WO2019205107A1

WO2019205107A1 - Vr technology-based method for optometry and simulation

Info

Publication number: WO2019205107A1
Application number: PCT/CN2018/084922
Authority: WO
Inventors: 方绚莱; 普拉莫·威廉; 冯玉林; 张志飞; 贺晓宁
Original assignee: 深圳摩方材料科技有限公司
Priority date: 2018-04-27
Filing date: 2018-04-27
Publication date: 2019-10-31

Abstract

A VR technology-based method for optometry and simulation, which comprises the following steps: for the same imaging point of an observed object, defining various possible different field of view directions g in one vector space K, and defining a specific field of view direction g in conventional optometry in another vector space K'; defining a mapping matrix T of the two spaces: K'→K; converting various parameters of the specific field of view direction g into parameters of the K space by means of the mapping matrix, thereby obtaining the optimal imaging parameters of a lens comprising the various different field of view directions; the lens made according to the optimal imaging parameters of the lens may meet actual usage requirements; even if the eyeball of a wearer turns to the field of view direction at an edge of the lens, the imaging effect of the lens is still very good.

Description

An optometry and simulation method based on VR technology

The invention relates to the field of optometry technology, in particular to an optometry and simulation method based on VR technology. Background technique

At present, the design of glasses, including glasses, reading glasses, astigmatism and other glasses, is generally designed to wear the a priori light of the demander, and then based on the prescription of the optometry results. The prescriptions obtained by the current optometry system generally include degrees and astigmatism. , the axial position, the prism degree and other optimal imaging parameters of various lenses.

However, in the conventional optometry process, the human eye looks at the instrument in front, and the eyeball is only at a certain rotation angle (ie, a specific field of view), so the data obtained by such optometry is only a parameter of a certain angle. The prescription of the obtained glasses cannot guide the use under the large field of view. That is to say, this optometry method cannot comprehensively consider the imaging effect of the spectacle lens in different direction of the field of view (ie, the different angle conditions of the eyeball rotation), that is, the picture of the entire format that the actual eye needs to see cannot be prescribed by the spectacle lens. The way is expressed. The spectacle lens produced according to the prescription obtained by the conventional optometry can only exhibit the best imaging effect when the eyeball of the human eye is just at the above specific rotation angle. If the wearer's eyeball rotates, the imaging effect of the spectacle lens must be different or The effect is very poor, but in actual use, the rotation of the human eye is randomly occurring. Therefore, the ophthalmic lens produced by the conventional optometry method cannot fully meet the actual needs.

Some optometry also uses VR technology, such as Chinese patent application 201710222691 .3 (patent name: _ VR-based optometry method and VR glasses refractometer, patent application publication number: CN106963334A, application date: April 7, 2017 ), which discloses a VR-based optometry method and a VR glasses refractometer, which establishes a optometry-specific image in the VR system, and adopts a position x and a human eye degree of a clear image seen by the human eye. The relationship between y is y=f(x). The method also proposes that during the optometry process, the user can communicate and feedback with the VR system through the body or language to adjust the sharpness of the image. However, the image clarity referred to by this method is still the same as that of the existing optometry technique, and the optimal lens design parameters of a particular eye rotation direction (ie, under a specific field of view direction) are obtained. If the optometry eyeball turns to a different direction, there is no way to perform normal optometry. Summary of the invention

SUMMARY OF THE INVENTION An object of the present invention is to overcome the above disadvantages and to provide an optometry and simulation method based on VR technology which takes the rotation of the human eye into consideration during the optometry process.

In order to achieve the above object, the technical solution adopted by the present invention is:

An optometry and simulation method based on VR technology, comprising the following steps:

The first step: simulating the direction of the optical axis in the VR system Z, the object to be observed;

In the second step, a lens is simulated in the VR system, and the lens is placed in the direction of the optical axis and placed between the human eye and the observed object, and the human eye observes the observed object through the lens;

The third step: for the same imaging point of the observed object, define various possible different field of view directions g in a vector space K, and define a specific field of view g in the conventional optometry in another vector space K' in;

In a fifth step, various parameters of the specific field of view g are converted into parameters of the K space by the mapping matrix, thereby obtaining optimal imaging parameters of the lens including various different fields of view.

