KR20190108904A - method and apparatus for automatic measurement of deviation angle in strabismus - Google Patents

Abstract

The present invention relates to an automatic strabismal angle measurement method and an automatic strabismal angle measurement device using the same, which can accurately and automatically measure a strabismal angle of an examinee by analyzing a change in position of a cornea while moving positions of a left image viewed by a left eye and a right image viewed by a right eye to correspond to a biased visual axis. The automatic strabismal angle measurement device of the present invention comprises: a body; an image output unit installed inside the body to separate and output a left image viewed by a left eye and a right image viewed by a right eye; a photographing unit installed inside the body to photograph the left and right eyes facing the image output unit; and a control unit for controlling positions of the left and right images, and calculating a biasing degree of a strabismal eye from a photographing image obtained through the photographing unit.

Description

Automatic method for measuring angle of deviation and using the same method for measuring automatic angle of deviation {method and apparatus for automatic measurement of deviation angle in strabismus}

The present invention relates to an automatic measurement method of a perspective angle and an automatic measurement device using the same, and more particularly, the position of the cornea while moving the position of the left image viewed by the left eye and the right image viewed by the right eye according to the biased time axis. The present invention relates to a method for automatically measuring a perspective angle capable of precisely and automatically measuring a subject's perspective angle by analyzing a change, and to an apparatus for automatically measuring a perspective angle using the same.

Strabismus is a vision disorder in which the two eyes look at different points without being aligned. In strabismus, when one eye faces the front, the other eye turns inward or outward, or turns up or down and is biased. It is the deviation angle that expresses the degree of this deviation as an objective figure.

Methods for measuring ocular deviation in the ophthalmology field are needed in various therapeutic areas, and more accurate ocular deviation measurement is required for more accurate treatment. Particularly in the case of strabismus patients, accurate measurement of strabismus should be accompanied to correct or correct strabismus symptoms by accurate treatment.

Although various methods are used as a measurement method of the perspective angle, the prism cover test (PCT) is the most widely used clinically.

The prism cover test is a method of measuring a perspective angle using a prism. The prism cover test alternates a plurality of prisms having different refractive indices and is placed one by one in front of the subject's eyes to find the subject's perspective angle.

However, this test method has the disadvantage that the deviation of the measurement value may appear largely according to the experience and proficiency of the examiner because the tester measures and calculates the degree of strabismus by manual labor.

In order to solve this problem, Korean Patent Registration No. 10-1761635 discloses a perspective angle measuring method and apparatus.

The patent measures the perspective angle by comparing the camera images before and after the blocking of one eye's field of view and measures the eye movement distance, and thus has the advantage of allowing more objective and accurate judging than the conventional prism cover test. However, the patent has a problem that both the blocking of the field and the image taking is made in a manual manner.

Korean Patent Registration No. 10-1812249 discloses an automatic measurement mechanism isometric.

The strabismus automatic measuring device includes a frame including an alternative hole formed on one side and an observation hole formed on the other side and an inner space formed therein, and provided in the inner space of the frame and disposed to correspond to the front of both eyes. It is connected to the identification camera and the recognition camera which is provided on the upper side of the spectral glass, respectively to shoot both eyes through the spectral glass, the shielding control device provided in the observation hall to selectively shield the observation hall, It includes a displacement analysis unit for measuring the strabismus by analyzing the displacement of both eyes generated by the shielding control device.

The automatic strabismus measuring instrument has an advantage of being easy to use in that it can be measured on the face automatically so that it can be worn on the face.

However, there is a problem that a camera for photographing both eyes and an image output device for illuminating an image in both eyes are fixed at a specific position. Since the distance between the two eyes varies from person to person, the camera and the image need to be positioned at the center of each eye for accurate perspective measurement.

In addition, the patent measures the perspective angle through the displacement of the eye due to the shielding of the left and right eyes, but there is no final process of verifying the measured angle of deviation so that the kappa angle of both eyes is different or ARC (abnormal retinal response) It is difficult to cope with unusual strabismus abnormalities.

1. Republic of Korea Patent No. 10-1761635: Method and device for measuring the measurement angle 2. Republic of Korea Patent Registration No. 10-1812249: Isometric automatic measuring mechanism

The present invention was created to improve the above problems, by separating the left image seen by the left eye and the right image seen by the right eye from each other and outputting them as two images, which is configured to move the position of each image. The purpose of the present invention is to provide a method for automatically measuring the perspective angle, and to analyze the positional change of the corneal cornea while moving the image to the visual axis, and to provide an automatic measurement device using the same.

A perspective angle automatic measuring device of the present invention for achieving the above object and the main body; An image output unit installed in the main body and separately outputting a left image visible to the left eye and a right image viewed to the right eye; A photographing unit installed in the main body to photograph the left and right eyes facing the image output unit; And a control unit which adjusts positions of the left image and the right image, and calculates a deviation degree of the cyan from the photographed image obtained through the photographing unit.

The light source unit is installed on the main body and emits light to the left and right eyes.

The main body includes a cover housing and a blocking member installed inside the cover housing to separate the inside of the cover housing into a left space corresponding to the left eye and a right space corresponding to the right eye.

The image output unit outputs the left image to the left space and the right image to the right space.

The image output unit is provided as one display for separating and outputting the left image and the right image left and right.

The image output unit includes a left eye display for outputting the left image and a right eye display for outputting the right image.

The display is formed into a curved surface.

The photographing unit includes a left eye camera installed in the left space and photographing the left eye, and a right eye camera installed in the right space and photographing the right eye.

And a camera moving means for independently moving the left eye camera and the right eye camera, respectively.

A first external camera installed in the main body to obtain a first external video image by capturing the front of the main body, and a second external camera installed in the main body to obtain a second external video image by capturing the front of the cover housing; The camera further includes a first external video image as the left image and the second external video image as the right image through the image output unit.

And automatic angle measurement method of the present invention for achieving the above object is the image interval adjusting step of adjusting the distance between the left image visible to the left eye and the right image visible to the right eye according to the binocular distance of the subject; A discriminating step of discriminating a principal eye and a blind eye by comparing the change of the cornea position of the left eye and the right eye from the primary photographed image of the left eye and the right eye of the subject; And calculating a perspective angle by obtaining a deviation degree of the cyanide determined in the discriminating step.

And a verifying step of verifying whether the perspective angle is correct after the calculating step.

The verification step includes a) moving any one of the image positions corresponding to the cyan in the left and right images by a movement value calculated from the perspective angle; and b) a second image of the left and right eyes of the examinee. And comparing the image shifted through the positional change of the cornea from the photographed image with the visual axis of the cyanide.

And a revalidation step of correcting and revalidating the perspective angle when the position of the cornea corresponding to the astigmatism is changed in the verification step.

The re-validation step may include a) obtaining a correction amount of the strabismus angle by analyzing a change in the position of the cornea corresponding to the cyanoid from the secondary photographed image, and b) the left and right images by the shift value calculated from the correction amount. Moving an image position corresponding to the cyan, and c) comparing a change in the position of the cornea corresponding to the cyan from a third photographed image of the left and right eyes of the examinee.

When there is no change in the position of the cornea corresponding to the strabismus in the third photographed image, the corrected perspective angle is calculated by adding the correction amount to the perspective angle.

The determining may include a) photographing a left eye looking at the left image while simultaneously outputting the left and right images, and obtaining a first left eye image, photographing a right eye facing the right image to obtain a first right eye image. And b) photographing the left eye facing the left image when the left image is output while the left and right images are alternately output to obtain a second left eye image, and the right image when the right image is output. Acquiring a second right eye image by photographing the right eye, and c) comparing a change in the corneal position of the first left eye image and the second left eye image, and comparing the first right eye image with the second right eye image. Comparing the change of corneal position.

The discriminating step outputs a first external image image obtained by photographing the front of the subject as the left image, and outputs a second external image image obtained by photographing the front of the subject as the right image.

The calculating step calculates the perspective angle by comparing the kappa angle obtained from the main cyan or the cyan to the deviation angle obtained from the cyan.

