearance of an apparatus according to an embodiment.
FIG. 2 is a diagram illustrating a moving mechanism using a joystick.
FIG. 3 is a diagram illustrating a configuration of a main part of an optical system of an apparatus according to an embodiment.
FIG. 4 is a diagram illustrating a configuration of a main part of a control system of the apparatus according to the embodiment.
FIG. 5 is a diagram showing an example of a screen displayed on a television monitor.
[Explanation of symbols]
6 Television Monitor 10 Laser Irradiation System 20 Laser Scattered Light Detection System 23 Shutter Plate 30 Front Observation System 50 Slit Projection System 60 Slit Cross Section Imaging System 66 Reticle Plate 72 Screen Synthesis / Switching Device 76 Storage Device

Claims (2)

An ophthalmologic measurement apparatus including a laser projection optical system that converges and projects laser light toward the anterior segment of the eye to be inspected, and a scattered light detection optical system that detects light scattered by anterior eye tissue by the laser light A slit projection optical system that projects slit light onto the subject's eye, a cross-section imaging unit that captures a section of the anterior eye part light-cut by the slit projection light based on the Scheimpflug principle, and a cross-section imaging using the cross-section imaging unit A cross-sectional image display means for displaying an image, and a reticle forming means for forming a reticle image for specifying a measurement site with respect to the display of the cross-sectional image by the cross-sectional image display means ; An ophthalmologic measurement apparatus characterized by being observable in a partial cross-sectional image. An ophthalmologic measurement apparatus including a laser projection optical system that converges and projects laser light toward the anterior segment of the eye to be inspected, and a scattered light detection optical system that detects light scattered by anterior eye tissue by the laser light A slit projection optical system that projects slit light onto the subject's eye, a cross-section imaging unit that captures a section of the anterior eye part light-cut by the slit projection light based on the Scheimpflug principle, and a cross-section imaging using the cross-section imaging unit A cross-sectional image display means for displaying an image, the convergence position of the laser beam can be observed in the anterior segment cross-sectional image, and a reference position setting means for setting a reference position with respect to the eye to be inspected; A moving means for moving the apparatus; a deviation detecting means for detecting a deviation from the reference position by the moving means; and a notifying means for notifying an examiner of information detected by the deviation detecting means. Ophthalmic measuring apparatus according to claim.

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