Defined in the K' space, the direction of the rotation of a certain eyeball, g (a, b) vector direction can be perfect imaging, in this vector direction g (a, b), the light energy captured by the human eye is l (a, b, A ) , where A is the wavelength; in the K space, the light energy captured by the human eye in the vector direction g(as, bs) is l(as, bs, A ), according to the above mapping matrix T: K' K, defines the mapping matrix G of two spatial K and K' light energy: l(a, b, in) - l(as, bs, A), and calculates the optimal imaging effect parameters of the lens according to the following formula:

Good imaging effect parameters.

The above calculation formula is used in the vector space. Since the eye rotation of the human eye has different angles, the angles a and b in l(a, b, A) and l(as, bs, A) have various differences. Values, so they are defined as l(a _] , b _j , in) and l(as _] , bS _j , A ), j=1 , . m, where j=1 , . m denotes different angles.

Calculating the final point transfer function according to the above formula for calculating the final point transfer function includes the following steps:

(1) In the K space, for a particular picture, select a series of l(asj, bsj, A), j=1, .m; (2) Calculate the mapping matrix G: l(aj, bj, (asj, bsj, in), j=1, .m;

(3) Calculate the point transfer function f(as, bs, a, b, in);

(4) In the K' space, for the above specific picture, three wavelengths are selected, and the point transfer function f(as, bs, a, b, in) is iteratively calculated;

(5) Substituting the calculation results of the above steps (2) to (4) into the above formula for calculating the final point transfer function, and calculating the final point transfer function f, the final point transfer function f including the lens Optimal imaging parameters.

The VR-based optometry and simulation method further includes a lens verification method, and the lens verification method includes the following steps:

In the first step, the VR system adjusts the simulated lens according to the optimal imaging parameters of the lens obtained in the above steps _ to 5 to form a new lens, and the parameters of the new lens completely conform to the Optimal imaging parameters of the lens;

Step 2: Simulate the human eye to observe the observed object through the new lens, and during the observation process, the eyeball is rotated by different angles to verify the imaging effect of the new lens.

The invention has the beneficial effects that: the invention uses the VR technology to simulate and design the lens, and simulates the human eye to observe the object to be observed through the lens, and passes various parameters in a specific field of view direction in the traditional actual optometry through the mapping matrix. Converting to optimal lens imaging parameters including various fields of view; that is, the present invention considers different directions of eye rotation in the optometry process, thereby producing optimal lens parameters obtained according to the optometry and simulation methods of the present invention. The lens can fully meet the needs of different directions of eyeball rotation in actual use, that is, when the wearer's eyeball rotates to the direction of the field of view of the lens edge, the imaging effect of the lens is also very good, only small astigmatism, chromatic aberration, distortion will appear. That is to say, the present invention combines optometry and simulation with VR technology, thereby providing a complete solution for high-precision optometry and vision correction, and solving the problem of optometry in a single field of view in the prior art. DRAWINGS

1 is a flow chart of a method for optometry and simulation of the present invention;

2 is a schematic view of a g-direction of a g-direction of the eyeball in the method of the present invention;

Figure 3 is a schematic view showing the direction of rotation of the eyeball in two different spaces of K and K' in the method of the present invention; 4 is a schematic diagram of a three-dimensional display model of the progressive multifocal lens curvature in the method of the present invention; FIG. 5 is a schematic diagram showing the curvature of the progressive multifocal lens in the method of the present invention. detailed description

As shown in FIG. 1 , the optometry and simulation method based on the VR technology of the present invention comprises the following steps: Step 1: Simulate the optical axis direction Z in the VR system, the observed object;

The second step: emulating a lens in the VR system, placing the lens in the direction of the optical axis and positioning it between the human eye and the object to be observed, and the human eye observing the observed object through the lens;

As shown in Fig. 2, in the angular coordinate system, the projection component of the vector g(a, b) in the YOZ plane is g _y , the projection component in the XOZ plane is g _x , and the angle in the g ^ Z direction is a, The angle between the g _x Z direction is b, the direction of the optical axis is defined as the Z direction, and the human eye is at the position of the 0 point.