The calculating step includes the steps of: a) photographing the subject cyan and the cyan in a state in which the light is illuminated on the subject cyan and the cyan to obtain a cyan corneal reflecting image and a cyan corneal reflecting image; b) obtaining the cyan corneal reflecting image. Calculating the kappa angle of the main cyan by measuring the distance between the center of the cornea and the reflection point generated in the cornea of the main cyan, c) through the corneal reflection image of the cyan, Calculating a deviation angle of the cyanide by measuring a distance; and d) calculating a deviation angle of the cyanide by comparing the kappa angle of the main cyan and the deviation angle of the cyanide.

The determining may include a) photographing a left eye looking at the left image while simultaneously outputting the left and right images, and obtaining a first left eye image, photographing a right eye facing the right image to obtain a first right eye image. And b) photographing the right eye at the time of outputting the left image in the state of alternately outputting the left and right images, obtaining a second right eye image, and photographing the left eye at the time of outputting the right image. And acquiring a change in the corneal position of the first left eye image and the second left eye image, and comparing the change of the corneal position of the first right eye image and the second right eye image.

As described above, according to the present invention, by using two images and a camera which can move up and down or left and right, the image can be displayed and photographed at the center position of each eye according to the distance between both eyes of the subject, so that a more accurate measurement of the perspective angle can be obtained. It is possible.

In addition, the present invention is based on the primary angle of the first calculated angle to see whether the corrected angle of the first angle through the verification process to analyze the change in the position of the cornea while moving the image viewed by the visual axis of the subject is correct. You can check it.

This enables not only accurate measurement of the strabismus angle, but also effective coping with rare strabismus abnormalities such as different kappa angles in both eyes and ARC.

1 is a perspective view of a perspective angle automatic measuring device according to an embodiment of the present invention,
FIG. 2 is a front view schematically showing the inside of FIG. 1;
3 is a side view schematically showing the inside of FIG. 1,
4 is a plan view schematically illustrating the inside of FIG. 1;
Figure 5 is a perspective view of the main portion applied to Figure 1,
6 is a block diagram of FIG. 1,
7 is a plan view schematically showing the interior of the automatic perspective measurement apparatus according to another embodiment of the present invention,
8 is a plan view schematically showing the interior of the automatic perspective measurement apparatus according to another embodiment of the present invention,
9 is a front view schematically showing the interior of the automatic perspective measurement apparatus according to another embodiment of the present invention,
10 is a side view schematically showing the inside of FIG. 9,
FIG. 11 is a plan view schematically illustrating the interior of FIG. 9;
12 is a schematic diagram conceptually showing a state when both eyes of a normal person gaze at an object,
FIG. 13 is a schematic diagram for calculating the kappa angle of the right eye in FIG. 12;
14 is a schematic diagram conceptually showing how both eyes of an strabismus patient observe an object,
15 is a diagram showing the corneal reflection of a normal person,
16 is a diagram showing the corneal reflection of the right eye esotropia,
17 is a diagram showing the corneal reflection of the right eye of the patient with exotropia,
18 is a bilateral corneal reflection image of a patient having an esotropia of the right eye,
19 is a bilateral corneal reflex image of a patient whose right eye is exotropia,
20 is a bilateral corneal reflection image of a patient with esotropia of the left eye,
FIG. 21 is a bilateral corneal reflection image of a patient with an exotropia in the left eye,
22 is a diagram showing the change in the position of the corneal reflecting point according to the degree of deviation of the cyanide,
Fig. 23 is a schematic diagram showing the deviation distance and deviation angle of the main eye;
It is a schematic diagram which shows the deviation distance and deviation angle of a cyanide.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the automatic perspective measurement method according to a preferred embodiment of the present invention and a perspective angle measurement apparatus using the same.

1 to 6, a perspective angle automatic measuring device according to an embodiment of the present invention includes a main body 6 and a left image 11 and a right eye which are installed inside the main body 6 and can be seen by the left eye. An image output unit 10 for separating and outputting the right side viewable image 13 from each other, a photographing unit installed inside the main body 6 and photographing the left and right eyes facing the image output unit 10; The control unit 100 adjusts the positions of the left image 11 and the right image 13 and calculates the degree of deviation of the cyan from the photographed image obtained through the photographing unit.

The main body 6 is located in front of the face of the examinee. Therefore, the examinee can look inside the main body 6 through the left eye and the right eye.

The body 6 may have a structure that can be worn on the face in a wearable manner.

On the contrary, the main body may be formed larger than the wearable method and installed on the floor or table of the room or on the support frame. In addition, the main body may be installed indoors or outdoors in a rectangular form such as a vending machine. In the case of such a body, the subject may measure the perspective angle while looking into the interior of the body while sitting or standing in front of the body.

 The main body 6 has a structure in which the blocking member 5 is installed inside the cover housing 1 forming the exterior so that the inner space of the cover housing 1 is divided into a left space part and a right space part.

Hereinafter will be described taking the main body of the wearable type wearable on the face as an example.

The main body 6 shown is installed in the cover housing 1 and the cover housing 1, and a blocking member for separating the inside of the cover housing 1 into the left space part 3 and the right space part 4. (5) is provided.

Cover housing (1) is formed in a structure that can be located on the front of the face to cover both eyes. The cover housing 1 is formed with an empty space therein, the front is blocked. The cover housing 1 may be worn on the face in a wearable manner.

To this end, fixing means for fixing the cover housing 1 to the face may be further provided in the main body. As an example of the fixing means there is shown a fixing belt 9 installed in the cover housing 1. Fixing belt (9) is coupled to detachable to the patient's head. Instead of the fixing belt (9) by applying a variety of fixing means, such as helmet, band can be fixed to the cover housing (1) of course.

The rear surface of the cover housing 1 in contact with the face is preferably formed to be bent in a curved shape in order to increase the adhesion to the face. In addition, the rear edge of the cover housing 1 may be provided with a cushioning portion 2 formed of a flexible material in contact with the face.

The blocking member 5 is installed inside the cover housing 1. The blocking member 5 is formed in a plate shape. The blocking member 5 serves to separate the inside of the cover housing 1 into two spaces, that is, the left space portion 3 and the right space portion 4. The left space 3 is a space corresponding to the left eye of the subject, and the right space 4 is a space corresponding to the right eye of the subject.

Although not shown, the cover housing 1 may be provided with an illumination lamp for internal lighting. Lighting lamps can be applied to the LED to adjust the illumination step by step. One lighting lamp may be installed in each of the left space part 3 and the right space part 4. By the lighting lamp, the left space part 3 and the right space part 4 can be kept bright or dark.

Optical lenses 7 and 8 are respectively provided on the left and right sides of the rear surface of the cover housing 1. The optical lenses 7 and 8 are spaced a predetermined distance from side to side. The optical lens 7 located on the left side corresponds to the left eye of the subject, and the optical lens 8 located on the right side corresponds to the right eye of the subject. The left eye of the subject can see the left space 3 through the left optical lens 7, and the right eye can see the right space 4 through the right optical lens 8.

The optical lenses 7 and 8 allow the examinee to clearly see the left image 11 and the right image 13 output through the image output unit 10. As the optical lenses 7 and 8, a lens having an appropriate shape may be used according to the distance between the left image and the left eye and the distance between the right image and the right eye. For example, a convex lens may be applied to the optical lens. In addition, of course, the optical lens may be applied in the form of a single or a combination of two or more lenses.

The optical lenses 7 and 8 may be installed to be moved left and right by a user's operation. The left and right movement structures of the optical lenses 7 and 8 can be implemented using various known techniques.

The distance between the left and right eyes of a person, ie binocular distance, is not the same. In general, children have a narrow binocular distance, and adults have a wide binocular distance. In addition, even in the same age, the binocular distance varies according to the anatomy of the face. Therefore, as the optical lenses 7 and 8 can be moved left and right, the distance between the two optical lenses 7 and 8 can be adjusted according to the binocular distance of the examinee.

On the other hand, unlike the illustrated, the rear surface of the cover housing 1 is not provided with an optical lens, the through hole may be formed at the position. In this case, the left eye and the right eye can directly view the left image 11 and the right image 13 through the through-hole without passing through the optical lens.

The image output unit 10 is installed inside the cover housing 1. For example, the image output unit 10 may be installed inside the front of the cover housing (1).

The image output unit 10 outputs the left image 11 that the left eye can see and the right image 13 that the right eye can see. The left image 11 and the right image 13 are spatially separated. The left image 11 is located in the left space portion 3 and the right image 13 is located in the right space portion 4. By the blocking member 5, the left eye can only see the left image 11, and the right eye can only see the right image 13.

