KR20130031681A - Apparatus and method for measuring axial length of eyeball - Google Patents

Abstract

PURPOSE: An optical axis measuring apparatus and a measuring method of an eyeball are provided to confirm a recognition angle range that the eyeball of an eye-testee can recognize by irradiating the light of a visible light area in the eyeball of the eye-testee, thereby measure the optical axis of the eyeball simply with a low cost. CONSTITUTION: A light source(11) irradiates the light in an eyeball of an eye-testee. A rotating member(26) supports a light source supporting member. A rotation-guiding member(36) supports the rotating member in order to be able to rotate. A distance measuring apparatus measures an advance and retreat distance of the light source supporting member. An angle measuring apparatus measures a rotation angle of the rotating member. A left-right moving apparatus(39) moves the rotation-guiding member in a left and right direction, in a straight line. A lifting apparatus(46) raises the left-right moving apparatus. A controlling apparatus controls an overall operation of the optical axis measuring apparatus.

Description

Apparatus and method for measuring axial length of eyeball

The present invention relates to an eye axis measuring device of the eye, and more particularly to an eye axis measuring device and measuring method of the eye can measure the eye axis of the eye accurately without the use of specialized medical equipment.

Currently, eyeglasses are treated as a single medical product worldwide, and personalized products are preferred as they are exposed to various environments. In line with this, a lot of attention and efforts are being made in the production of personalized spectacle lenses by introducing expensive preform molding machines from the ready-made spectacle lens manufacturing method.

In order to manufacture glasses optimized for an individual, it is necessary to manufacture glasses and frames by accurately measuring refractive index, tilt angle, facial angle, apex distance between glasses and an eye focal point, interpupillary distance, and axle length. At present, items other than the axle length can be considered by the optician to make individual measurements with almost accuracy, but most optometrists and eyeglass lens makers have conventionally carried out ignoring the length of the axle length with individual differences. The situation is to manufacture eyeglasses.

The average person's eye length is known as 24mm, and most eyeglass lenses are manufactured based on this size. Thus, those with average axial lengths can adapt to ready-made spectacle lenses without much effort. However, people with severe astigmatism or nearsightedness, those with large eyesight differences in both eyes, and those with presbyopia feel different from the average axial length and need custom lenses. By the way, if you make a custom spectacle lens using preform equipment on the basis of the average yard, the user feels uncomfortable even if it is custom.

Currently, a measuring device called "IOL Master" is mainly used for measuring the axial length, but this is a preoperative measuring device for cataract patients for ophthalmic cataract. Domestic law does not allow an optician to handle a device that emits light above a certain wavelength, so the optician cannot use an IOL Master that uses light such as ultraviolet rays. Therefore, the optician has the inconvenience of having to receive individual eye-field data through an ophthalmologist, and there is a difference between the data measured by the ophthalmologist and the data used to manufacture the spectacle lens due to the different purpose of using the machine. Not easy to get

As such, optometrists are unable to measure individual yards at present, and expensive personalized spectacle lenses are also manufactured by fixing the yards at 24 mm. Moreover, in the market environment where the optician and the spectacle lens maker are separated, it is not easy to catch the error of the personalized spectacle lens.

In addition, the conventional IOL Master irradiates the eye of the subject eye with ultraviolet light and measures the eye axis length by the time difference between the light and the inner side of the eye. If there is an abnormal eye, the measurement accuracy may decrease due to the difference in refractive index. have.

The present invention is to solve this problem, an object of the present invention is to provide a measuring device and measuring method for the eye axis length can be accurately measured at low cost without using expensive medical equipment that can be used only doctors do.