As shown in Fig. 3, the human eye observes the observed object through the lens, and the optical axis is in the z direction. There are two points A and B on the observed object. When the human eye is at a certain angle of rotation of the eyeball, that is, the direction of the field of view is g. _{In A} , the point A can be clearly observed through the glasses. In the direction of the field of view, g _B , the point B can be clearly observed through the glasses, and g A and g _B are specific directions, which are defined in the above vector space K'. In the vector space K, there are any more directions to observe the point A on the object, such as the g _AS direction. Similarly, in the vector space K, there are any more directions to observe the point B on the object, such as g. _BS direction. It can be understood that in the conventional optometry system, the imaging effects of the glasses, such as astigmatism, chromatic aberration, distortion, and the like, are evaluated only in the K' space. The present invention is to convert various parameters of the specific field of view direction g into parameters of the K space through the mapping matrix, that is, to convert the parameters of the K' space into the parameters of the K space through the mapping matrix T, that is, Better imaging conditions in a single field of view translate into better imaging conditions across multiple fields of view. The mapping matrix can reflect how the original imaging quality (astigmatism, chromatic aberration, distortion, etc.) of the lens decreases under the condition of the eyeball rotation. In the angular coordinate system, the mapping matrix T: K' K is understood to be T: (a, b) (as, bs).

In order to better understand the mapping matrix T, defined in the K' space, a certain _ eyeball rotation direction, g (a, b) vector direction can be perfect imaging, or in the traditional optometry mode, the wearer of the glasses is The direction can clearly observe the object to be observed, that is, the lens corrects the astigmatism, chromatic aberration, distortion, etc. to a reasonable range. In this vector direction g(a, b), the light energy captured by the human eye is l(a, b, A), where A is the wavelength; in the K space, the human eye is in the vector direction g(as, bs) The captured light energy is l(as, bs, A), and according to the above mapping matrix T: K' K, the mapping matrix G of the light energy is defined: l(a, b, in) - l(as, bs, A ), and calculate the optimal imaging effect parameters of the lens according to the following formula:

In the formula,

The final point transfer function includes the optimal imaging effect parameters of the lens, and the point transfer function can be understood as an associated relation function of different monochrome images. It can be seen from the above calculation formula that in the K space, the light energy l(as, bs, A) captured by the human eye is equal to the integral of l(a, b, in) and the point transfer function /, . The above calculation formula is used in the vector space. Since the eye rotation of the human eye has different angles, the angles a and b in l(a, b, A)^PI(as, bs, A) have various kinds of different Values, so they must be defined as l(a), b], in) l(asj,bs], in), j=1, .m, where j=1, . m is a different angle.

Calculating the optimal imaging effect parameters of the lens according to the above formula includes the following steps:

(1) In the K space, for a specific picture (that is, a picture that is considered to be relatively clear by a traditional optometry human eye in a certain field of view direction, such as commonly used E sub-tables in various directions, etc.), select a series l(aS _j , bS _j , A ), j=1 , . m ;

(2) Calculate the mapping matrix G: l(a), bj,

(3) Calculate the point transfer function f(as, bs, a, b, in);

(4) In the K' space, for the above specific picture, select the wavelengths of the three lights of F, D, C, and iteratively calculate the point transfer function f(as, bs, a, b, in); (5) Substituting the calculation results of the above steps (2) to (4) into the above calculation formula, and calculating the final point transfer function f, and finally obtaining the point transfer function including the optimal imaging parameters of the lens. The step mapping matrix G is l(a _j , b _j , A) l(aS _j , bS _j , A) , that is, the parameters of the K′ space are converted into the K space, the steps (1) and (2) Then it is the parameter of the known K space, and then the parameters in the K' space are pushed backwards.

The F light is cyan, the wavelength is 486 nm, the D light is yellow light, the wavelength is 589 nm, the C light is red light, and the wavelength is 656 nm.

The point transfer function calculated in steps (2) and (4) is a monochromatic light condition, and the final point transfer function f is the final result considering different wavelengths.