Preferably, the center of the left image 11 is located to correspond to the center of the left eye, and the center of the right image 13 is located to correspond to the center of the right eye. The center of the left and right eyes may mean the center of each eye. And the center of the eye may mean the anatomical center of the eye or the center of the cornea.

The image output unit 10 may output the image selected by the controller 100 among the images stored in the memory unit 120 as the left image 11 and the right image 13, respectively. The left image 11 and the right image 13 may be a still image such as a picture or a moving image such as a movie or a game.

The image output unit 10 may be implemented as one or two displays.

The illustrated example shows the use of one display. The screen of one display is divided into left and right and assigned to the left screen area and the right screen area, respectively, and the left image 11 is output in the left screen area and the right image 13 is output in the right screen area. The two screen areas are divided left and right, so that the left screen area is located in the left space part 3 and the right screen area is located in the right space part 4. When one display is used, the blocking member 5 is positioned between the left screen region on which the left image 11 is output and the right screen region on which the right image 13 is output.

When using one display, the control unit 100 may adjust the position and size of the left image 11 in the left screen region, and adjust the position and size of the right image 13 in the right screen region. Accordingly, the position of the left image 11 and the right image 13 may be moved in the left and right directions or freely moved in the vertical direction by the control of the controller 100. In addition, it is a matter of course that the effect of moving the left image and the right image can be obtained by moving the display itself in the left and right or up and down directions by a mechanical method.

As the position of the left image 11 and the right image 13 can be moved, it is possible to output different images of the subject, the left eye, and the right eye, respectively, and the position of the image can be adjusted to the binocular distance of the subject. Do. In addition, since only one of the left image and the right image can be moved independently, accurate perspective angle measurement is possible by analyzing the change of the position of the corneal cornea while moving the image of the cyanide side in accordance with the time axis in the astigmatism. In addition, since only one image of the left image and the right image can be selectively output, the cover test is possible even without covering the eyes.

In the illustrated example, the image output unit 10 shows a state of using a flat display, but as shown in FIG. 7, the image output unit 19 may use a curved display. A curved display curved in the left and right directions may reduce distortion of an image.

Although not shown, when the image output unit is implemented as two displays, the left eye display may be installed in the left space, and the right eye display may be installed in the right space. Thus, the two displays are separated from side to side. The blocking member is located between the two displays. The left image is output through the screen of the left eye display, and the right image is output through the screen of the right eye display. Since the position and size of the left image or the right image can be adjusted within each display screen, the position of the left image and the right image can be moved in the left or right direction or freely in the vertical direction by the control of the controller.

When the image output unit is implemented by two displays, each display may be formed in a curved surface. Preferably, as a curved display, an aspherical display similar to the shape of an eyeball may be used, which is bent in both left and right and up and down directions.

Inside the cover housing 1, a photographing unit for photographing the left and right eyes facing the image output unit 10 is installed.

The photographing unit may include one camera or two cameras. When the camera consists of one camera, the camera may be located at the center of the cover housing. When the camera is composed of two cameras, the camera is positioned one by one in the left space and the right space.

In the illustrated example, the photographing unit is provided with two cameras 20 and 25 so as to photograph the left and right eyes of the examinee, respectively. The left eye camera 20 is installed in the left space 3, and the right eye camera 25 is installed in the right space 4. The left eye camera 20 photographs the subject's left eye, and the right eye camera 25 photographs the subject's right eye.

A high resolution CCD camera can be used as the left eye camera 20 and the right eye camera 25. The video image of the left eye taken by the left eye camera 20 and the video image of the right eye taken by the right eye camera 25 are sent to the controller 100.

In the illustrated example, the left eye camera 20 and the right eye camera 25 are installed inside the front side of the cover housing 1 and are positioned below the image output unit 10. The left eye camera 20 is installed at a position corresponding to the center of the left image 11, and the right eye camera 25 is installed at a position corresponding to the center of the right image 13.

In the present invention, the left eye camera 20 and the right eye camera 25 may be independently moved by camera moving means. Accordingly, it is possible to adjust the position of the camera 20, 25 according to the binocular distance of the subject. In addition, since the camera 20, 25 can be moved freely in the left and right or up and down directions, precise perspective angle measurement is possible.

The illustrated camera moving means is provided with a first transfer unit 30 and a second transfer unit 39. The first transfer unit 30 moves the left eye camera 20, and the second transfer unit 39 moves the right eye camera 25. The first and second transfer units 30 and 39 employ a method capable of both left and right movement and up and down movement. Unlike this, only the left and right movements or only the vertical movements can be made.

For example, the first and second transfer parts 30 and 39 may be provided on a stage 29 provided inside the front surface of the cover housing 1, and installed on the stage 29. The left and right directions (X-axis direction) and the vertical direction ( It consists of an XY feed unit that can move in the Y-axis direction).

Since the first and second transfer parts 30 and 39 have the same structure except that only the installation positions thereof, the structure of the first transfer part 30 shown in FIG. 5 will be described as an example.

The rectangular stage 29 is installed below the image output unit. The stage 29 is provided with an X-Y transfer unit.

Various transfer devices are available as X-Y transfer unit. For example, a linear motor can be used. The linear motor has a structure in which a mover is coupled to a stator deployed in a straight line, and when the power is supplied, the mover performs a linear movement. Such a linear motor has an advantage of miniaturization and position control.

The illustrated XY transfer unit includes a pair of X-axis linear motors 31 and 32, a vertical guide bar 35 connecting the X-axis linear motors 31 and 32, and a pair of Y-axis linear motors 33. A horizontal guide bar 36 connecting the 34 and the Y-axis linear motors 33 and 34 and the vertical guide bar 35 and the horizontal guide bar 36 pass through the left eye camera 20. A moving block 37 is provided.

A pair of X-axis linear motors 31 and 32 are arranged side by side up and down. The stator 31a of each X-axis linear motor 31, 32 is fixed to the stage 29, and the mover 31b is coupled to the stator 31a. The mover 31b is moved left and right by the operation of the X-axis linear motors 31 and 32.

And a pair of Y-axis linear motors 33 and 34 are arranged side by side to the left and right. The stator 34a of each Y-axis linear motor 33, 34 is fixed to the stage 29, and the mover 34b is coupled to the stator 34a. The mover 34b is moved up and down by the operation of the Y-axis linear motors 33 and 34.

The vertical guide bar 35 is connected to the mover 31b of the pair of X-axis linear motors 31 and 32, and the horizontal guide bar 36 is the mover (of the pair of Y-axis linear motors 33 and 34). 34b).

The movable block 37 has a vertical sliding hole through which the vertical guide bar 35 passes up and down, and a horizontal sliding hole through which the horizontal guide bar 36 passes through is formed left and right. The left eye camera 20 is installed in the moving block 37. Of course, the right eye camera 25 is installed in the moving block 38 constituting the second transfer unit 39. The left eye light source unit 40 to be described later is installed in the moving block 37 of the first transfer unit 30, and the right eye light source unit 45 to be described later is installed in the moving block of the second transfer unit 39.

When the X-axis linear motors 31 and 32 operate under the control of the control unit 100, the moving block 37 moves in either direction, and when the Y-axis linear motors 33 and 34 operate, the moving block moves. Reference numeral 37 moves in one of the up and down directions. Thus, the present invention can freely move the left eye camera 20 and the right eye camera 25 to the required position by the X-Y transfer unit.

In addition, the left eye camera and the right eye camera may be installed in the moving block to adjust the viewing angle.

On the other hand, the present invention is preferably provided with a light source for emitting light to the left and right eyes. The light source unit may consist of one light source or two light sources. In the case of one light source, the light source unit is located at the center of the cover housing. When the light source is composed of two light sources, the light source is positioned one by one in the left space part and the right space part.

In the illustrated example, the light source unit is provided with two light sources to irradiate light to the left eye and the right eye of the examinee, respectively. That is, the left eye light source unit 40 for irradiating the light on the left eye is installed in the left space part 3, and the right eye light source unit 45 for irradiating the light on the right eye is installed in the right space part 4. The left eye light source unit 40 and the right eye light source unit 45 are for detecting the position of the reflection point of the light on the cornea by irradiating the light on the left eye and the right eye.

The left eye light source unit 40 and the right eye light source unit 45 are not particularly limited in terms of their installation position if they can irradiate light with their eyes, but are preferably installed at positions where the light can be irradiated from the front direction of the eye.

In the illustrated example, the left eye light source unit 40 is installed in the moving block 37 of the first transfer unit 30 to move together with the left eye camera 20, and the right eye light source unit to move together with the right eye camera 25. 45 is installed in the moving block 38 of the second transfer unit 39.

The left eye light source unit 40 and the right eye light source unit 45 may be formed of a light emitting diode provided on a substrate and a lens for focusing light of the light emitting diode. An infrared light emitting diode that generates infrared light may be used as the light emitting diode.

The controller 100 may be installed inside the cover housing 1. Unlike this, of course, the control unit 100 may be installed on the outside of the cover housing 1 by being electrically connected to the cover housing 1.

The controller 100 is composed of a micro process and various driving circuits to control the operation of the present invention. For example, the control unit 100 may turn on and off the image output unit 10 and adjust the position of the left image 11 and the right image 13, the operation of the left eye camera 20 and the right eye camera 25, and the first transfer unit ( 30) and the movement of the second transfer part 39, the on-off of the left eye light source part 40 and the right eye light source part 45, etc. are controlled.

In addition, the control unit 100 outputs the selected image to the left eye image 11 and the right eye image 13 through the image output unit 10, and various image images input from the left eye camera 20 and the right eye camera 25. Is analyzed and processed, and the perspective angle is measured by calculating and calculating the deviation degree of the cyan from the processed image image. In addition, the controller 100 may store the image image and various result values in the memory unit 120 and output them to an external device for display.

Meanwhile, the present invention may further include a power supply unit 110 for providing power, a memory unit 120 for storing data, an operation unit 130 for operation, and a communication unit 140 for communication with an external device. have.

The power supply unit 110 for supplying power to the present invention may use a battery installed in the cover housing (1). In addition, a commercial power source may be used as the power supply unit 110. In this case, the power supply unit 110 may be connected to the cover housing 1 using a power cable.

The memory unit 120 may be configured as various reservoirs for storing various image data and numerical data. It may be a volatile memory, a nonvolatile memory, and a hard disk that may be installed in the cover housing 1 as the memory unit 120 for storage. In addition, the memory unit 120 may use a floppy disk, a compact disk, a USB (USB), and the like, which exist outside the cover housing.

The operation unit 130 may be provided outside the cover housing 1. The operation unit 130 may be provided as a key for setting a supported function including a power button or may be provided as a touch panel.

The communication unit 140 is controlled by the control unit 100 to perform communication. The communication unit 140 may communicate in a wired or wireless manner. The wireless communication unit 140 may be configured to perform wireless communication by a Bluetooth communication module supporting short range wireless communication.

In addition, the present invention may be further provided with an external output unit for outputting the result value to the outside. The external output unit may be provided outside the cover housing. The external output unit is connected to the control unit by wireless or wired and outputs a result. As the external output unit, a computer, a TV, a small LCD display, a printer, a mobile terminal, or the like may be used.

In addition, the present invention may be provided with a speaker for voice guidance to the subject. The controller may request a subject to posture or gaze direction suitable for a perspective measurement process through a speaker.

On the other hand, a perspective angle automatic measuring device according to another embodiment of the present invention is shown in FIG.

The perspective angle automatic measuring device shown in FIG. 8 further includes a first external camera 50 and a second external camera 55. The remaining components are the same as in the above-described embodiment.

Referring to FIG. 8, a first external camera 50 and a second external camera 55 are installed on the front surface of the cover housing 1. The first external camera 50 and the second external camera 55 are spaced from side to side and installed side by side.

The first external camera 50 is installed at a position corresponding to the left space 3, and the second external camera 55 is installed at a position corresponding to the right space 4. The first external camera 50 photographs the front of the cover housing 1 to obtain a first external video image, and the second external camera 55 photographs the front of the cover housing 1 to the second external video image. Acquire.

The first external camera 50 and the second external camera 55 may be configured to adjust a convergence angle according to the viewing distance. For example, when looking at a near place, the viewing angle between the gazing direction of the first external camera 50 and the gazing direction of the second external camera 55 is increased, and when viewing a distance, the gazing direction of the first external camera 50 is increased. And the viewing angle formed by the viewing direction of the second external camera 55 is reduced.

The first external video image photographed by the first external camera 50 is output as the left image by the controller, and the second external video image photographed by the second external camera 55 is output as the right image by the controller. The controller may output the first external image image and the second external image image in real time or store the memory unit in a memory unit and later output the same.

Since the subject looks at the first external image image through the left eye and the subject looks at the second external image image through the right eye, the examiner sees the front object as a three-dimensional image even when the cover housing 1 is worn on the face. Can be.

On the other hand, a perspective angle automatic measuring device according to another embodiment of the present invention is shown in Figs.

The illustrated automatic angle measuring apparatus shows that the position of the camera and the image output unit can be freely adjusted using beam splitters 60 and 65 which are a kind of spectrometer.

9 to 11, the left eye camera 20 and the right eye camera 25 are installed inside the front side of the cover housing 1, and the image output unit 10 is placed inside the bottom surface of the cover housing 1. It is different from the embodiment of FIG. 2 in that it is installed.

The left beam splitter 60 is inclined in the left space 3, and the right beam splitter 65 is inclined in the right space 4.

The left image output through the image output unit 10 is reflected by the left beam splitter 60 and sent to the left eye of the subject, and the right image is reflected by the right beam splitter 65 and sent to the right eye of the subject. The left eye camera 20 and the right eye camera 25 are installed in front of both eyes of the examinee to photograph the left and right eyes of the examinee, respectively. Therefore, the present invention shown in the left eye camera 20 and the right eye camera 25 can shoot the left eye and the right eye, respectively, in front of the eyes of the examinee, it is possible to more accurately measure the perspective angle.

And unlike the illustrated, using the beam splitter, the image output unit may be installed inside the upper surface of the cover housing, or the left eye camera and the right eye camera may be installed inside the bottom surface or the upper surface of the cover housing.

The present invention of the wearable type described above may be implemented as a virtual reality (VR) device or an augmented reality (AR) device. Therefore, as long as the VR device or the AR device includes the technical configuration of the present invention, it is included in the embodiment of the present invention.

Hereinafter, a description will be given of a method for automatically measuring a perspective angle using the above-mentioned automatic measuring apparatus.

Strabismus is a vision disorder in which the two eyes look at different points without being aligned. In strabismus, when one eye faces the front, the other eye turns inward or outward, or turns up or down and is biased. It is the deviation angle that expresses the degree of this deviation as an objective figure.

Fig. 12 conceptually shows a state in which both eyes of a normal person without strabismus observe the object.

Referring to FIG. 12, when the anatomical center of the eye is referred to as an optical axis, and the path of a gaze for looking at an object is called a visual axis, the optical axis and the visual axis do not necessarily coincide.

The optical axis can be represented by a line that passes through the center of the cornea (or the center of the pupil) A and is perpendicular to the surface of the cornea. The visual axis is the line connecting the object (viewing point) and the fovea centralis of the retina. Intersect with the optical axis. Since the position of the central part of the macula is away from the center of the retina, the optical axis and the visual axis do not coincide. The angle between the optical axis and the time axis is called an angel kappa. Therefore, if the optical and time axes coincide, the kappa angle is zero.

Most people have a kappa angle because their optical and time axes do not coincide. When the intersection (B) of the visual axis and the cornea is separated from the center (A) of the cornea to the inner side (nose direction), it is a positive kappa angle, and if it is separated from the center (A) of the cornea to the outside (ear direction), it can be classified as a negative kappa angle. have. The illustrated example is a positive kappa angle because the intersection B of the visual axis and the cornea is separated from the center A of the cornea to the inner side (nose direction).

A large positive kappa angle looks like an exotropy and a large negative kappa angle looks like an esotropia. Normally, the normal number of benign kappa angles and the kappa angle less than 5 degrees in ophthalmology are considered normal.

Since kappa angle is difficult to measure directly, it can be converted by measuring the linear distance between A (center of cornea) and B (intersection of cornea and cornea).

The schematic diagram for calculating the kappa angle of the right eye shown in FIG. 12 is shown in FIG.

Referring to FIG. 13, when a straight line Ln connecting A and B is drawn, if the curvature of the cornea is ignored, the straight line Ln may be assumed to be perpendicular to the optical axis. If the distance (L ₀ ) between C (node) and A (center of the cornea) is known, θ _k can be obtained because tanθ _k = Ln / L ₀ . Where θ _k means kappa angle. The kappa angle is an angle indicating how far the visual axis is from the optical axis. If the kappa angle is θ _k , the linear distance between A and B is the deviation distance. The distance from the center of the cornea to the node L ₀ varies slightly from person to person, but on average it is 7.14mm.

When the deviation distance is 1mm, the kappa angle is about 8 °, which is about 14Δ when converted into a prism diopter (Δ). And when the deviation distance is 3mm, the kappa angle is about 22.8 °, which is about 42Δ when converted into a prism diopter. The relationship between the prism diopter and the kappa angle is Δ = 100 × tanθ _k .

If both eyes are normal, the visual axis of the left and right eyes is directed toward the object as shown in FIG. In contrast, strabismus does not have convergence or deteriorates, so the gaze does not converge in one place.

Referring to FIG. 14, the left eye is normal and the right eye is exotropy.

Normally, in strabismic patients, when one looks at an object with both eyes, one eye normally looks at the object, but the other eye does not. Normally, an eye that looks at an object is called a main cyan, and when an eye that does not look at an object is different from that of a cyan, a cyan, a right eye is a cyan and a left eye is a cyan in FIG. The visual axis in the left eye faces the object, but the visual axis in the right eye is outward of the object.

When the visual axis is assumed to be normal and the visual axis is defined as the virtual axis, the perspective angle means the degree of deviation of the visual axis from the virtual axis. Θ _s is therefore the perspective angle.

To calculate the strabismus angle, measure the kappa angle for the visual acuity and the deviation angle for the acuity. The kappa angle of the occlusion and the deviation angle of the cyan may be obtained using the corneal reflection method described later.

The angle of deviation can be obtained by comparing the kappa angle of the occidental angle with the deviation angle of the cyanide.

Since the dominant eye is the left eye, the kappa angle, which is the angle of the dominant eye axis to the optical axis, is θ _k . In addition, the deviation angle of the cyanide may be defined as an angle θ _d formed between the virtual visual axis and the optical axis.

And the deviation angle (θ _s) can be determined as the difference between each kappa (θ _k) and deviation (θ _d) of sasian in the eye. Angle θ _m the visual axis and the optical axis of the sasian forms will be visible to be the same and each kappa θ _k in eye angle of deviation θ _s = θ _d θ _k to be.

In the case of esotropia, although not shown, the angle of deviation can be obtained by adding the kappa angle of the occidental angle and the deviation angle of the cyanide. For example, the angle of deviation θ _{s for} esotropia. = θ _d + θ _k to be.

Also, unlike the above, the angle of deviation can be obtained by comparing the kappa angle of cyanide and the deviation angle of cyanide. The kappa angle of cyanide can also be obtained using corneal reflection, which will be described later. In general, the kappa angle of the cyan may be considered to be the same as the kappa angle of the cyan, but in rare cases the kappa angle of the cyan and the cyan may be different.

When looking at an object with both eyes, the cyanide does not look at the object, but when looking at the object with only the cyan with the occlusion obscured, it looks at the object. Therefore, the kappa angle can be calculated by looking at the object only with the cyan, and by calculating the angle between the visual axis and the optical axis of the cyan.

An automatic perspective measurement method according to an example of the present invention will be described with reference to FIGS. 2 to 6.

The automatic perspective measurement method of the present invention is composed of an image interval adjusting step, a discrimination step, and a calculation step. Hereinafter, each step will be described in detail.

1. Image interval adjustment

The distance between the left image 11 and the right image 13 is adjusted according to the binocular distance of the subject for precise measurement of the perspective angle.

The binocular distance refers to the distance between the center of the cornea of the left eye and the center of the cornea of the right eye. This is the same concept as pupil-distance (PD).

The binocular distance of the subject can be measured by a specialist or a optician using a separate measuring tool. In this case, when the measured binocular distance of the examinee is input through the manipulation unit 130, the controller 100 controls the image output unit 10 to determine the distance between the center of the left image 11 and the center of the right image 13. Adjust the distance between both eyes. In addition, the control unit 100 may drive the first transfer unit 30 and the second transfer unit 39 to adjust the distance between the left eye camera 20 and the right eye camera 25 by a binocular distance.

Unlike the above, the binocular distance of the subject may be measured using the left eye camera 20 and the right eye camera 25. For example, the left eye is photographed with the left eye camera 20 while the cover housing 1 is worn on the face, the right eye is photographed with the right eye camera 25, and then the position of the corneal center and the right eye The binocular distance can be calculated by reading the location of the center of the cornea in the photographed image.

2. Determination Step

Next, the left eye and the right eye are photographed while the cover housing 1 is worn on the face to obtain a primary photographed image. Perform the steps. The discriminating step may determine which of the two eyes is the main cyan and which is the cyan.

In detail, the determining may include a) obtaining a first left eye image by photographing a left eye looking at a left image while simultaneously outputting a left and right image, and obtaining a first right eye image by photographing a right eye looking at a right image And b) photographing the left eye looking at the left image when the left image is output while the left and right images are alternately output to obtain a second left eye image, and photographing the right eye looking at the right image when the right image is output. Acquiring a second right eye image, and c) comparing a change in corneal position between the first left eye image and the second left eye image, and comparing the change in the corneal position between the first right eye image and the second right eye image. .

(a) Article 1 Left Eye Image  And Right Eye Image  acheive

In order to obtain the first left eye image and the first right eye image, the left image 11 and the right image 13 are simultaneously output through the image output unit 10 under the control of the controller 100. The left image 11 and the right image 13 may be a still image or a moving image.

Preferably, the left image and the right image may be images captured by a 3D camera. When two 2D images taken from different angles are output as left and right images, the examinee can see a stereoscopic image.

In addition, as shown in FIG. 8, when the first external camera 50 and the second external camera 55 are provided, the first external video image photographed by the first external camera 50 is transferred to the controller 100. By the left image 11 is output in real time, the second external image taken by the second external camera 55 may be output in real time to the right image 13 by the controller 100.

When the left image 11 and the right image 13 are output simultaneously, the subject's left eye looks at the left image 11, and the right eye looks at the right image 13. At this time, the left eye looking at the left image 11 is photographed with the left eye camera 20 to obtain a first left eye image, and the right eye looking at the right image is photographed with the right eye camera 25 to obtain a second right eye image.

The obtained first left eye image and second right eye image are stored in the memory unit 120.

(b) Article 2 Left Eye Image  And Article 2Eye Images  acheive

Next, a second left eye image and a second right eye image are obtained.

The left and right eyes are photographed while alternately outputting the left image 11 and the right image 13 to acquire the second left eye image and the second right eye image.

For example, when the left image 11 is output, the left eye is photographed by the left eye camera 20 to obtain a second left eye image. At this time, the right image is not output.

The output of the left image 11 is stopped and the right image 13 is output. In this state, the right eye looking at the right image 13 is photographed with the right eye camera 25 to obtain a second right eye image. The obtained second left eye image and second right eye image are stored in the memory unit 120.

When the second left eye image and the second right eye image are acquired, the second left eye image and the second right eye image may be obtained after alternately illuminating the images in both eyes for a predetermined time to measure the largest deviation angle.

When one eye is covered, changes in the position of the cornea of the other eye can be used to identify strabismus. This is a common cover test performed at an ophthalmology clinic.

The conventional cover test is performed while alternately covering one eye and looking at the gaze point with the other eye. On the contrary, the present invention has an effect of covering one eye by a method of alternately outputting a left image and a right image, thereby avoiding the hassle of covering one eye as in the related art. In addition, since the separate configuration covering one eye can be omitted when implemented in an automated device as in the present invention, the structure can be simplified.

(c) Comparison of corneal position changes

The controller 100 retrieves the first left and right eye images and the second left and right eye images, which are the first photographed images stored in the memory 120, to determine whether there is a strabismus disorder, and to determine a visual acuity and a strabismus.

In normal people without strabismus, both eyes always look at the object, whether looking at the object with both eyes or only with one eye. Therefore, there is no change in the position of the cornea.

However, in people with strabismus, when they look at the object with both eyes, the eye sees the object, but the eye sees the object. When looking at an object only through the cyan, the cyan observes the object. Thus, in the case of astigmatism, a change in the position of the cornea occurs.

The position of the cornea moves in the ear direction in esotropia and in the nose direction in esotropia. And moves up or down in case of upper or lower strabismus.

The control unit 100 compares the first left eye image with the second left eye image through software, analyzes the change in the position of the cornea of the left eye, compares the first right eye image with the second right eye image, and analyzes the change of the corneal position of the right eye. Determine if there is a failure.

For example, if the corneal position does not occur in both the left and right eyes, it is determined to be normal, and if the corneal position changes in either the left or right eye, it is determined as a strabismus disorder.

In the case of strabismus, the main and the astigmatism are distinguished based on which eye the corneal position changes occurred. If the corneal position changes in the left eye, the left eye is the left eye and the right eye is the main eye. In the case of corneal position changes in the right eye, the right eye is the left eye and the left eye is the main eye.

In addition, according to which direction the position change of the astigmatism occurs, it can be distinguished by being divided into exotropia, exotropia, superior oblique and hypotropia.

On the other hand, the strabismus can be divided into prehistoric strabismus and latent strabismus. Overt strabismus has a lack of convergence, and one eye is biased when looking at the object with both eyes. In addition, latent emissive eyes have a convergence function when looking at an object with both eyes, so the strabismus is not usually revealed, but the blind eye is biased when covering one eye.

In the case of manifested strabismus, as described above, it can be discriminated through the change of the corneal position of the eye of the image output side. However, in case of latent copying, it cannot be discriminated by the above-described discrimination method.

While the left and right images 11 and 13 are simultaneously output, the left eye facing the left image 11 is photographed to obtain a first left eye image, and the right eye facing the right image 13 is photographed to capture the first right eye. Acquire an image. In addition, the left and right images 11 and 13 are alternately output to obtain a second right eye image when the left image 11 is output, and the left eye is taken when the right image 13 is output. Acquire 2 left eye images. The change of the corneal position of the first left eye image and the second left eye image is compared, and the change of the corneal position of the first right eye image and the second right eye image. As a result of the comparison, when the corneal position changes in either the left eye or the right eye, it can be identified as latent radiation.

As described above, the present invention has an effect of alternately covering both eyes in a manner of alternately outputting the left image and the right image, so that both the image and the image can be taken when the image is not output. Therefore, discrimination at the time of latent radiation is very easy. On the other hand, the conventional cover test has a problem that it is difficult to determine the latent radiation because it can not grasp the change in the position of the cornea of the blind eye because it covers the eye with a shielding plate.

3. Visual angle calculation stage

If it is determined as strabismus disorder, a calculation step of calculating the deviation angle from the degree of deviation of the strabismus is performed.

The calculating step may calculate the perspective angle by comparing the kappa angle obtained from the main cyan or the cyan to the deviation angle obtained from the cyan. The kappa angle of the occlusion, the kappa angle of the cyan, and the deviation angle of the cyan can be obtained by corneal reflection.

The corneal reflection method is a method of measuring how much a certain point (hereinafter, referred to as corneal reflection point) of the cornea that the light is reflected from the front of the face is displaced from the center of the cornea.

Examples of corneal reflections in both eyes are shown in FIGS. 15 to 17. 15 is an image of a normal person, FIG. 16 is a binocular image of a patient with esotropia, and FIG. 17 is a binocular image of a patient with exotropia. In FIGS. 15 to 17, portions of the cornea marked with white circles are corneal reflection points.

Referring to FIG. 15, in a normal person, corneal reflection points are formed near the corneal center in both the left eye and the both eyes. In normal cases, corneal reflex points are formed slightly away from the cornea's center. In ophthalmology, a kappa angle of less than 5 degrees is considered normal, so it is normal if the corneal reflex point is within 0.62mm from the center of the cornea. Corneal reflexes are present on the visual axis in normal subjects. Therefore, the intersection between the time axis and the surface of the cornea is the corneal reflection point. Corneal reflection point means B in FIG.

Fig. 16 shows a case in which the left eye is occlusion and the right eye is esotropia. In the left eye, the corneal reflex is formed near the center of the cornea, while in the right eye, the corneal reflex is biased toward the ear from the center of the cornea.

And 17 shows the case where the left eye is the main eye and the right eye is the exotropia. In the left eye, the corneal reflex is formed near the center of the cornea, while in the right eye, the corneal reflex is biased toward the nose from the corneal center.

As such, the degree of deviation of the cyanogen can be measured by illuminating the light from the front of the face and taking a picture of both eyes (corneal reflection image).

For example, the calculating step may include a) acquiring the occlusion corneal reflection image and the acetabular corneal reflection image by photographing the occlusion eye lens and the cyanogen eye in a state where the light is illuminated in the occlusion eye lens and the cyanide eye eye; Calculating the kappa angle of the main cyan by measuring the distance between the reflection point and the center of the cornea, and c) the deviation angle of the cyan by measuring the distance between the reflection point and the center of the cornea through the corneal reflection image. Comprising the step of calculating the d, and the angle of deviation of the kappa angle of the cyan and the deviation angle of the cyan, and calculating the angle of deviation of the cyan.

(a) Corneal Reflection Image  acheive

Light up Josiah and Sasiah. To this end, the control unit 100 simultaneously operates the left eye light source unit 40 and the right eye light source unit 45 to generate light from the left eye light source unit 40 and the right eye light source unit 45. At this time, the subject looks at the light. Light is reflected from both eyes of the subject, forming corneal reflection. In this state, the left eye is photographed with the left eye camera 20 to obtain a corneal reflection image of the left eye, and the right eye is photographed with the right eye camera 25 to obtain a corneal reflection image of the right eye. Among the left eye and right eye corneal reflex images, the image corresponding to the gaze is the occidental corneal reflex image, and the image corresponding to the cyanogenous eye is the cyanotic corneal reflex image.

Examples of various corneal reflection images are shown in FIGS. 18-21.

18 and 19 are views of corneal reflection images obtained by photographing both eyes of a subject having a left eye and a right eye and a right eye.

Referring to FIG. 18, the right eye of the right eye is formed inside the face compared to the left eye of the main eye, and accordingly, the center of the cornea of the right eye is located away from the corneal reflection point in the nose direction. Therefore, let the right eye die.

In addition, in FIG. 19, the right eye of the right eye is formed outward from the face, and the cornea center of the right eye is biased toward the ear from the corneal reflection point. The right eye is therefore an exotropia.

20 and 21 are views of corneal reflection images obtained by photographing both eyes of a subject having a right eye and a left eye and a left eye.

Referring to FIG. 20, the left eye of the left eye is formed inside the face compared to the right eye, and thus the center of the cornea of the left eye is located in the nose direction from the corneal reflection. So let's have a left eye.

In FIG. 21, the left eye of the left eye is formed toward the outside of the face compared to the right eye of the main eye, and accordingly, the center of the cornea of the left eye is biased toward the ear from the corneal reflection point. Therefore, the left eye is exotropia.

The greater the degree of deviation, the further the center of the cornea is from the corneal reflex. Referring to Fig. 22, the right eye is the main eye and the left eye is esotropia. In the case of (a), the corneal reflection in the left eye is formed near the pupillary, in (b) the corneal reflection is formed between the pupil and the corneal limbus, and in (c) the corneal reflection is formed near the corneal limbus. .

(b) Zucian Kappa angle  Calculation

Next, the kappa angle of the occlusion is calculated by measuring L _n , which is the distance between the corneal reflection point of the occlusion and the center of the cornea through the occlusion corneal reflection image.

If the left eye is the main eye and the right eye is the exotropia, L _n and the kappa angle of the main eye can be calculated as follows.

Referring to the state of the main eye shown in FIG. 23, the control unit 100 detects the positions of the corneal center A and the corneal reflecting point B, and then calculates the distance L _n between the corneal center A and the corneal reflecting point B. FIG. do.

Circular edge detection (CED), canny boundary detection, ellipse boundary detection, and the like may be applied to detect the corneal center A in the acquired corneal reflection image. In addition, accurate position detection is possible in software using techniques such as binarization and component labeling to detect the corneal reflection point B in the acquired corneal reflection image.

The controller 100 calculates the distance L _n between the corneal center A and the corneal reflecting point B through the detected corneal center A and the corneal reflecting point B. And the calculated L _n Based on the value, the controller 100 calculates the kappa angle θ _{k of} the main cyan. Since tanθ _k = Ln / L ₀ , the deviation angle (θ _k ) = tan ^-1 (Ln / L ₀ ) can be obtained.

(c) cyanide Excursion  Calculation

Next, the deviation angle of the deviation angle is calculated by measuring L _s , which is the distance between the deviation angle and the corneal center, using the angle reflection image of the deviation eye.

If the left eye is the dominant eye and the right eye is the exotropia, the Ls and deviation angles of the right eye can be calculated as follows.

Referring to the state of the cyanoid shown in FIG. 24, the control unit 100 calculates the distance Ls between the corneal center A and the corneal reflecting point B after detecting the positions of the corneal center A and the corneal reflecting point B. .

The controller 100 calculates a distance Ls between the center A of the cornea and the corneal reflection point B based on the detected corneal center and the corneal reflection point. The controller calculates the deviation angle θ _d of the cyan on the basis of the calculated Ls value. Since the deviation angle tanθ _d = Ls / L _0, it can be obtained as the deviation angle (θ _d ) = tan ^-1 (Ls / L ₀ ).

(d) Perspective  Calculation

Next, the deviation angle between the kappa angle of the main cyan and the deviation angle of the cyan is calculated.

Given that almost everyone is a positive kappa angle, the angle of deviation is the deviation angle of the cyanogenus minus the kappa angle of the occidental angle. That is, in the case of exotropia, the angle of deviation θ _s = θ _d -θ _k to be. In the case of esotropia, the deviation angle of the astigmatism is the sum of the kappa angle of the occlusion. In other words, the angle of deviation θ _{s for} esotropia = θ _d + θ _k to be.

As described above, the present invention can calculate the perspective angle θ _s using the photographed images of both eyes and the corneal reflection method.

On the other hand, the deviation angle can be calculated by obtaining the kappa angle of the cyan, and then comparing the deviation angle of the cyan.

For example, the first cyanotic corneal reflection image may be acquired by photographing the cyanogen in a state where only the cyan is lit. If a light shines only on it, it will keep an eye on it. The kappa angle of the cyanogen is calculated by measuring the distance between the center of the cornea and the reflection point generated in the corneal of the cyan using the first cyanographic corneal reflection image. Next, the second cyanotic corneal reflection image is obtained by photographing the cyanogen in a state in which light is lit on the main cyan and the cyan. If both the main cyan and the cyan see the light at the same time, the cyan is biased. The deviation angle of the cyanide is obtained by measuring the distance between the center of the cornea and the reflection point generated in the cyanide cornea through the second cyanide corneal reflection image. In this way, the kappa angle of the cyanide and the deviation angle of the cyanide can be obtained, and then the angle of deviation can be calculated by comparing the kappa angle and the deviation angle.

4. Verification step

Meanwhile, the present invention may further perform a verification step of verifying whether the calculated perspective angle is correct. This is to cope with unusual strabismus abnormalities such as different kappa angles of left and right eyes or ARC (Aberrant Retinal Response).

In the verification step, any one image corresponding to the cyanogen is positioned to coincide with the visual axis of the cyanogen, and then the perspective angle is verified by whether there is a change in the position of the corneal. If the calculated perspective angle is not correct, correct the perspective angle and re-verify. Revalidation may be repeated until the right angle is correct.

Specifically, the verifying step includes: a) moving any one of the left and right images corresponding to the cyan in the left and right images by a movement value calculated from the perspective angle; and b) a second photographed image of the left and right eyes of the examinee. And comparing the image shifted through the change of the position of the cornea corresponding to the acuity from the axial axis.

(a) Video position shift

The moving value of the image is calculated to confirm the perspective angle.

The image shifts the side corresponding to the cyanide. For example, if the right eye is left eye 11 is moved, if the right eye is right eye 13 is moved. The image may be moved in the horizontal direction or the vertical direction according to the deviation direction of the cyanide.

The shift value is calculated from the perspective angle. The controller 100 calculates a moving value from the perspective angle in consideration of the distance between the image and the eye, and then controls the image output unit 10 to move the position of any one of the left and right images 11 and 13. Move by.

The left eye camera 20 or the right eye camera 25 is also moved along with the movement of the image. When the left image 11 is moved, the left eye camera 20 is also moved the same distance in the same direction, and when the right image 13 is moved, the right eye camera is also moved the same distance in the same direction. The left eye camera 20 and the right eye camera 25 are moved through the first and second transfer units 30 and 39 controlled by the controller 100.

If the calculated perspective angle is correct, the position of the image after movement coincides with the visual axis of the cyanide. If the calculated perspective angle is not correct, the position of the image after moving does not coincide with the visual axis of the cyanogen.

(b) Comparison of Changes in the Location of Cerebral Corneal

After moving the image on the side corresponding to the astigmatism, the change of corneal position of the astigmatism is compared from the second photographed image of the subject's left and right eyes to confirm whether the angle of deviation is correct.

To this end, the left and right images 11 and 13 are simultaneously output, and the left eye looking at the left image 11 is photographed with the left eye camera 20 to obtain a third left eye image, and the right eye looking at the right image 13. To the right eye camera 25 to obtain a third right eye image.

Then, while outputting the left and right images 11 and 13 alternately, the left eye looking at the left image 11 when the left image 11 is output is taken with a left eye camera to obtain a fourth left eye image, and the right image 13 The right eye looking at the right image 13 is output by the right eye camera 25 to obtain a fourth right eye image.

As described above, a third left eye image, a right eye image, a fourth left eye image and a right eye image are obtained, and then the position of the cornea is detected by comparing the positions of the corneas shown in the second image.

If the calculated perspective angle is correct, the position of the image after movement coincides with the visual axis of the cyanide. Thus, there is no change in the location of the cornea. And if the calculated perspective is not correct, the position of the image after movement does not coincide with the visual axis of the cyan. Thus, a change in the location of the cornea of the cilia occurs.

If the right eye is left eye, the corneal position of the third left eye image and the fourth left eye image are compared.

The comparison shows that if there is no change in the position of the cornea, the perspective angle calculated in the above calculation step is correct. Accordingly, the perspective angle calculated at the calculation stage can be confirmed as the final perspective angle of the subject.

And if there is a change in the position of the cornea, it means that the perspective angle calculated in the above calculation step is not accurate. In this case, in order to recalculate the correct angle of deviation, a step of correcting the angle of deviation calculated in the calculation step and then re-verifying is additionally performed.

5. Revalidation stage

The re-validation step includes a) analyzing the change in the position of the cornea corresponding to the astigmatism from the secondary image, and obtaining a correction amount of the deviation angle; And shifting one image position, and c) comparing a change in the position of the cornea corresponding to the cyan on the third captured image of the left and right eyes of the examinee.

(a) Perspective  Compensation amount calculation

The correction amount Δθ _s of the deviation angle is obtained from the secondary photographed image.

For example, when the caudal eye is the left eye, the position change value Lc of the cornea is first obtained by comparing the corneal positions of the third left eye image and the fourth left eye image. The change in the position of the cornea can be calculated by the distance between the center of the cornea shown in the third left eye image and the center of the cornea shown in the fourth left eye image.

When the position change value Lc of the cornea is obtained, the angle of deviation correction Δθ _s can be calculated therefrom. For example, tan (Δθ _s ) = Lc / L ₀ . Where L ₀ is Ocular It is the distance between the node (C) and the center (A) of the cornea.

The controller 100 calculates a moving value from the angle correction amount Δθ _s in consideration of the distance between the image and the eye, and then controls the image output unit 10 to display the left and right images 11 and 13 in the cyan. The corresponding image position is moved by a moving value. If the moving direction of the image is the same as the direction in which the deviation is biased, the angle of correction (Δθ _s ) is a positive value. If the moving direction of the image is opposite the direction in which the deviation is shifted, the angle of deviation (Δθ _s ) is negative. .

(b) Comparison of Changes in the Location of Cerebral Corneal

After shifting the image corresponding to the cyanide by the angle of deviation correction (Δθ _s ), the change of the corneal position of the cyanide is compared from the third captured image of the left and right eyes of the subject.

To this end, while simultaneously outputting the left and right images 11 and 13, the left eye looking at the left image 11 is photographed with the left eye camera 20 to obtain a fifth left eye image, and the right eye looking at the right image 13. Is taken with the right eye camera 25 to obtain a fifth right eye image.

Then, while outputting the left and right images 11 and 13 alternately, the left eye looking at the left image 11 when the left image 11 is output is taken with the left eye camera 20 to obtain a sixth left eye image, and the right When the image 13 is output, the right eye looking at the right image 13 is photographed with the right eye camera 25 to obtain a sixth right eye image.

As described above, the fifth left eye image, the right eye image, the sixth left eye image, and the right eye image are obtained, and then the position of the cornea is detected by comparing the positions of the corneas shown in the third image.

If the calculated angle correction amount Δθ _s is correct, the position of the image after the movement coincides with the visual axis of the cyanogen. Thus, there is no change in the location of the cornea. If the calculated angle correction amount Δθ _s is not correct, the position of the image after the movement does not coincide with the visual axis of the cyan. Thus, a change in the location of the cornea of the cilia occurs.

If the right eye is left eye, the corneal position of the fifth left eye image and the sixth left eye image are compared. If the right eye is right eye, the corneal positions of the fifth and six right eye images are compared.

As a result of the comparison, if there is no change in the position of the cornea, it means that the angle correction amount Δθ _s is accurate. Accordingly, the corrected perspective angle is calculated by adding the correction angle Δθ _s to the perspective angle θ _s calculated in the calculation step.

For example, when the angle correction amount Δθ _s is a positive value, the corrected angle of deviation is θ _s + Δθ _s to be. If the angle correction amount Δθ _s is 1, the corrected angle of deviation is θ _s- Δθ _s .

The corrected perspective angle can be confirmed as the final perspective angle of the examinee.

And if there is a change in the position of the cornea, it means that the above-mentioned angle correction amount (Δθ _s ) is not accurate.

In this case, in order to recalculate the correct angle of deviation, the angle of deviation correction is calculated again from the third shot image, and the moving value of the image corresponding to the cyanogen is calculated to move the position of the image by the moving value. After taking the right eye, compare the changes in the position of the cornea.

By repeating the above re-validation process until there is no change in the position of the cornea, the present invention can measure the correct perspective angle.

As described above, the present invention has been described with reference to one embodiment, which is merely exemplary, and those skilled in the art will understand that various modifications and equivalent embodiments are possible therefrom. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1: cover housing 10: image output unit
11: Left video 13: Right video
20: left eye camera 25: right eye camera
30: first transfer unit 39: second transfer unit
40: left eye light source 45: right eye light source
100: control unit 110: power supply unit
120: memory unit 130: operation unit
140: communication unit

Claims (21)

A main body;
An image output unit installed in the main body and separately outputting a left image visible to the left eye and a right image viewed to the right eye;
A photographing unit installed in the main body to photograph the left and right eyes facing the image output unit;
And a control unit configured to adjust positions of the left image and the right image, and calculate a deviation degree of the cyan from the photographed image acquired through the photographing unit. The apparatus of claim 1, further comprising: a light source unit installed at the main body to irradiate light to the left and right eyes. According to claim 1, wherein the main body is provided with a cover housing, the blocking member for separating the inside of the cover housing to the left space portion corresponding to the left eye and the right space portion corresponding to the right eye A four angle automatic measuring device characterized in that. The apparatus of claim 3, wherein the image output unit outputs the left image to the left space and the right image to the right space. The apparatus of claim 4, wherein the image output unit comprises a display configured to separate the left image and the right image from side to side and output the left and right images. The apparatus of claim 4, wherein the image output unit comprises a left eye display for outputting the left image and a right eye display for outputting the right image. 7. The automatic perspective measurement apparatus according to claim 5 or 6, wherein the display is formed in a curved surface. The apparatus for automatically measuring a perspective angle according to claim 3, wherein the photographing unit includes a left eye camera installed in the left space and photographing the left eye, and a right eye camera installed in the right space and photographing the right eye. The automatic perspective measurement apparatus according to claim 8, further comprising camera moving means for independently moving the left eye camera and the right eye camera, respectively. The apparatus of claim 1, further comprising: a first external camera installed in the main body to photograph the front of the main body to obtain a first external video image; and a second external video image installed in the main body to photograph the front of the cover housing. Further provided with a second external camera to obtain,
And the first external image image is output as the left image and the second external image image is output as the right image through the image output unit. An image interval adjusting step of adjusting the distance between the left image seen by the left eye and the right image seen by the right eye according to the distance of both eyes of the subject;
A discriminating step of discriminating a principal eye and a blind eye by comparing the change of the cornea position of the left eye and the right eye from the primary photographed image of the left eye and the right eye of the subject;
And a calculation step of calculating a deviation angle by obtaining the deviation degree of the deviation angle determined in the determination step. 12. The method of claim 11, further comprising a verification step of verifying whether the perspective angle is correct after the calculating step. The method of claim 12, wherein the verifying comprises: a) moving one image position corresponding to the cyan in the left and right images by a movement value calculated from the perspective angle; b) the left eye of the examinee; And comparing the image shifted from the second photographed image of the right eye through the change of the position of the cornea corresponding to the cyan to match the visual axis of the cyan. 15. The method of claim 13, further comprising: a revalidation step of correcting and revalidating the perspective angle when the position of the cornea corresponding to the astigmatism is changed in the verification step. The method of claim 14, wherein the re-validation step comprises: a) obtaining a correction amount of the strabismus angle by analyzing a change in the position of the cornea corresponding to the astigmatism from the secondary photographed image, and b) a moving value calculated from the correction amount. Shifting the position of any one image corresponding to the cyan in the left and right images, and c) comparing the change in the position of the cornea corresponding to the cyan from a third photographed image of the left and right eyes of the subject. Automatic perspective measurement method characterized in that it comprises a step. The method of claim 15, wherein the corrected perspective angle is calculated by adding the correction amount to the perspective angle when there is no change in the position of the cornea corresponding to the cyan in the third captured image. The method of claim 11, wherein the determining comprises: a) photographing the left eye looking at the left image while simultaneously outputting the left and right images, obtaining a first left eye image, and photographing the right eye looking at the right image Acquiring a first right eye image; and b) photographing a left eye facing the left image when the left image is output while the left and right images are alternately output to obtain a second left eye image. Photographing the right eye looking at the right image to output a second right eye image; and c) comparing a change in the corneal position of the first left eye image and the second left eye image, and comparing the first right eye image with the first right eye image. And comparing the change of the corneal position of the second right eye image. 18. The method of claim 17, wherein the determining comprises outputting the first external image image obtained by photographing the front of the subject as the left image, and the second external image image obtained by photographing the front of the subject. Automatic perspective measurement method characterized in that the output to. 12. The method of claim 11, wherein the calculating step calculates a perspective angle by comparing the kappa angle obtained from the principal cyan or the cyan to the deviation angle obtained from the cyan. 20. The method of claim 19, wherein the calculating step comprises the steps of: a) photographing the main cyan and the cyan in a state in which the main cyan and the cyan are lit; Calculating the kappa angle of the main cyan by measuring the distance between the center of the cornea and the reflection point generated on the cornea of the main cyan through the corneal corneal reflection image; Calculating the deviation angle of the cyanide by measuring the distance between the reflected reflection point and the cornea center, and d) calculating the deviation angle of the cyanogen by comparing the kappa angle of the principal cyan and the deviation angle of the cyanide. Automatic measurement of perspective angle. The method of claim 11, wherein the determining comprises: a) photographing the left eye looking at the left image while simultaneously outputting the left and right images, obtaining a first left eye image, and photographing the right eye looking at the right image Acquiring a first right eye image; and b) photographing a right eye when the left image is output while the left and right images are alternately output to obtain a second right eye image, and taking a left eye when the right image is output. Acquiring a second left eye image, and c) comparing a change in corneal position of the first left eye image and the second left eye image, and comparing a change of corneal position of the first right eye image and the second right eye image. Automatic perspective measurement method comprising a step.

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