In accordance with an aspect of the present invention, there is provided an apparatus for measuring an eye length, including: a light source for irradiating light to an eye of a subject, a light source supporting member for supporting the light source, a rotating member for supporting the light source supporting member, and rotating the rotating member. A rotatable guide member capable of supporting the apparatus, a distance measuring apparatus for measuring an advancing distance of the light source supporting member, and an angle measuring apparatus for measuring an angle of rotation of the rotating member, wherein the rotating member is rotated by a predetermined angle. Irradiating light to the eye of the subject with a light source to measure the perceived angle range of the eye of the subject with respect to the light of the light source by moving the light source supporting member at a predetermined interval from the reference position. Repeating while changing the distance between the light source, the perception angle range of the eyeball eye is a standard eyeball Standard if the acceleration to a moving distance from the reference position of the light source for standard axial length of the normal eye and calculates the axial length of the eye to be examined Anja eye to match the angular range.

A device for measuring an axis length according to the present invention includes a light source retracting device for moving the light source supporting member at a predetermined interval from the reference position in the front and rear direction, a rotating device for rotating the rotating member by a predetermined angle, the light source retracting device, and the It may further include a control device for controlling the operation of the rotating device.

The light source retractor, the rotation guide member and Combined back and forth moving member And it may include an actuator for moving the front and rear moving members at regular intervals .

The light source retractor is characterized in that the light source support member Of rotating member  Straight line in the longitudinal direction Actuator  It may include.

Axle length measuring device according to the present invention may further include a left and right moving device for linearly moving the rotation guide member in a direction perpendicular to the moving direction of the light source support member.

An eye-length measuring device according to the present invention may further include a lifting device for lifting the light source.

The device for measuring eye-axis length according to the present invention may further include a condenser lens for condensing light emitted from the light source to irradiate the eye of the eye.

The device for measuring eye-axis length according to the present invention may further include an optical guide member having an optical guide hole for converging the light emitted from the light source to the eye of the eye.

In accordance with the present invention, a method for measuring an axle length according to the present invention includes: (a) placing a light source for irradiating light onto an eye of a subject, which is located at a measurement position, at a reference position; Irradiating light to the eye of the eye of the eye while rotating by a predetermined angle to measure the cognitive angle range of the eye of the eye to the light of the light source, (c) the cognitive angle of the eye of the eye If it is different from the standard recognition angle range, the step of repeating the step (a) while changing the distance between the reference position and the light source by moving the light source by a predetermined interval to repeat the recognition angle range of the eyeball of the subject and the standard recognition angle range (D) moving from the reference position of the light source when the perceived angular range of the eyeball coincides with the standard perceived angular range The acceleration distance of the standard axial length of the normal eye and a step for calculating the axial length of the eye to be examined Anja eye.

In the step (d), when the light source moves in a direction closer to the eyeball of the eye from the reference position and the eye angle range of the eyeball coincides with the standard eye angle range, Equation 1 below is used. The eye axis length of the eyeball is calculated, and the light source moves in a direction away from the eyeball from the reference position so that the recognition angle range of the eyeball coincides with the standard recognition angle range. 2 may be used to calculate the axial length of the eyeball.

(d1: distance traveled from the reference position toward the eye of the subject)

(d2: Distance traveled from the reference position away from the eyeball of the subject)

The eye-axis measuring device according to the present invention can measure the eye-axis length of the eye by using a method of irradiating light in the visible region to the eye of the eye of the subject and confirming the range of cognitive angle that the eye of the eye can recognize. Therefore, without using expensive medical equipment that can be used only by a doctor, a general optician can easily measure the eye's axle length at low cost.

In addition, the conventional medical equipment that uses the parallax that irradiates light to the eye and the light goes to the inner surface of the eye has a problem that the measurement accuracy may be reduced due to the difference in refractive index, the eye field measuring device according to the present invention does not have such a problem. It is possible to measure the eye axis of the eye more accurately.

1 is a perspective view showing a part of the configuration of the eye-axis measuring device according to an embodiment of the present invention.
Figure 2 is a block diagram showing a part of the configuration of the eye-axis measuring apparatus according to an embodiment of the present invention.
FIG. 3 is a diagram for describing a method of measuring an eye axis for a case in which an eye axis of an eyeball of an examinee is longer than an eye axis of a standard eye. FIG.
FIG. 4 is a diagram for describing a method of measuring an eye axis for a case in which an eye axis of an eyeball of an examinee is shorter than that of a standard eye. FIG.
Figure 5 shows a part of the configuration of the eye-length measuring device according to another embodiment of the present invention.
Figure 6 shows a part of the configuration of the eye-length measuring device according to another embodiment of the present invention .

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the eye field measurement device and measuring method of the eyeball according to the present invention.

In describing the present invention, the sizes and shapes of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

1 is a perspective view showing a part of the configuration of the eye-axis measuring apparatus according to an embodiment of the present invention, Figure 2 is a block diagram showing a part of the configuration of the eye-axis measuring apparatus according to an embodiment of the present invention.

As shown in FIG. 1 and FIG. 2, the eye-axis measuring device 10 according to an embodiment of the present invention supports a light source 11 and a light source 11 for irradiating light to the eyeball E of the examinee. The light source support member 13, the light source retractor 23 for advancing and retreating the light source support member 13, the rotary member 26 and the rotary member 26 which support the light source support member 13 to be linearly movable are fixed. Rotating device 32 for rotating by an angle, the rotating guide member 36 for rotatably supporting the rotating member 26, the left and right moving device 39 for linearly moving the rotating guide member 36 in the left and right directions, Lifting device 46 for elevating the left and right moving device 39, and the control device 57 for controlling the overall operation of the eye axis measuring device 10.

The light source 11 irradiates the eye E of the eye to which the eye E of the eye may recognize. As the light source 11, various light emitting devices or lamps capable of generating light in a visible light region such as an LED may be used.

The light source support member 13 includes a support part 14 supporting the light source 11 and a moving part 15 coupled to an end of the support part 14 so as to be linearly movable to the rotating member 26. The support 14 is coupled to the light source 11 as well as the reflector 20 for reflecting the light passing through the condenser lens 19 and the condenser lens 19 to the eyeball E located at the measurement position P1. do. The reflector 20 is coupled to the reflector support member 21, and the reflector support member 21 is hinged to the coupling portion 17 provided in the light source support member 13. If the angle of the reflector support member 21 is adjusted, the irradiation direction of the light reflected from the reflector 20 may be adjusted. The condenser lens 19 collects the light generated from the light source 11 without spreading and forms a small dot in the detection area of the eyeball E.

The light source retractor 23 includes a motor 24 coupled to the rotating member 26 and a screw shaft 25 coupled to the motor 24. The screw shaft 25 is screwed to the moving part 15 of the light source supporting member 13. When the screw shaft 25 rotates in the forward or reverse direction by the action of the motor 24, the moving part 15 moves forward and backward along the rotating member 26. The operation of the light source retractor 23 is controlled by the controller 57. The control device 57 receives the information on the retreat distance of the moving part 15 from the retreat distance detecting sensor 59 and controls the light source retreating device 23 so that the moving part 15 can linearly move at regular intervals. do. The linear movement of the moving part 15 by the light source retraction device 23 can be controlled in mm or in μm.

In addition to the structure using the motor 24 and the screw shaft 25, the structure of the light source retractor 23 may be changed to another structure using other actuators capable of providing a linear force to the moving part 15.

The rotary member 26 is rotatably coupled to the rotary shaft 34 coupled to the rotary guide member 36 to rotate the rotary shaft 34 as the origin. The rotating member 26 is provided with a guide groove 27 for guiding the light source supporting member 13 and a distance display scale 28 for displaying a moving distance of the light source supporting member 13. The optometrist may check the moving distance of the light source supporting member 13 by looking at the distance display scale 28 indicated by the display mark 18 provided on the moving part 15 of the light source supporting member 13.

The rotation angle of the rotating member 26 is limited to a certain angle. For example, the rotation angle of the rotating member 26 may be limited to an angle of 90 degrees or less in the clockwise direction and 90 degrees or less in the counterclockwise direction from the origin. The rotating member 26 is rotated by a predetermined angle by the rotating device 32.

The rotating device 32 includes a motor 33 coupled to the rotation guide member 36 and a rotation shaft 34 coupled to the motor 33. The rotating shaft 34 is coupled to the rotating member 26 and when the motor 33 operates, the rotating member 26 rotates. The motor 33 is capable of forward and reverse driving, and rotates the rotary member 26 by a predetermined angle in a clockwise or counterclockwise direction. For example, the rotating device 32 may rotate the rotating member 26 by one degree in a clockwise or counterclockwise direction.

The rotation guide member 36 rotatably supports the rotation member 26. The rotation guide member 36 is provided with an angle display scale 37 for displaying the rotation angle of the rotation member 26. The optometrist can check the angle of rotation of the rotating member 26 by looking at the angle display scale 37 indicated by the display mark 30 of the rotating member 26 through the display hole 29 of the rotating member 26. Although the rotation guide member 36 is shown in the shape of a disc, the shape of the rotation guide member 36 may be variously changed.

The left and right moving device 39 is for linearly moving the rotary guide member 36 in a direction perpendicular to the moving direction of the light source supporting member 13. The left and right moving members 40 coupled to the rotating guide member 36 and the left and right A guide shaft 41 for guiding the moving member 40, a pair of shaft supporting members 42 for supporting the guide shaft 41, a screw shaft 43 screwed to the left and right moving members 40, a screw A motor 44 for rotating the shaft 43. When the motor 44 is operated to rotate the screw shaft 43 in the forward or reverse direction, the left and right moving members 40 move in the left and right directions. The light source 11 and the reflector 20 connected to the rotation guide member 36 may move left and right by the left and right movement device 39 together with the rotation guide member 36 to irradiate light to both eyes of the examinee. .

Although the figure shows that the left and right moving device 39 linearly moves the left and right moving member 40 with the motor 44 and the screw shaft 43, the structure of the left and right moving device 39 is the rotation guide member 36. It can be changed to another structure that can be moved straight.

The elevating device 46 includes a lifting member 47 coupled with the left and right moving device 39, a guide shaft 48 for guiding the lifting member 47, and a screw shaft 49 screwed with the lifting member 47. And a motor 50 for rotating the screw shaft 49. Guide shaft 48 and screw shaft 49 are coupled to frame 52. When the screw shaft 49 rotates in the forward or reverse direction by the operation of the motor 50, the elevating member 47 is elevated along the guide shaft 48. The height of the light source 11 and the reflector 20 can be adjusted by the operation of the lifting device 46, and the irradiation position of the light by the light source 11 can be adjusted in the vertical direction.

In the figure, the lifting device 46 shows the linear movement of the lifting member 47 using the motor 50 and the screw shaft 49, but the structure of the lifting device 46 is the left and right moving device 39. It can be changed to another structure that can be moved linearly in the vertical direction.

As shown in FIG. 1, the jaw pedestal 55 is coupled to the frame 52 through a connecting member 54. The jaw pedestal 55 is for supporting the examinee's jaw. When the examinee supports the jaw to the jaw pedestal 55, the eyeball E of the examinee is positioned at the measurement position Pe.

As shown in FIG. 2, the control device 57 includes a light source (a light source) from the advancing distance detecting sensor 59, the rotating angle detecting sensor 61, the moving distance detecting sensor 63, and the Shanghai moving distance detecting sensor 65. 11) the input and output of the retreat distance, rotation angle, left and right movement distance, Shanghai distance, light source 11, light source retreat device 23, rotating device 32, left and right moving device 39, lifting device (46) control the operation. In addition, the control device 57 serves to calculate the axial length of the eyeball E of the examinee and output it to an output device such as a display 67. The control device 57 may receive various data from the optometrist through the input device 69 and use the data to control the operation of the axial length measuring device 10 or to calculate the axial length.

In the present invention, the structure of the light source retractor 23, the rotating device 32, the left and right moving device 39, the lifting device 46, these and the light source supporting member 13, the rotating member 26, rotation support The connection structure of the member 36 and the like is not limited to that shown and can be variously changed. In addition, the light source support member 13, the rotation member 26, the rotation support member 36 may be changed to a structure that is manually moved by the optometrist. In this case, the distance display scale 28 provided on the rotating member 26 can be used as a distance measuring device for measuring the retreat distance of the light source supporting member 13 without using the retreat distance detecting sensor, and the rotation angle detecting sensor The angle display scale 37 provided on the rotary support member 36 may be used as an angle measuring device for measuring the angle of rotation of the rotary member 26 without using.

Hereinafter, a method of measuring an eye axis length of an eyeball using an eye axis length measuring device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 3 is a diagram for describing a method of measuring an eye axis for a case in which an eye axis of an eyeball of an examinee is longer than an eye axis of a standard eye. FIG.

First, as shown in FIG. 1, the light source 11 for irradiating light to the eye E of the examinee located at the measurement position Pe is positioned at the reference position. Here, the reference position is the position of the light source 11 in which the standard eye Es having a standard eye axis has a standard recognition angle range. Here, the standard yard may be set to 24 mm, which is the average yard of normal adults.

In order to set the reference position, the standard eye Es of the person having the standard eye Es is positioned at the measurement position P1, and then the light source 11 is rotated by an angle (for example, 1 degree) from the origin. Measure the range of angles at which a person with a standard eye (Es) can perceive light. For example, if a recognition angle of light that can be recognized by a person having a standard eye Es is ± 45 degrees, it is set as a standard recognition angle range α1. When the reference position and the standard recognition angle range α1 are set, it is stored in the control device 57.

Here, the standard recognition angle range α1 is an angle measured by using the eyeball turning point Ps of the standard eye Es as the origin. When you do eyeball movements that move your eyes up, down, left, and right depending on the object you want to see, the gazeline always passes through a certain point in your eye. The eye line point is usually located at the center of the eye, i.e. 1/2 eyeball field.

After the reference position and the standard recognition angle range α1 are set, the subject who needs to measure the axial length is placed at the test position, and the eye E1 is positioned at the measurement position Pe. Initially, the light source 11 is positioned at the reference position and the light source 11 is rotated by a predetermined angle to irradiate the eye E1 to check the perceived angle range α2 with respect to the eyeball E1.

As shown in FIG. 3, when the eye axis of the eyeball E1 is longer than the standard eyeball, the eye turn point P1 of the eyeball E1 is greater than the eye turn point Ps of the standard eye Es. The recognition angle range α2 of the eyeball E1 to the light irradiated from the reference position located at the rear side is different from the standard recognition angle range α1. After checking the critical angle that the eyeball E1 cannot recognize at the reference position, the light source 11 is moved by a predetermined distance using the light source retractor 23, and then the light source 11 is moved at a predetermined angle at that position. While rotating again, the critical angle which the eyeball E1 cannot recognize is measured again.

The light source 11 is moved at regular intervals, and while the light source 11 is rotated by a predetermined angle at each moved position, the process of measuring the critical angle which the eyeball E1 cannot recognize is repeated, When the cognitive angle range α2 of the eye E1 is equal to the standard cognitive angle range α1, the cognitive angle range measurement process is completed. At this time, the distance d1 moved from the reference position of the light source 11 is checked, and it is added to or subtracted from the standard eye field of the standard eye Es to calculate the eye axis length of the eyeball E1 to be examined.

In this case, the eye axis length L of the eyeball E1 of the examinee may be calculated using Equation 1 as follows.

[Equation 1]

Here, 12 represents 1/2 of the standard axis length (24 mm). Since the light source 11 was retracted toward the eye E1 of the examinee in order to match the perceived angle range α2 of the eyeball E with the standard perceived angle range α1, the light source 11 moved from the reference position. ), The moving distance d1 is substituted into Equation 1 as a + value. For example, when the light source 11 retreats 1 mm from the reference position, the eye axis length L of the eyeball E1 to be examined becomes 26 mm.

The calculation of the eye axis length of the eyeball E1 of the examinee is provided by the optometrist to the control device 57 by inputting the moving distance d1 of the light source 11 to the input device 69, or by the regression distance detecting sensor 59. The controller 57 can calculate the advance / remove distance data by the controller 57. The controller 57 can display the calculated eye axis length L of the eyeball E1 on the display 67 or can output it through another output device.

On the other hand, Figure 4 is for explaining the eye axis measurement method for the case where the eye axis of the eyeball of the subject eye is shorter than the eye axis of the standard eye.

First, the reference position and standard recognition angle range α1 are set. The method of setting the reference position and the standard recognition angle range α1 is as described above. After setting the reference position and the standard recognition angle range α1, the subject who needs to measure the axial length is placed at the test position, and the eye E2 is positioned at the measurement position Pe. Initially, the light source 11 is positioned at the reference position and the light source 11 is rotated by a predetermined angle to irradiate the eyeball E2 to check the perceived angle range α3 of the eyeball E2.

As shown in FIG. 4, when the eye axis of the eyeball E2 is shorter than the standard eyeball, the recognition angle range α3 of the eyeball E2 with respect to the light irradiated at the reference position is the standard recognition angle range α1. ). After checking the critical angle that the eyeball E2 cannot recognize at the reference position, the light source 11 is moved by a predetermined distance using the light source retractor 23, and then the light source 11 is moved at a predetermined angle. While rotating again, the critical angle which the eyeball E2 cannot recognize is measured again.

The light source 11 is moved at regular intervals, and the light source 11 is rotated by a predetermined angle at each moved position, thereby repeating the process of measuring a critical angle that the eyeball E2 cannot recognize. When the perceived angle range α3 of the eye E2 is equal to the standard perceived angle range α1, the process of measuring the perceived angle range is finished. At this time, the distance d2 moved from the reference position of the light source 11 is checked, and it is added to or subtracted from the standard eye axis of the standard eye Es to calculate the eye axis length L of the eyeball E2 of the examinee.

In this case, the eye axis length L of the eyeball E2 of the examinee may be calculated using Equation 2 as follows.

&Quot; (2) "

Here, the light source 11 is advanced away from the eyeball E2 of the examinee in order to match the perceived angle range α3 of the eyeball E2 of the subject with the standard perceived angle range α1. The moving distance d2 of the moved light source 11 is substituted into Equation 2 as-value. For example, when the moving distance d2 of the light source 11 advanced from the reference position is 1 mm, the eye axis length of the eyeball E2 to be examined is 22 mm.

As described above, the eye field measuring apparatus 10 according to the present invention utilizes a method of irradiating light in the visible region to the eye of the eye of an eye and confirming a range of cognitive angles that the eye of the eye can recognize. Can be measured. Therefore, without using expensive medical equipment that can be used only by doctors, a general optician can easily measure the ocular length of the eyeball at low cost.

On the other hand, Figure 5 shows a part of the configuration of the eye-length measuring device according to another embodiment of the present invention.

5 is compared to the axle length measuring device 10 shown in FIG. 1, and the path of the light irradiated from the light source 71 is incident on the eyeball E without being changed. It has a structure. The light source 71 is disposed inside the light guide member 72 having the light guide hole 73 to face the subject eye E positioned at the measurement position Pe. The light irradiated from the light source 71 converges on the eyeball E of the examinee while passing through the light guide hole 73.

On the other hand, Figure 6 is another of the present invention Example  by An animal husbandry  The measuring device is shown.