In summary, the present invention considers the rotation of the eyeball in the process of optometry, and converts various parameters in a specific field of view direction of the conventional actual optometry into a matrix containing various fields of view. The lens imaging parameters, that is, the conditions for clear imaging of large-format images in different fields of view will be given, thereby solving the problem of optometry in the single field of view in the prior art.

In the three-dimensional model display of the progressive addition lens shown in Fig. 4, the color differences represent different lens curvature radii.

As shown in Figure 5, the progressive multifocal lens has a constant radius of curvature on one side of the lens, that is, the eyeball is in different directions of rotation, and the degree of the glasses is different. For such a smooth transition of different radius values, the spline curve Different radii of curvature are shown, and the relative magnitude of the radius of curvature is determined by the relative length of the indicator line.

In the smooth transitional progressive multifocal lens of the type shown in Figures 4 and 5, the degrees of the lenses are different in different fields of view, and if the conventional optometry method is used, more errors will be generated, and the present invention is utilized. The optometry and simulation methods provided can effectively reduce the error and improve the optometry precision of such lenses.

Take a progressive multifocal presbyopic lens as an example, that is, if the wearer needs a view Near-field +5.0D reading glasses, at the same time there are other degrees in the far-distance area, there is a transition zone between the near-field and the far-field, and the peripheral area of the glasses. For conventional optometry, such optometry is performed. When the accuracy is required to be accurately matched with the optometry, the error is large; and the +5.0D reading glasses produced by the optimal lens imaging parameters obtained by the method of the present invention are 40 cm away from the glasses, the wearer After the eyeball rotates 35 degrees, the effect of the field of view is observed. The reading lens distortion is less than 2%, the astigmatism in the meridional and sagittal directions is less than 0.03D, and the optometry precision is very high.

In this embodiment, preferably, the optometry and simulation method based on the VR technology of the present invention further comprises a lens verification method, and the lens verification method comprises the following steps:

In the first step, the VR system adjusts the lens designed by the simulation according to the optimal imaging parameters of the lens obtained in the above steps _ to 5 to form a new lens, and the parameters of the new lens completely conform to the Optimal imaging parameters of the lens;

Step 2: Simulate the human eye to observe the observed object through the new lens, and during the observation process, the eyeball is rotated by different angles to verify the imaging effect of the new lens, such as astigmatism, chromatic aberration, distortion and the like.

Thus, the effectiveness of the optimal imaging parameters of the lens obtained by the optometry and simulation methods of the present invention can be further ensured by the lens verification method.

Claims

Claim

1. An optometry and simulation method based on VR technology, characterized in that it comprises the following steps:

2. The VR-based optometry and simulation method according to claim 1, characterized in that: defined in the K' space, a certain _ eye rotation direction, g (a, b) vector direction can be perfect imaging, in this In the vector direction g(a, b), the light energy captured by the human eye is l(a, b, A), where A is the wavelength; in [< space, the human eye is in the vector direction g(as, bs) The captured light energy is l(as, bs, A ), and according to the above mapping matrix T: K' K , a mapping matrix G of two spatial K and K′ light energies is defined: l(a, b, A ) l(as , bs, A), and calculate the optimal imaging effect parameters of the lens according to the following formula:

The imaging effect parameters, da, db, represent the integration of the variables a, b.

3. The VR-based optometry and simulation method according to claim 2, wherein the calculation formula is used in a vector space, and since the eye rotation of the human eye has different angles, l(a, b, The angles a and b in the ml(as, bs, A) have various values, so they are defined as l(a), b _j , in) and l(as _] , bS _j , A ) respectively. , j=1, .m, where j=1, .m denotes different angles.

4. The VR-based optometry and simulation method according to claim 3, wherein: calculating the final point transfer function according to the formula for calculating the final point transfer function comprises the following steps:

(1) In the K space, for a specific picture, select a series of l(asj, bsj, A), j=1, .m;

(2) Calculate the mapping matrix G: l(aj, bj, (asj, bsj, in), j=1, .m; (3) Calculate the point transfer function f(as, bs, a, b, in);

5. The VR-based optometry and simulation method according to claim 1 or 2 or 3 or 4, further comprising: a lens verification method, the lens verification method comprising the steps of: