WO2016064092A1 - New design of model eye lens for visual refractometer correction, and correction method - Google Patents

Abstract

The present invention relates to a standard model eye lens for an optometric visual refractometer and, more specifically, to a standard model eye lens to be used when correcting the optometric visual refractometer, which is a device having a continuous or digital reading device to be used when measuring the refraction of the eyes. To this end, the present invention can provide: a standard model eye lens of which the rear surface part is rough-polished and a reticle is attached or coated on the rough-polished surface thereof; or a standard model eye lens of which the rear surface part is optically polished and a reticle is attached or coated on the optically polished surface thereof. Therefore, the present invention provides an effect of enabling the precise measurement of the focal distance of a standard model eye lens.

Description

New Design and Correction of Eye Lens Correction Model

The present invention relates to a new design of a model eye lens for calibrating an optometry refractometer, and more particularly to calibrating an optometry refractometer, a device having a continuous or digital reading device, which is used when measuring the refractive power of an eye. The new structure of the model eye lens used when

Ophthalmologic examinations include visual acuity, tonometry, and autorefraction.

(Measurement of refraction, measurement of corneal curvature), fundus photography, and a slit lamp. The visual acuity test is a test for measuring how far vision is at a distance. The visual acuity or correction visual acuity of a subject is measured. An intraocular pressure test is a test that measures the change in the surface reflection of the cornea using compressed air. This intraocular pressure test selects glaucoma by measuring a constant intraocular pressure maintained by the inside of the eye. The autorefraction test measures the spherical refractive power, the circular refractive power, the astigmatism side direction, and is a test for correcting visual acuity by checking hyperopia, myopia and astigmatism. Fundus photography is an examination of the retina, the back of the eye. A slit lamp microscope is a test to check the conjunctiva, cornea, anterior, lens, vitreous body, etc. by adjusting the angle of each other with respect to the eye to be examined together with the observation microscope while changing the width and length of the illumination light.

In this case, the refractive power of the eye measured by the visual refractometer in the automatic refraction test is measured by the value of diopter (P, diopter, unit: D) which is the inverse of the object distance of the eye (distance from the object to the lens).

Optometry refractometers are used to test the refractive power of these eyes.

The diopter of the eye of the box is specified. Light from an object's distance passes through the lens or lens and refracts to collect at a point on the retina behind the lens. According to this imaging optical principle, the closer the near object is to the retina, the greater the refractive power of the eye lens and the higher the diopter. If light from an object passes 1 m past the lens or lens and then focuses on the retina, the focal length is 1 m and the refractive power is 1 diopter. A focal length of 2 m results in 0.5 diopters. The larger the absolute value of the diopter, the stronger the refractive power of the lens or lens.

1 is a schematic diagram showing the principle of the optometry refractometer. As shown in FIG. 1, the optometry optometry refractometer 1 includes an image source 10, an objective lens 20, an aperture 30, an light source 40, a slit 50, a CCD camera 60. It can be configured as. When the eye 2 to be examined is placed on one side of the optometry refractometer, astigmatism (non-astigmatism) is obtained through the diameter between the shape of the six pinhole images of the slit 50 observed from the CCD camera 60 and the pinhole images. ) And diopter (diameter between holes). FIG. 2 is a photograph showing a six-point form of six pinhole images observed by the CCD camera 60, and FIG. 3 is an astigmatism and diopter using a Nathan image in the six-dot form observed by the CCD camera 60. FIG. It is a schematic diagram showing the principle of measuring.

The human eye means that the greater the absolute value of the diopter, the greater the myopia or hyperopia. Hyperopia is corrected by focusing with a convex lens (+), and myopia is corrected by focusing with a concave lens (-). Thus myopia is represented by negative diopters and hyperopia as positive diopters.

In the case of myopia, it is classified as mild myopia if it is -3D or less, moderate myopia if -3D to -6D, or high myopia if it is -6D or more. 0D for on-time without wearing glasses. In the case of hyperopia, it is classified as mild hyperopia if less than + 3D, moderate hyperopia if + 3D to + 6D, and highly hyperopia if more than + 6D.

In order to calibrate the optometry optometry, a model eye lens indicating a reference value of a specific diopter is required. 4 is a photograph showing a conventional model eye lens, Figure 5 is a side cross-sectional view showing a conventional model eye lens. As shown in Figs. 4 and 5, the standard model eye lens can be made of polymethyl methacrylate (PMMA) or optical glass. The front surface is also polished to correspond to the optical finish. As shown in FIG. 5A, the conventional model eye lens may have a cylindrical shape having a refractive surface of about R8 (mm) on the front surface thereof, and a toric contact lens having a semicircular shape as shown in b of FIG. 5 ( It may be configured in the form of a toric contact lens.

In addition, in the related art, the rear plane of the standard lens has been defined in KS P ISO 10342: 2002 and ISO 10342: 2003 to be rough polished in a lightly frosted (paint dark gray) so as to serve as a retina.

6 is a schematic diagram showing a state in which the model eye lens 3 is mounted and tested on an optometry refractometer. As shown in FIG. 6, a model eye lens 3 having a reference diopter value that can replace a human eye is used to make and correct a measurement to ensure the accuracy of spherical vertex refractive power measurement of an opto-optic refractometer. do.

The refractive power of the model eye lens is also a function of its lens length (L), the radius of the front spherical surface (R), the refractive index of the material (n) and the wavelength of light (λ). However, because of the spherical aberration of the model eye lens, the conventional ISO regulations stipulate that the refractive power of the model eye lens is predicted by the following method.

a) precision coupled to an optical bench or optical system with a refractive head

The refractive power is measured using an optometry refractometer.

b) measure the length, the spherical diameter of the front surface, the refractive index of the material, and

Measure the refractive power using ray tracing in the same way. Find the point where the luminous flux of 3 mm diameter filling the pupil in the plane on the optical axis and in contact with the refractive surface of the test instrument forms the focal point of the minimum square root of rms behind the scattered light of the test instrument. Then, the refractive power P of the model eye lens is expressed by the following equation.

Where P is the refractive power (diopter) of the standard lens to be displayed, and d is the distance (m) from the refractive surface of the model eye lens to the point light source. (KS P ISO 10342: 2002, ISO 10342: 2003).

However, since the above standard lens refractive power measurement is only an estimate,

There was an unclear problem. In addition, when the rear plane of the standard lens is composed of a sinter glass state, since the reflected light is not clear, the correction of the optometry refractometer has been difficult. In addition, since the rear surface of the standard lens is composed of a glazed state, there is a problem in accurately measuring the focal length or diopter of the standard lens.

Accordingly, the present invention was devised to remedy the problems presented above.

All.

It is an object of the present invention to attach or coat a reticle to a roughly ground back surface or to optically polish (polish) a rear surface and to attach or coat a reticle to the polished back surface or to coat a surface of a parallel plane coated with a reticle. It is to propose a method of bonding to the back plane using a refractive index matching oil of a few um thickness. In other words, to provide a standard reticle-attached standard model eye lens capable of accurately measuring the diopter value of the model eye lens by measuring the distance from the curvature surface of the lens to this image plane by allowing the light from the reticle to form an image. There is an object of the present invention.

Hereinafter, specific means for achieving the object of the present invention will be described.

An object of the present invention, the cylindrical body is configured so that the incident light incident to the front or rear portion can be transmitted in the longitudinal direction, is provided in the front portion of the main body, is configured in a hemispherical configuration so that the incident light can be refracted A standard model eye lens is provided and is provided on one side of the main body, and includes a reticle in the form of a scale configured on an optical axis of the incident light, and is used to calibrate an optometry refractometer. Can be. The organic coupling of the body, the refraction and the reticle has the effect of precisely measuring the focal length of the standard model eye lens.

In addition, the reticle is formed on the rear portion of the body

can do. When the reticle is formed on the rear surface, the effect that the reticle phase can be more clearly formed is generated.

In addition, the reticle has a plurality of scales having a specific thickness in the form of crosses.

It may be characterized by including a cross scale. At this time, in one embodiment of the present invention configured the specific thickness of 10 μm. The reticle including the cross-shaped scale is easy to find the center on the reticle, the effect can be measured more precisely the focal length.

In addition, the reticle has a plurality of scales having a specific thickness in the form of cross

The cross scale to be formed and at least one scale having a specific thickness may include a circle scale configured in a circle shape. The reticle in which the circle scale and the cross scale are combined makes it easy to find the center of the reticle and determine whether the focus is formed, and the effect of measuring the focal length more precisely occurs.

The rear surface of the main body may be optically polished to allow the incident light to pass therethrough, and the incident light may be incident from the rear side of the main body to proceed to the front side of the main body. When the rear part of the main body is optically polished (polished), an effect of measuring a focal length based on straight light instead of reflected light is generated.

In addition, the optically polished back side of the body can directly attach or coat the reticle.

In addition, the rear portion of the main body may be characterized in that rough grinding

have. If the rear part of the body is rough-polished, the rear part of the rough-grinded body can replace the actual retina of the eye, and the reticle can measure the focal length precisely while creating an environment similar to the measurement of the refractive power of the actual eye. The effect is to be generated.

In addition, the rough ground back portion of the main body can be directly attached or coated with a reticle.

In addition, the surface of the rough-grinded rear surface of the main body is adhered via a reticle-coated parallel plate via a refraction matching oil thin film (thickness: W) to produce an effect of precisely measuring a focal length.

In this case, when the thickness of the refractive index matching oil thin film is not zero, that is, a diopter measurement error occurs due to the gap between the rear plane and the reticle, the diopter measurement error related to the focal length change due to the thickness of the matching oil thin film is corrected. Should give.

As described above, the present invention has the following effects.

First, according to one embodiment of the present invention, the focal length of the standard model eye lens can be measured accurately.

Secondly, according to an embodiment of the present invention, there is an effect that can accurately perform the correction of the optometry refractometer.

The following drawings attached to the present specification are preferred embodiments of the present invention.

The present invention is intended to further illustrate the technical spirit of the present invention together with the detailed description of the invention, and therefore the present invention should not be construed as being limited to the matters described in such drawings.

1 is a schematic diagram showing the principle of the optometry refractometer.

FIG. 2 is a photograph showing six dot-shaped pinhole images observed by the CCD camera 60 of an optometry refractometer.

FIG. 3 is a schematic diagram illustrating the principle of measuring astigmatism and diopter with a pinhole image in the form of six dots observed by the CCD camera 60.

4 is a photograph showing a conventional model eye lens.

5 is a side cross-sectional view showing a conventional model eye lens.

6 is a schematic diagram showing a state in which a model eye lens is mounted and tested on an optometry refractometer.

7 is a side cross-sectional view illustrating a model eye lens according to an embodiment of the present invention.

FIG. 8 is an embodiment of a reticle attached or coated to a rear surface of a model eye lens according to an embodiment of the present invention.

FIG. 9 is an embodiment of a model eye lens having a parallel plate coated with a separate reticle on a rear surface of a model eye lens according to an embodiment of the present invention.

FIG. 10 is a schematic diagram illustrating a diopter measuring apparatus of a model eye lens according to a first embodiment of the present invention.

FIG. 11 is a schematic diagram illustrating a diopter measuring apparatus of a model eye lens according to a second exemplary embodiment of the present invention.

12 is a schematic diagram illustrating a diopter measuring apparatus of a model eye lens according to a third embodiment of the present invention.

FIG. 13 is a schematic diagram illustrating definition of diopter values of a model eye lens of the present invention. FIG.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing in detail the principle of operation of the preferred embodiment of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, this includes not only the case where it is directly connected, but also the case where it is indirectly connected with another element in between. In addition, the inclusion of any component does not exclude other components unless specifically stated otherwise, it means that may further include other components.

Model eye lenses

With respect to the model eye lens, FIG. 7 is a side cross-sectional view illustrating a model eye lens according to an embodiment of the present invention. As shown in FIG. 7, the model eye lens 5 according to the exemplary embodiment of the present invention may have a cylindrical shape, and one surface may have a hemispherical surface providing refractive power. In addition, the other surface of the model eye lens 5 according to an embodiment of the present invention may be configured not only in the rough grinding of the prior art, but also optical polishing (polishing) to allow the light to pass through, in one embodiment of the present invention It is proposed a method of attaching the reticle to both the rough-polished rear plane and the optically polished rear plane of to form an image of the reticle to measure the position of the image plane.

7 a) and b) of the back surface rough grinding according to an embodiment of the present invention

A standard model eye lens is shown with a reticle attached to its face, and FIGS. 7C and 7D illustrate a standard in which the rear part is optically polished (polished) and attached to the reticle on its face according to an embodiment of the present invention. A model eye lens is shown.

In addition, a reticle 7 may be formed or coupled to one surface or the other surface of the standard model eye lens 5 according to the exemplary embodiment of the present invention. 8 is a schematic diagram showing a reticle according to an embodiment of the present invention. As shown in FIG. 8, the reticle 7 according to an embodiment of the present invention may be configured in various forms. As the reticle 7 is formed or coupled to at least one of one surface and the other surface of the standard model eye lens 5, the refractive power of the diopter measuring device of the following standard model eye lens can be more easily measured.

As shown in (a) of FIG. 8, the reticle 7 of the standard lens 5 according to the exemplary embodiment of the present invention may have a cross shape having a thickness and an interval of 10 μm. In addition, the reticle (Fig. 7) of the standard model eye lens (Fig. 5 or Fig. 9) according to an embodiment of the present invention as shown in Fig. 8 (b) has a thickness of 10 μm and a diameter of 4 mm, 8 mm It may further comprise a circular scale consisting of.

In relation to a specific embodiment of such a standard model eye lens, Table 1 below describes an embodiment of a focal length, a vertex distance, a diopter value when the VD length is 0 mm, and a length.

When VD is 12 mm or represents another value, the diopter correction equation is

Correction formula for diopter value according to VD = 12 mm

Becomes

In addition, the general formula

Where D0 is the diopter value when VD = 0 mm. In this case, the length of the standard model eye lens is obtained by calculating the minimum square root focus using geometric optical simulation software.

When the VD is changed, the diopter value is changed according to Equation 2, and the corrected lens length value may be changed.

	Focusing distance, cm	D 0 , diopter (VD = 0 mm)	Standard model eye lens length, mm
One	+100/30	+30	16.0094
2	+4	+25	16.8968
3	+5	+20	17.8876
4	+ (100/15)	+15	19.0011
5	+10	+10	20.2613
6	+20	+5.0	21.6995
7	+40	+2.5	22.4974
8	infinity	0	23.3559
9	-40	-2.5	24.2821
10	-20	-5.0	25.2843
11	-10	-10	27.5576
12	-100/15	-15	30.2773
13	-5	-20	33.5890
14	-4	-25	37.7094
15	-100/30	-30	42.9759

Hereinafter, a standard model eye lens diopter measuring apparatus (FIG. 10) using a standard model eye lens (FIG. 5 or FIG. 9) according to an exemplary embodiment will be described.

Diopter measuring device of standard model eye lens

Regarding the diopter measuring apparatus of the standard model eye lens according to the first embodiment, FIG. 10 is a schematic diagram showing the diopter measuring apparatus of the standard lens according to the first embodiment of the present invention.

As shown in FIG. 10, the diopter measuring apparatus of the standard model eye lens according to the first embodiment of the present invention may include an adjusting telescope 120, a light source 110, a collimator 100, and the like. As the standard model eye lens 3 used in the diopter measuring apparatus of the standard lens according to the first embodiment, a standard model eye lens having an optical polishing on the rear surface may be used.

The light source 110 is configured to irradiate light such as LED light or laser light in the longitudinal direction of the standard model eye lens 3 to the rear surface of the standard model eye lens 3. Light irradiated from the light source 110 can be passed through the rear surface of the polished standard model eye lens 3 to the spherical front surface of the standard model eye lens 3, and the light source 110 is passed through the standard model eye lens 3. By irradiating light from the rear part of the lens 3 to the spherical front part of the standard lens 3, the adjusting telescope 120 can easily measure the diopter of the standard model eye lens 3.

The collimator 100 is an optical device for forming parallel rays by being disposed in front of the LED light source where the dispersion of light occurs. The LED light passing through the relimer 100 is formed close to the parallel light and is irradiated to the rear portion of the standard model eye lens 3. When the LED light near the parallel light passes through the zero diopter standard model eye lens 3, it still proceeds to the parallel light. Passage through standard model eye lenses, rather than zero diopters, produces divergent light that is either focused on a focal plane or from a flat plane of distance.

The adjusting telescope 120 is an optical component which checks whether the standard model eye lens 3 is focused by using the light passing through the standard model eye lens 3 in the longitudinal direction. The adjusting telescope 120 may check whether the target light is focused by the naked eye or a CCD camera, and the user may image the hyperplane point of the adjusting telescope 120 by the surface of the standard model eye lens 3 and the LED light illuminated on the reticle. The focal length of the standard model eye lens 3 can be confirmed by measuring the distance between the points.

With reference to the diopter measuring apparatus of the standard lens according to the second embodiment, Figure 10 11 is a schematic diagram showing a diopter measuring apparatus of the standard lens according to the second embodiment of the present invention. As shown in FIG. 10, the diopter measuring apparatus of the standard model eye lens according to the second exemplary embodiment of the present invention is the same as the first exemplary embodiment of the present invention, the adjusting telescope 120, the light source 110, and the collimator 100. The diopter measuring apparatus of the standard model eye lens according to the second embodiment of the present invention, in which the reticle is attached to the rear surface of the standard model eye lens 3 to which the reticle is additionally attached, may be included. According to the embodiment, the rear part may be used for a standard lens which is optically polished (polished) and a reticle is attached to the rear part.

When the reticle 130 is attached to the standard model eye lens according to the second embodiment of the present invention, the user can more accurately check the focal length of the standard model eye lens 3.

Regarding the diopter measuring apparatus of the standard lens according to the third embodiment, FIG. 12 is a schematic diagram showing the diopter measuring apparatus of the standard lens according to the third embodiment of the present invention. As shown in FIG. 12, the diopter measuring apparatus for the standard lens according to the third exemplary embodiment of the present invention is similar to the first exemplary embodiment of the present invention, such as an adjusting telescope 120, a light source 110, a collimator 100, and the like. It may be included, in addition, a device for measuring the distance with a laser interferometer (140, laser interferometer) or a linear scale may be further formed. According to the third embodiment of the present invention, if the interferometer is used as the moving distance of the reticle 130, the user can more accurately check the focal length of the standard lens 3.

Regarding the diopter calculation of the standard model eye lens, FIG. 12 is a schematic diagram of calculating the diopter of the standard lens by using a diopter measuring apparatus of the standard model eye lens according to an embodiment of the present invention. As shown in FIG. 12, the focal length d of the standard model eye lens is precisely measured by the diopter measuring apparatus of the standard lens according to the exemplary embodiment of the present invention, and the inverse of the measured focal length d is taken. The diopter P can be calculated.

As described above, in the art to which the present invention pertains,

Those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features.

Therefore, the above-described embodiments are to be understood in all respects as illustrative and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

1: diopter measuring device

2: eyeball

3: Standard Model Eye Lens

10: image source

20: objective lens

30: aperture

40: light source

50: slit

60: CCD camera

100: collimator

110: light source

120: adjusted telescope

130: reticle

140: laser interferometer

Claims (9)

1. A cylindrical main body configured to allow the incident light incident on the front or rear part to be transmitted in the longitudinal direction, and a refraction unit and the main body provided in the front part of the main body and configured to be refracted in the hemispherical shape. It is formed on one side of, and comprises a reticle of the form of a scale configured on the optical axis of the incident light, the reticle is attached to or coated on the rear plane of the standard model eye lens as a standard lens structure for correction of the optometry optometry Standard model eye lens, characterized in that used.
2. The standard model eye lens of claim 1, wherein the reticle is attached to or coated on a rear surface of the body of the standard lens to form a body.
3. The standard model eye lens of claim 1, wherein the reticle includes a cross scale in which a plurality of scales having a specific thickness are formed in a cross shape.
4. The standard model eye of claim 1, wherein the reticle includes a cross scale having a plurality of scales having a specific thickness in a cross shape and a circle scale having at least one scale having a specific thickness in a circle shape. lens.
5. The rear planar portion of the standard lens body is optically polished to allow the incident light to pass therethrough, and the incident light is incident on the rear plane portion of the main body and proceeds to the front portion of the main body. Standard model eye lens, characterized in that configured to.
6. The method according to any one of claims 1 to 4,

   Standard model eye lens, characterized in that the rear portion of the body is rough grinding.
7. The method of claim 1,

   Considering the refractive index of the optical glass, the radius of curvature 8mm, the wavelength used (547.1 nm), the length and vertex distance, VD = 0 mm, when using bk-7 optical glass,

   The length of the standard model eye lens is a standard model eye lens, characterized in that determined according to Table 1.

   
8. The method of claim 7, wherein

   If the VD is not 0 mm,

   A standard model eye lens, characterized in that the length of the standard model eye lens is changed in consideration of the VD value according to Equation 2 or Equation 3 below.

   Equation 2

   D12 (VD = 12 mm) = D0 / (1 + 0.0012 * D0)

   Equation 3

   Dx (VD = x mm) = D0 / (1 + (x / 1000) * D0)

   In Equations 2 and 3, D0 is a diopter value when VD = 0 mm.
9. The method of claim 2,

   The reticle is attached to or coated on the rear surface portion of the body of the standard lens is formed as a body

   When the standard model eye lens is formed as a body through a matching oil, the standard model eye lens is used to calibrate the opto-optic refractometer by correcting a diopter measurement value by the matching oil thickness. .

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