Another of the present invention below Example  by An animal husbandry  In describing the measuring device, it is shown in FIG. An animal husbandry  The same parts as those of the measuring device are given the same reference numerals and detailed description thereof will be omitted.

As shown in Figure 6, another of the present invention Example  by An animal husbandry  The measuring device 80 supports a light source 11 for irradiating light to the eye E of the examinee, a light source support member 13 for supporting the light source 11, and a light source support member 13. Rotating member (26), Rotating member 26  Rotator 32 for rotating by a predetermined angle, Rotating member 26  Rotating Support Rotating Guide member 36, turn Guide member 36  Left and right moving device 39 for linearly moving in the left and right direction, Lifting device 46 for lifting and lowering the left and right moving device 39, An animal husbandry  Control device 57 for controlling the overall operation of the measuring device 10 (Fig. 2 true Joe), the light source 11 Advancing  And a light source retraction device 84 for the device. Light source retractor 84 rotates Guide member 36 By advancing Rotating member 26, the light source support member 14 and the light source 11 Examinee  Away from the eyeball (E) Examinee  In the eyeball (E) Close To get hot Retreat All.

In addition to the other of the present invention Example  by An animal husbandry  Measuring device 80 is the above-described of the present invention In one embodiment  by An animal husbandry  Like the measuring device 10, Examinee  Jaw Support Jaw stand 55, forward and backward distance detection sensor 59, rotation angle detection sensor 61, left and right moving distance detection sensor 63, Shanghai moving distance detection sensor 65, display 67, input device ( 69) more.

The light source retractor 84 is the left and right of the left and right moving device 39. Moving member Before and after the slide movable on the 82 Moving member 85, before and after Moving member (85) Guide  Left and right On the moving member 82  Guide shaft 86 fixed, front and back With the moving member 85  Screw combined screw  Shaft 87, screw  A motor 88 for rotating the shaft 87. Motor 88 is running screw  When the shaft 87 rotates in the forward or reverse direction, the forward and backward moving member 85 end  It moves in the front and rear directions.

The operation of the light source retractor 84 is controlled by the controller 57. The control device 57 is moved forward and backward from the advance distance detecting sensor 59, 85 of  Received information on the advance distance, front and rear moving member (85) Ga-il-Jeong  The light source retractor 84 is controlled to move linearly at intervals. Front and rear moving member 85 by the light source retractor 84 of  The linear movement can be controlled in mm or in μm.

order The moving member 85  The display mark 89 is provided, right and left The moving member 82  order Of the movable member 85  A distance display scale 90 is provided for displaying the moving distance. Optometrists before and after Of the movable member 85  Before and after looking at the distance indication scale 90 indicated by the indication mark 89 Of the movable member 85  The moving distance, that is, the moving distance of the light source 11 can be confirmed.

In the drawing, the light source retraction device 84 is connected to the motor 88. screw  Back and forth moving member (using the shaft 87) 85)  It appears to move in a straight line, but before and after Moving member (85)  Motor 88 for linear movement screw  Axis 87 is different With actuator  Can be changed, before and after Of the movable member 85  The moving structure can also be changed to another structure.

This is another of the present invention Example  by An animal husbandry  Measuring device 80 is the above-described of the present invention In one embodiment  by An animal husbandry  In the same way as the measuring device 10 Examinee  Eyeball (E) Yard  Calculate. That is, the light source 11 is moved at regular intervals using the light source retractor 84, and the light source 11 is rotated by a predetermined angle at each moved position using the rotating device 32. Examinee  By repeating the process of measuring the critical angle that the eye (E) can not recognize, Examinee  Eyeball (E) Yard  Calculate.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention, and the protection scope of the present invention is limited only by the matters described in the claims. Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

10, 70: axle length measuring device 11, 71: light source
13 light source support member 14 support
15: moving unit 17: coupling unit
19: condenser lens 20: reflector
21: reflector support member 23, 84: light source retractor
24, 33, 44, 50, 88: motor 25, 43, 49, 87: screw shaft
26: rotating member 27: guide groove
28: distance display scale 32: rotating device
34: rotating shaft 36: rotating guide member
39: left and right moving device 40, 82: left and right moving member
41, 48, 86: guide shaft 42: shaft support member
46 lifting device 47: lifting member
52 frame 54 connection member
55: jaw support 57: control device
59: forward and backward detection sensor 61: rotation angle detection sensor
63: left and right moving distance detection sensor 65: Shanghai moving distance detection sensor
67: display 69: input device
72: optical guide member 73: optical guide hole
87: front and rear moving member

Claims (10)

A light source for irradiating light to the eye of the examinee;
A light source support member for supporting the light source;
A rotating member supporting the light source supporting member;
A rotation guide member rotatably supporting the rotation member;
A distance measuring device for measuring an advancing distance of the light source supporting member; And
And an angle measuring device for measuring a rotation angle of the rotating member.
Irradiating the eye of the eye of the eye with the light source while rotating the rotating member by a predetermined angle to measure the recognition angle range of the eye of the eye with respect to the light of the light source. Repeating by changing the distance between the eyeball and the light source of the subject eye, and moving from the reference position of the light source when the recognition angle range of the eyeball coincides with the standard recognition angle range of the standard eye. An eye axis measuring apparatus, characterized in that the eye axis length of the eyeball of the subject is calculated by adding or subtracting a distance to a standard eye field of the standard eye.
The method of claim 1,
A light source retracting device for moving the light source supporting member at regular intervals from the reference position in the front and rear directions;
A rotating device for rotating the rotating member by a predetermined angle; And
And a control device for controlling the operation of the light source retractor and the rotating device.
The method of claim 2,
The light source retraction device,
Front and rear moving member coupled to the rotating guide member, And
Axial length measuring device comprising an actuator for moving the front and rear moving members at predetermined intervals.
The method of claim 2,
The light source retracting apparatus includes an actuator for linearly moving the light source supporting member in the longitudinal direction of the rotating member.
The method of claim 1,
Axle length measuring device further comprises a left and right moving device for linearly moving the rotation guide member in a direction perpendicular to the moving direction of the light source supporting member.
The method of claim 1,
A device for measuring the length of the eye field further comprises a lifting device for elevating the light source.
The method of claim 1,
And a condenser lens for condensing the light irradiated from the light source and irradiating the eye of the eye.
The method of claim 1,
And an optical guide member having an optical guide hole for converging light irradiated from the light source to the eye of the eye.
(a) positioning a light source for irradiating light to the eye of the examinee located at the measurement position at a reference position;
(b) measuring a recognition angle range of the eyeball to the eye of the light source by irradiating light to the eye of the eyepiece while rotating the light source by a predetermined angle about an origin;
(c) If the recognition angle range of the eyeball is different from the standard recognition angle range of the standard eye, repeating step (a) while changing the distance between the reference position and the light source by moving the light source by a predetermined interval Matching the cognitive angle range of the eyeball to the standard cognitive angle range; And
(d) calculating the eye axis length of the eyeball by adding or subtracting the distance moved from the reference position of the light source to the standard eyeball length of the standard eye when the recognition angle range of the eyeball coincides with the standard recognition angle range. Step; measuring method of the eye axis characterized in that it comprises a.
The method of claim 9,
In the step (d), when the light source moves in a direction closer to the eyeball of the eye from the reference position and the eye angle range of the eyeball coincides with the standard eye angle range, Equation 1 below is used. The eye axis length of the eyeball is calculated, and the light source moves in a direction away from the eyeball from the reference position so that the recognition angle range of the eyeball coincides with the standard recognition angle range. A method for measuring an eye axis according to claim 2, wherein an eye axis length of the eyeball of the examinee is calculated.

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