Dominant eye determination system, dominant eye determination method, spectacle lens design system, spectacle lens design method and program

Abstract

To optimally determine a dominant eye.SOLUTION: A dominant eye determination system is the dominant eye determination system that determines the dominant eye of a subject, and comprises: a line-of-sight vector acquisition unit that acquires a line-of-sight vector indicating respective line-of-sight motions of both eyes of the subject on a three-dimensional space; a calculation unit that calculates the location on the three-dimensional space of an object capable of being visually recognized by the subject, and a degree of approach of the line-of-sight vector following the object; and a determination unit that determines a more approaching eye as the dominant eye of the subject on the basis of how much the line-of-sight vector approaches toward the object for each of the right and left eyes of the subject.SELECTED DRAWING: Figure 45

Description

Technical Field

[0001] The present invention relates to a dominant eye determination system, a dominant eye determination method, an eyeglass lens design system, an eyeglass lens design method, and a program.

Background Art

[0002] Techniques for providing eyeglass lenses according to the degree of the wearer's dominant eye are known. For example, Patent Document 1 describes a method for designing eyeglass lenses.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] One aspect of the present invention is a dominant eye determination system for determining the dominant eye of a subject, including a line-of-sight vector acquisition unit that acquires a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space, a calculation unit that calculates the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object, and a determination unit that determines, for each of the subject's left and right eyes, the one that is closer based on the degree to which the line-of-sight vector has approached the object as the dominant eye of the subject.

[0005] Another aspect of the present invention is a dominant eye determination method for determining the dominant eye of a subject, comprising: a line-of-sight vector acquisition step of acquiring a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; a calculation step of calculating the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object; and a determination step of determining, for each of the subject's left and right eyes, the eye that is closer based on the degree to which the line-of-sight vector approaches the object as the dominant eye of the subject.

[0006] Another aspect of the present invention is a program for causing a computer to determine the dominant eye of a subject, the program causing the computer to execute: a line-of-sight vector acquisition step of acquiring a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; a calculation step of calculating the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object; and a determination step of determining, for each of the subject's left and right eyes, the eye that is closer based on the degree to which the line-of-sight vector approaches the object as the dominant eye of the subject.

[0007] Another aspect of the present invention is an eyeglass lens design system for designing an eyeglass lens for a subject, comprising: a line-of-sight vector acquisition unit that acquires a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; a calculation unit that calculates the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object; and an eyeglass lens design unit that designs an eyeglass lens using a convex hull region that includes the trajectory of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject.

[0008] Another aspect of the present invention is an eyeglass lens design method for designing an eyeglass lens for a subject, the method including: a line-of-sight vector acquisition step of acquiring a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; a calculation step of calculating the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object; and an eyeglass lens design step of designing an eyeglass lens using a convex hull region including the locus of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject.

[0009] Another aspect of the present invention is a program for causing a computer to design an eyeglass lens for a subject, the program including: a line-of-sight vector acquisition step of acquiring a line-of-sight vector indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; a calculation step of calculating the position of an object visible to the subject in the three-dimensional space and the degree of approach of the line-of-sight vector following the object; and an eyeglass lens design step of designing an eyeglass lens using a convex hull region including the locus of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject.

Brief Description of the Drawings

[0010]

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Mode for Carrying Out the Invention

[0011] Regarding the dominant eye determination system, the dominant eye determination method, the spectacle lens design system, the spectacle lens design method, and the program according to the aspect of the present invention, preferred embodiments will be described in detail below with reference to the accompanying drawings. Note that the aspects of the present invention are not limited to these embodiments, and also include those with various modifications or improvements added. That is, the constituent elements described below include those that can be easily assumed by those skilled in the art and substantially the same ones, and the constituent elements described below can be combined as appropriate. Also, various omissions, substitutions, or changes of the constituent elements can be made without departing from the gist of the present invention.

[0012] [Embodiment] In the state of wearing spectacle lenses, the arithmetic mean of the maximum refractive power and the minimum refractive power of the spectacle lenses at the position where the light ray passing through the center of rotation (center of rotation) of the eyeball intersects the surface on the object side or the eyeball side of the spectacle lenses is defined as the average refractive power. Hereinafter, unless otherwise specified, "refractive power" refers to this average refractive power. The difference between the maximum refractive power and the minimum refractive power of the spectacle lenses in the light ray passing through the center of rotation is defined as the spherical aberration. These refractive powers and spherical aberrations are values obtained by appropriately removing the spherical power, cylindrical power, and astigmatic axis angle components necessary for correcting the aberrations of the wearer's eyes specified in the wearer's prescription data to achieve complete correction, taking into account Listing's law in eye movement.

[0013] In this embodiment, the spectacle lens is designed based on information about the wearer's dominant eye (hereinafter, may also be referred to as the dominant eye) when viewing objects at different distances. The type of spectacle lens to be designed is not particularly limited, and it can be a single-focus lens, a bifocal lens, a progressive power lens, or the like. The progressive power lens designed in this embodiment may be any of an outer surface progressive lens, an inner surface progressive lens, or a double-sided progressive lens. Here, the outer surface progressive lens is a spectacle lens having the lens surface on the object side as the progressive surface. The inner surface progressive lens is a spectacle lens having the lens surface on the eyeball side as the progressive surface. The double-sided progressive lens is a spectacle lens having both the lens surface on the object side and the lens surface on the eyeball side as the progressive surfaces. For a wearer who has been prescribed for astigmatism, in any case of the progressive power lens, a surface obtained by adding a cylindrical surface or a toric surface or the like to the spherical surface or the progressive surface on the eyeball side can be provided with an astigmatism correction function.

[0014] The spectacle lens designed in this embodiment is not particularly limited, but can be manufactured using a semi-finished lens. For example, in the case of an inner surface progressive lens, the spherical surface on the object side is a surface having a fixed constant curve value within a predetermined diopter range defined by the base curve section. In the case of an outer surface progressive lens and a double-sided progressive lens, the surface on the object side is a surface obtained by adding a spherical surface with a constant curve value and a progressive surface with a constant addition power within a predetermined diopter range. In any case of the spectacle lens, the surface on the object side is a reference surface that is not further processed. Based on the prescription data and fitting parameters of the wearer with reference to the surface on the object side of this semi-finished lens, the surface on the eyeball side to be processed is calculated and processed. A complex lens surface with various corrections such as suppression of aberration can be processed. Here, the prescription data of the wearer can include at least one of the distance diopter, the near diopter, the astigmatism diopter, the addition diopter, and the prism. The fitting parameters can include at least one of the frame tilt angle, the forward tilt angle, and the corneal vertex distance.

[0015] The following describes an example of designing the shape of the surface of the lens on the eye side of a progressive lens using a semi-finished lens. However, the method for designing spectacle lenses according to this embodiment is not limited to the following example as long as the design is carried out using information about the wearer's dominant eye when viewing objects at different distances.

[0016] FIG. 1 is a conceptual diagram showing each part of the spectacle lens designed in this embodiment. In an example shown, the spectacle lens LS is a progressive power lens. The spectacle lens LS is in a state before the lens is processed according to the shape of the spectacle frame (before rough grinding), and is formed in a circular shape in plan view. The upper side of the spectacle lens LS in the figure will be arranged upward when worn, and the lower side in the figure will be arranged downward when worn. The spectacle lens LS has a distance vision portion F, a near vision portion N, and an intermediate portion P.

[0017] The distance vision portion F is arranged at the upper part of the spectacle lens LS, and the near vision portion N is arranged at the lower part of the spectacle lens LS. After the spectacle lens LS is processed for spectacles, the distance vision portion F will be a portion having a refractive power corresponding to a longer distance compared to the near vision portion N. In other words, the distance vision portion F is a portion for viewing an object at a longer distance than the distance to the object viewed through the near vision portion N. The intermediate portion P is arranged in the middle of the distance vision portion F and the near vision portion N of the spectacle lens LS, and the refractive power between the distance vision portion F and the near vision portion N changes continuously and smoothly as appropriate and is connected.

[0018] The spectacle lens LS has a plurality of reference points. Such reference points include, for example, as shown in the figure, the eye point EP, the prism reference point PRP, the distance vision reference point FV, and the near vision reference point NV. The eye point EP may sometimes be called the fitting point. The eye point EP serves as a reference point for the position of the pupil when the wearer wears the spectacle lens LS. The eye point EP may be arranged at the intermediate part P. The prism reference point PRP is the position where the prism amount becomes a 0 (zero) value and is also the design center. The distance vision reference point FV serves as a measurement reference point for measuring the distance prescription of the lens. The near vision reference point NV serves as a measurement reference point for measuring the near prescription of the lens. Using mm as the unit, like the coordinate system 800 shown in the figure, the position on the spectacle lens LS is indicated by the X1 coordinate taken in the left-right direction and the Y1 coordinate taken in the up-down direction, and is denoted as (X1, Y1). The origin (0, 0) is the geometric center O. As an example, the position of the distance vision reference point FV can be (+2.5, +8.0) or (+2.5, +15.0), the position of the eye point EP can be (+2.5, +2.0), (+2.5, +3.0) or (+2.5, +4.0), the position of the prism reference point PRP can be (+2.5, +0.0), and the position of the near vision reference point NV can be (+2.5, -12.0). However, it is not limited to these examples, and positions shifted appropriately by 0 mm to several mm in the up-down direction or the left-right direction can also be adopted according to the progressive addition zone length or the model, etc. Also, the positional relationship between the geometric center O and the design center (i.e., the prism reference point PRP) is not limited to the above examples, and they may coincide with each other.

[0019] At approximately the center of the spectacle lens LS, there is a main line of sight M, which is a virtual line on the lens through which the line of sight passes when the wearer views an object from directly above the front to directly below the front. The main line of sight M is also called the principal meridian. In the distance vision portion F, the main line of sight M is set along the direction corresponding to the vertical direction during wearing (hereinafter referred to as the "vertical direction") passing through the eye point EP and the distance reference point FV. In the near vision portion N, the main line of sight M is set along the vertical direction passing through the near vision reference point NV. The near vision reference point NV is shifted inward toward the nasal side (right side in an illustrated example) in consideration of convergence. A part of the main line of sight M is set obliquely with respect to the vertical direction in the intermediate portion P in order to connect the distance reference point FV and the near vision reference point NV.

[0020] The spectacle lens LS may be a bifocal lens or a varifocal lens. In the bifocal lens, for example, it is designed to preferably view an object at a long distance or an intermediate distance through the distance vision portion F, and to preferably view an object at a short distance through the near vision portion N. In the varifocal lens, for example, it is designed to preferably view an object at a long distance through the distance vision portion F, and to preferably view an object at a short distance through the near vision portion N. The distances corresponding to the long distance, the intermediate distance, and the short distance vary depending on the country / region, the use of the spectacle lens, etc. and are not particularly limited. For example, the long distance is 1 m or more, the intermediate distance is 50 cm or more and less than 1 m, and the short distance is 25 cm or more and less than 50 cm.

[0021] In this specification, "dominant eye" or "ocular dominance" means the sensory dominant eye, which refers to the eye that is dominant in the competing state when each eye views different visual stimuli.

[0022] Although various empirical methods for identifying a patient's dominant eye are known, these have been found to be unreliable because they are actually completely influenced by the skill and ease with which the patient uses them.

[0023] One very common method is the "hole-in-card test" or the "hole-in-card" method, also called the Dolman method.

[0024] This method has been found to be one of the most reliable ways to identify an individual's dominant eye. This is · to hand the patient a card with a hole in the center, and · to tell the patient to hold this card with both hands and stretch out their arms straight, and then · to tell the patient to keep both eyes open and look through the hole at a target placed at a distant position in front of them (the viewing position is the position where the subject perceives the target in the center of the hole) including.

[0025] After that, the patient alternately closes one eye to identify their dominant eye, which is actually the eye that aligns with the target and the hole. Therefore, if the target remains in the center of the hole when the patient closes their left eye, the right eye is the dominant eye. Conversely, if the target remains in the center of the hole when the patient closes their right eye, the left eye is the dominant eye. This method can identify the dominant eye, but it cannot quantify eye dominance.

[0026] However, quantifying eye dominance can be an important point for accurately personalizing the prescribed correction and / or the calculation and machining of the patient's lenses. Therefore, it can thereby accurately achieve the balance between the two eyes required for good and comfortable binocular vision for any viewing distance (from near vision to far vision) as the case may be.

[0027] The dominant eye is known to vary in ratio even in the same person depending on the environment through experiments. The experiment described below was conducted using a head-mounted display VR with an eye tracker. In a head-mounted display VR, the environment in the virtual space can be easily changed. That is, using a head-mounted display VR, an environment close to the living environment can be realized as a virtual environment. Furthermore, by using an eye tracker, it is possible to capture the state of the subject's eyes, such as the movement of the line of sight and the opening and closing of the eyes including blinking, in the virtual environment.

[0028] First, with reference to FIGS. 2 to 10, the first experimental method and experimental results will be described.

[0029] FIG. 2 is a diagram for explaining the concept of an experiment in which a subject tracks an object with their line of sight in the virtual environment according to the present embodiment. With reference to this figure, an example of a simple implementation according to the present embodiment will be described. Note that by preparing an environment close to the living environment, more accurate dominant eye data can be obtained. Here, for the sake of simplicity, a simple example in which a subject tracks an object (for example, a sphere) with their line of sight will be described.

[0030] The head-mounted display VR used in the present embodiment emits near-infrared light into the pupil, and measures the line of sight by the reflection of the cornea. In this method, when wearing glasses, there are cases where the line of sight measured under the influence of the glasses lens cannot be used as it is. In that case, a method of measuring the line of sight while wearing contact lenses or correcting the line of sight obtained while wearing glasses lenses considering the influence of the glasses lenses can be considered.

[0031] Note that in the present embodiment, it is also assumed that the subject does not need to wear glasses or contact lenses and can be measured with naked eyes. In this case, it is preferable that the head-mounted display VR has a function of adjusting the focal length. By using the function of adjusting the focal length, the subject can focus and view in the virtual environment even with naked eyes. In the simple example shown below, the case where the subject is wearing contact lenses will be described.

[0032] This figure shows a diagram in which the subject is sitting on a chair and wearing the head-mounted display VR. The world coordinates of the subject (the coordinate unit is, for example, 1 [cm]) are centered on the subject in the x-z plane, and the floor is used as a reference in the y-axis direction. That is, the reference point (x, y, z) = (0, 0, 0) is at the subject's feet. In this case, for example, the head position of the subject is (x, y, z) = (0, 120, 0).

[0033] The subject undergoes an experiment of tracking a sphere, which is an example of an object moving in a virtual environment, with their line of sight. Initially, the sphere is stationary in front of the subject's eyes, i.e., at (x, y, z) = (0, 120, -100). After 1,000 [ms], the sphere moves +50 in the x-coordinate direction and then -50 in the x-coordinate direction. This is repeated 3 times over 3,000 [ms]. Next, the sphere moves -50 in the z-axis direction and then +50 in the z-axis direction. This is repeated 3 times over 3,000 [ms]. Next, the sphere moves +50 in the y-axis direction and then -50 in the y-axis direction. This is repeated 3 times over 3,000 [ms]. Such movements in the x, y, and z directions are regarded as one movement batch, and this movement batch is repeated 3 times.

[0034] In this embodiment, an example of the case of moving separately with respect to the x-axis, y-axis, and z-axis has been described. However, this embodiment is not limited to this example, and the sphere may be given three-dimensional movement. The case of giving the sphere three-dimensional movement can be exemplified, for example, by assuming the driving of a vehicle. When assuming the driving of a vehicle, an object existing outside the vehicle that is visible from the driver's seat will always have a relative movement in the depth direction. Therefore, the sphere may be moved by combining the assumed direction of an object existing outside the vehicle and the depth direction.

[0035] In this embodiment, an example of the case of moving the sphere the same distance with respect to the x-axis, y-axis, and z-axis around a reference point has been described. However, this embodiment is not limited to this example, and the sphere may be moved with a predetermined point as a reference. The predetermined point may be based on, for example, a virtual space. For example, when assuming the driving of a vehicle, the sphere may be moved with the direction visible from the driver's seat (the center of the driver's line of sight during driving) as the reference point.

[0036] FIG. 3 is a diagram showing the line-of-sight vector of the left eye ball of the subject in the virtual space according to the present embodiment. In the figure, the left eye ball of the subject shown in FIG. 2 and its line-of-sight vector are shown. Also, the coordinate change of the moved sphere is shown in the figure. Ideally, it is preferable that the sphere exists on the line-of-sight vector. However, in reality, it is not easy to make the line-of-sight vector follow the moving sphere, and a distance error occurs. The figure shows the coordinates when the line-of-sight vector is closest to the coordinates where the sphere is located. According to the present embodiment, in the three-dimensional space, by taking the coordinates when the line-of-sight vector is closest to the target sphere, it becomes possible to analyze in detail how the line-of-sight captures the target.

[0037] FIG. 4 is a diagram showing the change in the coordinates of the sphere when the sphere is moved and the change in the coordinates when the line-of-sight vector of the left eye ball is closest to the sphere in the virtual space according to the present embodiment. The change in the coordinates of the sphere when the sphere is moved is shown as "target position", and the change in the coordinates when the line-of-sight vector of the left eye ball is closest to the sphere is shown as "focus near". FIG. 4(A) shows the change in the X coordinate component, FIG. 4(B) shows the change in the Y coordinate component, and FIG. 4(C) shows the change in the Z coordinate component. The vertical axis represents the coordinate value, and the unit is [m]. The horizontal axis represents time, and the unit is [ms]. Also, for ease of handling experimental data, the sign of the Z coordinate component is opposite to the world coordinates of the virtual environment.

[0038] Figure 5 shows the coordinates of the sphere when the sphere is moved in the virtual space according to this embodiment, and the changes in the coordinates when the line-of-sight vector of the right eye sphere is closest to the sphere. The change in the coordinates of the sphere when the sphere is moved is shown as "target position", and the change in the coordinates when the line-of-sight vector of the right eye sphere is closest to the sphere is shown as "focus near". Fig. 5(A) shows the change in the X coordinate component, Fig. 5(B) shows the change in the Y coordinate component, and Fig. 5(C) shows the change in the Z coordinate component. The vertical axis represents the coordinate value, and the unit is [m]. The horizontal axis represents time, and the unit is [ms]. Also, to make the experimental data easier to handle, the sign of the Z coordinate component is opposite to that of the world coordinates of the virtual environment.

[0039] From the coordinate changes shown in FIGS. 4 and 5, it can be seen that although the coordinate change of the sphere is only in one axis, the coordinate change of the line-of-sight vector not only stays in that direction but also has an impact on the remaining directions. It is presumed that there are individual differences in the degree of this influence and the relationship with the dominant eye. In this embodiment, the components in the three directions are converted into distances, and the one with the smaller distance (i.e., the one closer to the sphere) is regarded as the dominant eye. Note that x d =x t -x e , y d =y t -y e , z d =z t -z e Then, the following formula (1) may be used as the distance conversion formula.

[0040]

Equation

[0041] Note that the meanings of the respective symbols are as follows. x t : The change amount of the X coordinate component of the sphere x e : The change amount of the X coordinate component of the line of sight x d : The difference between the change amounts of the X coordinate components of the sphere and the line of sight y t : Change amount of the Y coordinate component of the sphere y e : Change amount of the Y coordinate component of the line of sight y d : Difference between the change amounts of the Y coordinate components of the sphere and the line of sight Z t : Change amount of the Z coordinate component of the sphere z e : Change amount of the Z coordinate component of the line of sight z d : Difference between the change amounts of the Z coordinate components of the sphere and the line of sight

[0042] Figure 6 is a diagram showing the coordinate changes when the line-of-sight vector is closest to the sphere when the sphere is moved in the virtual space according to the present embodiment. In this figure, the average value obtained by dividing the distance data when the line-of-sight vector of the left eye globe shown in Figure 4 is closest to the sphere by the number of data, and the average value obtained by dividing the distance data when the line-of-sight vector of the right eye globe shown in Figure 5 is closest to the sphere by the number of data are shown with respect to the time change. Also in this figure, the vertical axis represents the coordinate value and the horizontal axis represents the time.

[0043] The average value of the distance between the sphere and the line of sight of the left eye is shown as "left diff". The average value of the distance between the sphere and the line of sight of the right eye is shown as "right diff". As is clear from the figure, since the average value of "left diff" is lower, it can be seen that the dominant eye of the subject in the illustrated example is the left eye. Also, looking at the figure, it can be seen that there is a part where the results are swapped (around exceeding 5,000 [ms]). Therefore, it can be understood that in order to determine the dominant eye, more stable results can be obtained by conducting repeated experiments a certain number of times or more and calculating the average value up to that point.

[0044] The average value of the distance between the sphere and the line of sight of the left eye up to that time, "left diff", can be expressed by the following formula (2).

[0045]

Equation

[0046] Also, the average distance "right diff" between the sphere and the line of sight of the right eye until that time can be expressed by the following formula (3).

[0047]

Equation

[0048] Here, consider the position of the line of sight passing through the spectacle lens. In the experiment described with reference to FIGS. 2 to 6, if the lens is in front of the eye, the simple calculation results in the following as described below. In the following description, the corneal vertex distance VD is calculated as 12 [mm], but this distance varies depending on the wearer. Therefore, in actual operation, the corneal vertex distance VD of the wearer may be obtained and reflected in the calculation.

[0049] Also, in the following description, the lens is regarded as a simple plane, but the actual lens surface is a free-form surface on both the front and back surfaces. Also, the position where the line-of-sight vector passes through the lens surface also changes. Therefore, in actual operation, a different free-form surface for each lens may be obtained and reflected in the calculation. However, the free-form surface is the free-form surface calculated by the conventional calculation that does not consider the dominant-eye design. Also, since the actual lens has refractive power, in actual operation, it is also conceivable to correct the position considering the refractive power.

[0050] FIG. 7 is a diagram showing the position of the line of sight passing through the spectacle lens of the left eye according to the present embodiment. The frame shape of the spectacle lens is shown as symbol LS-L. The frame shape shown in the figure is displayed in the direction of viewing from the eyeball side to the sphere side. (x, y) = (0,0) is the prism reference point (or optical center) PRP. The position of the line of sight shown in the figure is represented by the color shown in the gradient bar shown on the right side of the figure according to the position (distance difference) where the line of sight passes through the sphere.

[0051] FIG. 8 is a diagram showing the position of the line of sight passing through the left eyeglass lens according to the present embodiment. The frame shape of the eyeglass lens is denoted by reference sign LS-R. The frame shape shown in the figure is displayed in the direction of viewing from the eyeball side to the spherical side. (x, y) = (0, 0) is the prism reference point (or optical center) PRP. The position of the line of sight shown in the figure is represented by the color shown in the gradation bar shown on the right side of the figure according to the position (distance difference) where the line of sight passes through the sphere.

[0052] Here, for a position where the distance difference of the line of sight from the sphere is large, it can be determined that the sphere cannot be captured. In general, a filter may be used to select only reliable data from the point cloud data. However, for the line-of-sight data for determining the dominant eye, it is considered that those with a large distance difference between the object and the line of sight can be excluded as unreliable data.

[0053] FIG. 9 is a diagram showing an example of the position of the line of sight passing through the left eyeglass lens according to the present embodiment when unreliable data is excluded. Specifically, the example shown in the figure is a plot diagram when the line-of-sight data with a distance difference of 50 cm or more is deleted in the example shown in FIG. 7.

[0054] FIG. 10 is a diagram showing an example of the position of the line of sight passing through the right eyeglass lens according to the present embodiment when unreliable data is excluded. Specifically, the example shown in the figure is a plot diagram when the line-of-sight data with a distance difference of 50 cm or more is deleted in the example shown in FIG. 8.

[0055] In FIG. 9, the convex hull region enclosing the position of the line of sight is denoted by reference sign CA-L. Further, in FIG. 10, the convex hull region enclosing the position of the line of sight is denoted by reference sign CA-R. According to the present embodiment, the eyeglass lens may be designed using this convex hull region as a design region considering the dominant eye. The convex hull region is a region that includes the locus of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject.

[0056] Next, with reference to FIGS. 11 to 16, the second experimental method and experimental results will be described. In the second experimental method, it is different from the first experimental method in that the positions of the subject and the sphere are relatively different.

[0057] FIG. 11 is a diagram for explaining an experiment in which a subject visually tracks an object existing on the left side of the subject in a virtual environment according to the present embodiment. Similar to FIG. 2, this figure shows a diagram in which the subject is sitting on a chair and wearing a head-mounted display VR. FIGS. 2 and 11 show different positions where the subject exists. In FIG. 11, the subject exists at (x, y, z) = (-60, 120, 0). Since the coordinates of the positions where the sphere exists in FIGS. 2 and 11 are (x, y, z) = (0, 120, -100) and are the same as each other, relatively speaking, the sphere exists in front of the left side of the subject.

[0058] It is assumed that the movement of the sphere in the second experimental method is the same as that in the first experimental method. That is, initially, it is stationary at (x, y, z) = (0, 120, -100). After 1,000 [ms], the sphere moves +50 in the x-coordinate direction and then -50 in the x-coordinate direction. This is repeated 3 times for 3,000 [ms]. Next, the sphere moves -50 in the z-axis direction and then +50 in the z-axis direction. This is repeated 3 times for 3,000 [ms]. Next, it moves +50 in the y-axis direction and then -50 in the y-axis direction. This is repeated 3 times for 3,000 [ms]. Such movements in the x-direction, y-direction, and z-direction are regarded as one movement batch, and this movement batch is repeated 3 times.

[0059] FIG. 12 is a diagram showing changes in coordinates when the line-of-sight vector is closest to the sphere in an experiment in which a subject according to this embodiment follows an object existing on the left side of the subject with the line of sight while moving the sphere. In the figure, similar to FIG. 6 which is the result of the first experiment, the average value obtained by dividing the distance data when the line-of-sight vector of the left eye globe is closest to the sphere by the number of data, and the average value obtained by dividing the distance data when the line-of-sight vector of the right eye globe is closest to the sphere by the number of data are shown with respect to the time change. In this figure, the vertical axis represents the coordinate value and the horizontal axis represents the time.

[0060] The average value of the distance between the sphere and the line of sight of the left eye is shown as "left diff", and the average value of the distance between the sphere and the line of sight of the right eye is shown as "right diff". As is clear from the figure, since the average value of "right diff" is lower, it can be seen that the dominant eye of the subject in the illustrated example is the right eye. Here, both the first experiment and the second experiment are by the same person, but the dominant eye in the first experiment is the left eye, and the dominant eye in the second experiment is the right eye. That is, depending on the position of the sphere, the dominant eye changes.

[0061] FIG. 13 is a diagram showing the position of the line of sight passing through the left eye spectacle lens in an experiment in which a subject according to this embodiment follows an object existing on the left side of the subject with the line of sight. The frame shape of the spectacle lens is shown as LS-L. The frame shape shown in the figure is displayed in the direction of looking from the eyeball side to the sphere side. (x, y) = (0, 0) is the prism reference point (or optical center) PRP. The position of the line of sight shown in the figure is represented by the color shown in the gradation bar shown on the right side of the figure according to the position (distance difference) through which the line of sight passes with respect to the sphere.

[0062] FIG. 14 is a diagram showing the position of the line of sight passing through the right-eye spectacle lens in an experiment in which a subject according to the present embodiment follows an object existing on the left side of the subject with the line of sight. The frame shape of the spectacle lens is shown as LS-R. The frame shape shown in the figure is displayed in the direction of viewing from the eyeball side to the spherical side. (x, y) = (0, 0) is the prism reference point (or optical center) PRP. The position of the line of sight shown in the figure is represented by the color shown in the gradation bar shown on the right side of the figure according to the position (distance difference) through which the line of sight passes with respect to the sphere.

[0063] FIG. 15 is a diagram showing an example in the case where unreliable data is excluded regarding the position of the line of sight passing through the left-eye spectacle lens in an experiment in which a subject according to the present embodiment follows an object existing on the left side of the subject with the line of sight. Specifically, the example shown in the figure is a plot diagram in the case where the line-of-sight data with a distance difference of 50 [cm] or more is deleted in the example shown in FIG. 13. In FIG. 15, the convex hull region obtained by convex-hulling the position of the line of sight is shown as CA-L.

[0064] FIG. 16 is a diagram showing an example in the case where unreliable data is excluded regarding the position of the line of sight passing through the right-eye spectacle lens in an experiment in which a subject according to the present embodiment follows an object existing on the left side of the subject with the line of sight. Specifically, the example shown in the figure is a plot diagram in the case where the line-of-sight data with a distance difference of 50 [cm] or more is deleted in the example shown in FIG. 14. In FIG. 16, the convex hull region obtained by convex-hulling the position of the line of sight is shown as CA-R.

[0065] Normally, when the line of sight follows an object outside the field of view, first the line of sight moves, and then the head moves to try to bring the object into the visible area. The spectacle lens arranges the principal meridians at the lens center position passing through the prism reference point PRP, and is designed such that the aberration becomes zero on the principal meridians. Therefore, it is considered that spectacle lens wearers tend to first move their line of sight and then move their head to try to bring the object into the visible area, especially when the line of sight follows an object outside the field of view. In the above-described first experiment and second experiment, a head rotation motion for tracking the object was also observed after the line of sight moved.

[0066] When the sphere is located on the left side of the subject, there is a tendency for both the left and right lines of sight to look using the left side of the lens. Also, in the subjects of this experiment, although the dominant eye was the left eye when the sphere was located in front of the subject, the dominant eye changed to the right eye when the sphere was located in the left front of the subject.

[0067] Here, the binocular fusion function will be explained. Fusion is the function of combining the respective images projected onto the left and right eyes into one in the brain. When the left and right lenses have different average refractive power maps and astigmatism maps, the differences that occur when these are superimposed on each other are considered to cause discomfort when the images projected onto the left and right eyes are fused.

[0068] Here, the left and right lenses having an average refractive power map and an astigmatism map will be considered.

[0069] FIG. 17 is a diagram showing the average refractive power map of the left lens according to the present embodiment.

[0070] FIG. 18 is a diagram showing the astigmatism map of the left lens according to the present embodiment.

[0071] FIG. 19 is a diagram showing the average refractive power map of the left lens according to the present embodiment.

[0072] FIG. 20 is a diagram showing the astigmatism map of the left lens according to the present embodiment.

[0073] Since the left and right lenses shown in FIGS. 17 to 20 are lenses calculated with the same prescription and the same calculation parameters, it can be seen that they are symmetrical. Let's consider the difference by superimposing the average refractive power maps and the aberration maps of the left and right lenses shown in FIGS. 17 to 20. However, it doesn't make sense to superimpose the entire range of the maps. By superimposing them within the range where the line of sight often passes in the living environment, it is possible to more accurately capture the data that makes the wearer feel uncomfortable. Also, since the range where the line of sight often passes in the living environment is used even in the design considering the dominant eye, it is conceivable to use the range where the line of sight moves obtained from the experiments as described above.

[0074] Referring to FIGS. 21 to 24, let's consider the superposition assuming the distance vision range. Here, we will try to superimpose the range within a radius of 10 [mm] centered at (x, y) = (0, 10) and the range within a radius of 10 [mm] centered at (x, y) = (0, -10) assuming the near vision range.

[0075] FIG. 21 is a diagram showing the range to be superimposed on the average refractive power map of the left lens according to the present embodiment.

[0076] FIG. 22 is a diagram showing the range to be superimposed on the aberration map of the left lens according to the present embodiment.

[0077] The actual line of sight will pass through the coordinates of one point within the ranges shown in FIGS. 21 and 22. When considering the difference that occurs when the average refractive power maps and the aberration maps of the left and right lenses are superimposed on each other, calculate the difference at the coordinates of the one point through which the actual line of sight passes. In this way, all the coordinate points within the range are scanned and calculated.

[0078] It is also conceivable to consider the movement of the line of sight for this scanning. For example, when capturing an object in the distance, usually, the left and right lines of sight move in the same direction. When capturing an object on the left, the left and right lines of sight face left, and when capturing an object on the right, the left and right lines of sight face right.

[0079] Specifically, when the coordinate point of the left lens is (x, y) = (-10, 10), it is conceivable that the coordinate point of the right lens to be compared is (x, y) = (-10, 10). Also, when capturing an object in the central direction, the left and right lines of sight are parallel. Specifically, when the coordinate point of the left lens is (x, y) = (0, 0), it is conceivable that the coordinate point of the right lens to be compared is (x, y) = (0, 0).

[0080] Also, for example, when capturing an object nearby, depending on the object, when the object such as a smartphone (smartphone) or a tablet terminal device is stationary and located in the central or lower direction, the line of sight is directed to capture the object. In this case, specifically, when the coordinate point of the left lens is (x, y) = (10, -10), it is conceivable that the coordinate point of the right lens to be compared is (x, y) = (-10, -10).

[0081] In this way, it is conceivable to simply determine the coordinate points to be compared, but the difference may also be calculated using the coordinates on the lens through which the left and right lines of sight obtained in the experiment pass.

[0082] The distance vision range here assumes capturing an object in the distance as described above. That is, the left and right lines of sight move in the same direction, and the coordinate points for simple comparison are determined. Also, for the near vision range, as described above, it is assumed that when the object is stationary nearby, the line of sight is directed to capture the object at a position below the center, and the coordinate points for simple comparison are determined.

[0083] FIG. 23 is a diagram showing the difference in the average refractive power map in the distance vision range according to the present embodiment. As is clear from the figure, it can be seen that there is no difference and it is almost 0.

[0084] FIG. 24 is a diagram showing the difference in the aberration map in the distance vision range according to the present embodiment. As is clear from the figure, it can be seen that there is no difference and it is almost 0.

[0085] FIG. 25 is a diagram showing the difference in the average refractive power map in the near vision range according to the present embodiment. As is clear from the figure, it can be seen that there is no difference and it is almost 0.

[0086] FIG. 26 is a diagram showing the difference in the aberration map in the near vision range according to the present embodiment. As is clear from the figure, it can be seen that there is no difference and it is almost 0.

[0087] Thus, when the design is bilaterally symmetric, it can be said that there is almost no left - right difference depending on the overlapping range.

[0088] Here, consider the left and right lenses of the aberration map as follows. Assume an experiment in a virtual environment assuming driving a right - hand - drive vehicle. Assume that as the line - of - sight range of the wearer of this lens, the distance vision part has a line of sight shifted to the left, and the near vision part has a line of sight shifted to the center.

[0089] FIG. 27 is a diagram showing the aberration map of the left lens according to the present embodiment.

[0090] FIG. 28 is a diagram showing the aberration map of the right lens according to the present embodiment.

[0091] In this case, the line - of - sight range to be considered in the design is the part within the black frame. To make it easier to imagine the actual design, here, the aberration map shows only the range on the frame shape.

[0092] FIG. 29 is a diagram showing the aberration map of the left lens according to the present embodiment.

[0093] FIG. 30 is a diagram showing the aberration map of the left lens according to the present embodiment.

[0094] The difference in the aberration map at this time is as shown in FIGS. 31 and 32.

[0095] FIG. 31 is a diagram showing the difference in the range of the distance vision part on the left lens according to the present embodiment.

[0096] Figure 32 is a diagram showing the difference in the range of the distance vision part on the right lens according to the present embodiment.

[0097] This result indicates that when the distance vision part is used, this difference becomes data that causes discomfort to the wearer.

[0098] Figure 33 is a diagram showing the difference in the range of the near vision part on the left lens according to the present embodiment.

[0099] Figure 34 is a diagram showing the difference in the range of the near vision part on the right lens according to the present embodiment.

[0100] Here, assuming that the dominant eye of the wearer of this lens is the right eye for the distance vision part and the left eye for the near vision part. The results of designing both the left and right lenses so as to eliminate the left - right difference in the above - mentioned aberration map and to make the aberration map of the distance vision part the right eye and the near vision part the left eye are shown in FIGS. 35 and 36.

[0101] Figure 35 is a diagram showing the aberration map of the left lens according to the present embodiment.

[0102] Figure 36 is a diagram showing the aberration map of the right lens according to the present embodiment.

[0103] The difference in the aberration map at this time is as shown in FIGS. 37 to 40.

[0104] Figure 37 is a diagram showing the difference in the range of the distance vision part on the left lens according to the present embodiment.

[0105] Figure 38 is a diagram showing the difference in the range of the distance vision part on the right lens according to the present embodiment.

[0106] Figure 39 is a diagram showing the difference in the range of the near vision part on the left lens according to the present embodiment.

[0107] FIG. 40 is a diagram showing the difference in the near vision area on the right lens according to the present embodiment.

[0108] As is clear from the figure, it can be seen that there is no left-right difference in the aberration map in both the distance vision area and the near vision area. That is, the discomfort when the images projected onto the left and right eyes are fused is reduced.

[0109] Next, with reference to FIGS. 41 to 44, the processing flow according to the present embodiment will be described.

[0110] FIG. 41 is a flowchart showing an example of a series of processes for eliminating the left-right difference in the aberration map and considering the dominant eye according to the present embodiment. Conventionally, as shown in the figure, before considering the left-right difference and the dominant eye, a design considering the prescription data and fitting parameters of the wearer has been performed. As shown in the figure, in this flow, the designs for the right lens and the left lens are performed simultaneously. The design flow for the right lens is shown from step S111 to step S116, and the design flow for the left lens is shown from step S121 to step S126. Since there is no specific difference between the design flow for the right lens and the design flow for the left lens, in the following description, as an example, only the design flow for the right lens will be described, and the description of the design flow for the left lens will be omitted.

[0111] (Step S111) First, prescription data for right lens design and fitting parameters are obtained from the subject. This acquisition process may be realized by performing a predetermined inspection process on the subject.

[0112] (Step S112) Next, a semi-finished lens is selected. The subject may select the semi-finished lens.

[0113] (Step S113) Next, a target average refractive power map and an aberration map are obtained from the prescription data.

[0114] (Step S114) Next, design the surface on the eyeball side (to approach) so as to obtain a target average refractive power map from the prescription data and the semifinished lens. Also, adjust the lens thickness.

[0115] (Step S115) Next, obtain the average refractive power map and the aberration map on the designed eyeball surface.

[0116] (Step S116) Finally, compare the obtained average refractive power map and aberration map on the eyeball surface with the target map, and determine whether the error range is within the allowable error range. If it is not within the allowable error range (i.e., Step S116; NO), return the process to Step S114 and perform the process of designing the surface on the eyeball side and adjusting the lens thickness again. Also, if it is within the allowable error range (i.e., Step S116; YES), end the process.

[0117] FIG. 42 is a flowchart showing an example of a series of processes for determining the line-of-sight range and dominant eye to be reflected in the design from the line-of-sight data obtained from the experiment according to the present embodiment. In the description made with reference to this figure, portions outside the frame range in the line-of-sight range are excluded. Actually, for the range that does not fit into the frame, by considering the line-of-sight range and dominant eye, it is to avoid the risk of unnecessarily increasing the calculation time or not approaching the target design.

[0118] (Step S210) First, obtain the line-of-sight range obtained by the experiment and the line-of-sight data of the dominant eye in that line-of-sight range.

[0119] (Step S211) Next, obtain frame data including the pupil distance (PD) and the height of the eye point (EP) of the right lens.

[0120] (Step S212) Next, exclude portions outside the frame range in the line-of-sight range.

[0121] Note that steps S221 and S222 perform the processes of steps S211 and S212 for the left lens. The processes for the left lens and the right lens can be performed in parallel. In this flow, it can also be said that the designs for the right lens and the left lens are performed simultaneously. Since there is no specific difference between the design flow for the right lens and the design flow for the left lens, the description of the design flow for the left lens is omitted.

[0122] FIG. 43 is a flowchart showing an example of a series of processes for calculating the difference between the average refractive power map and the aberration map within the line-of-sight range according to the present embodiment, reflecting the difference in the average refractive power map and the aberration map of the non-dominant eye, and generating the target average refractive power map and aberration map of the non-dominant eye.

[0123] (Step S311) First, the average refractive power map and the aberration map within the line-of-sight range of the right lens are acquired. Similarly, in step S321, the average refractive power map and the aberration map within the line-of-sight range of the left lens are acquired.

[0124] (Step S331) When the average refractive power map and the aberration map within the line-of-sight range are acquired for each of the left and right lenses, the difference between the average refractive power map and the aberration map within the line-of-sight range of the left and right lenses is calculated. Thereafter, independent processes are performed for each of the left and right lenses. Steps S312 to S314 show the process for the right lens, and steps S322 to S324 show the process for the left lens. Since the processes for each of the left and right lenses are the same, hereinafter, the process for the right lens will be described, and the description of the process for the left lens will be omitted.

[0125] (Step S312) First, it is determined whether it is the non-dominant eye within the line-of-sight range. If it is the non-dominant eye within the line-of-sight range (Step S312; YES), the process proceeds to Step S313 and the process continues. If it is not the non-dominant eye within the line-of-sight range (Step S312; NO), the process is aborted.

[0126] (Step S313) Next, a difference obtained by multiplying the difference between the mean refractive power map and the aberration map within the line-of-sight range by a coefficient is calculated.

[0127] (Step S314) Further, the difference calculated in Step S313 is added to the mean refractive power map and the aberration map of the right lens. The steps from Step S312 to Step S314 above are looped for the number of line-of-sight ranges.

[0128] According to this embodiment, it is preferable to multiply the difference by a coefficient and add it to the mean refractive power map and the aberration map. At this time, for the map formed by the addition, it should be ensured that not only within the line-of-sight range but also outside the line-of-sight range, a sudden change in curvature or the like is not generated. This is because a sudden change in curvature may generate uncomfortable aberrations or cause vibrations and distortions.

[0129] Therefore, it is considered that the above problems can be solved by setting a coefficient of 1.0 at the center of the line-of-sight range and a coefficient of 0.0 at the boundary of the line-of-sight range and using a coefficient that changes smoothly therebetween. For example, the formula for obtaining the coefficient at a coordinate point on the line connecting the center coordinate point and the boundary coordinate point of the line-of-sight range is such that when the center coordinate point of the line-of-sight range is (x c , y c ) and the boundary coordinate point of the line-of-sight range is (x e , y e ), it can be expressed by the following formula (4).

[0130]

Equation

[0131] Also, assuming that the coordinate point on the line connecting the center coordinate point and the boundary coordinate point of the line-of-sight range is (x, y), the following equation (5) can be derived.

[0132]

Equation

[0133] That is, the coefficient m at the coordinate point on the line connecting the center coordinate point and the boundary coordinate point of the line-of-sight range can be expressed by the following equation (6).

[0134]

Equation

[0135] FIG. 44 is a flowchart showing an example of a series of processes for generating a surface on the eyeball side, targeting the average refractive power map and the astigmatism map according to the present embodiment. With reference to this figure, the process of generating a surface on the eyeball side will be described, targeting the average refractive power map and the astigmatism map generated by the process with reference to FIG. 43. Note that independent processes are performed for each of the left and right lenses. Steps S411 to S415 show the process for the right lens, and steps S421 to S425 show the process for the left lens. Since the processes for each of the left and right lenses are the same, hereinafter, the process for the right lens will be described, and the description of the process for the left lens will be omitted.

[0136] (Step S411) First, for the right lens, one selectable semi-finished lens is selected. The processes after one semi-finished lens is selected are described in steps S412 and subsequent steps. Note that there may be a case where a plurality of semi-finished lenses are selected. In such a case, simultaneously with steps S412 and subsequent steps, parallel processing can be performed by the same processes as steps S412 and subsequent steps. The description of the parallel processing in the case where a plurality of semi-finished lenses are selected will be omitted.

[0137] (Step S412) Next, based on the prescription data and the semi-finished lens, the surface on the eyeball side is designed to form a target map, and the lens thickness is adjusted.

[0138] (Step S413) Next, an average refractive power map and an astigmatism map at the designed eyeball surface are obtained.

[0139] (Step S414) Next, the obtained average refractive power map and astigmatism map are compared with the target map to determine whether they are within the allowable error range. If they are within the allowable error range (i.e., Step S414; YES), the process proceeds to Step S415. If they are not within the allowable error range (i.e., Step S414; NO), the process returns to Step S412 to perform the design and adjustment process again.

[0140] (Step S415) When the design and verification for each semi-finished lens are completed, a comparison is made with the target map, and the combination of the semi-finished lens with the least allowable error, the surface on the eyeball side, and the thickness is adopted.

[0141] Next, with reference to FIGS. 45 and 46, a configuration example of an apparatus for realizing the dominant eye determination method and the spectacle lens design method as described above will be described.

[0142] FIG. 45 is a functional configuration diagram showing an example of the functional configuration of a spectacle lens design system and a dominant eye determination system according to the present embodiment. With reference to this figure, an example of the functional configuration of the spectacle lens design system 10 and the dominant eye determination system 11 will be described. The spectacle lens design system 10 designs spectacle lenses for a subject. The dominant eye determination system 11 determines the dominant eye of the subject.

[0143] The eyeglass lens design system 10 is configured to include a dominant eye determination system 11 and an eyeglass lens design unit 21. Each of these functional units is realized using, for example, an electronic circuit. Further, each functional unit may be internally provided with storage means such as a semiconductor memory or a magnetic hard disk device as necessary. Also, each function may be realized by a computer having a CPU (Central Processing Unit) and software. The dominant eye determination system 11 includes a line-of-sight vector acquisition unit 12, an object position control unit 13, a calculation unit 14, and a determination unit 15.

[0144] The line-of-sight vector acquisition unit 12 acquires a line-of-sight vector from the head-mounted display VR. The line-of-sight vector indicates the movement of the line of sight of each of the subject's two eyes in a three-dimensional space. The line-of-sight vector may indicate the line of sight refracted by the glasses worn by the subject. A subject wearing the head-mounted display VR visually recognizes an object arranged in a virtual space. The line-of-sight vector changes following the object. Note that the object may be reproduced in a virtual space and movable in a living environment.

[0145] The object position control unit 13 moves an object arranged in a virtual space. The object position control unit 13, for example, repeats the operation of moving the object three or more times in the same manner. The operation may be the operation as described with reference to FIGS. 2 to 5.

[0146] The calculation unit 14 calculates the degree to which the line-of-sight vector approaches the object based on the line-of-sight vector acquired by the line-of-sight vector acquisition unit 12 and the position of the object in the three-dimensional space controlled by the object position control unit 13. Here, although the line-of-sight vector follows the movement of the object, the object does not necessarily exist on the line-of-sight vector. The degree of approach calculated by the calculation unit 14 is calculated for each of the left and right sides. It can also be said that the eye with the closer degree of approach (the line-of-sight vector being closer to the object) among the left and right line-of-sight vectors is the dominant eye.

[0147] The determination unit 15 determines the dominant eye of the subject based on the degree to which the line-of-sight vectors of the left and right eyes of the subject approach the object. For example, the determination unit 15 may determine the eye with the line-of-sight vector that is closer to the object as the dominant eye of the subject. More specifically, when the object is moved, the determination unit 15 stores the distance when the position of the line-of-sight vector and the object in the three-dimensional space is closest for each of the left and right eyes of the subject, and may determine the one with the closer distance as the dominant eye of the subject.

[0148] Here, in order to determine more accurately, the determination unit 15 may determine the dominant eye of the subject based on the statistical calculation value (for example, the average value) of the distance between the line-of-sight vector calculated while the object repeats the same movement and the position of the object in the three-dimensional space. On the other hand, when taking the average value when the position of the line-of-sight vector and the object in the three-dimensional space is closest, as shown in FIG. 6, if the measurement period is short, the degree of approach of each of the left and right may be reversed (resulting in an incorrect determination). Therefore, the determination unit 15 can suppress making an incorrect determination by determining the dominant eye of the subject after the object repeats at least the same movement three or more sets.

[0149] The spectacle lens design unit 21 designs the spectacle lens using the convex hull region that includes the trajectory of the line-of-sight vector in the spectacle lens assumed to be worn by the subject based on the degree of approach calculated by the calculation unit 14. Note that noise may be included in the trajectory of the line-of-sight vector. Therefore, the spectacle lens design unit 21 may design the spectacle lens using the convex hull region set by deleting noise from the trajectory of the line-of-sight vector in the spectacle lens based on a predetermined condition.

[0150] The eyeglass lens design unit 21 may perform lens design based on information on whether it has been determined to be the dominant eye by the determination unit 15. More specifically, in the convex hull region, the eyeglass lens design unit 21 makes the average refractive power map or the aberration map of the eyeglass lens determined to be the non-dominant eye approach the average refractive power map or the aberration map of the eyeglass lens determined to be the dominant eye, and may design the eye lens with the average refractive power map or the aberration map as a target.

[0151] FIG. 46 is a block diagram showing an example of the internal configuration of the devices included in the spectacle lens design system 10 and the dominant eye determination system 11 according to the present embodiment. At least some of the functions of each device included in these systems can be realized using a computer. As shown in the figure, the computer includes a central processing unit 901, a RAM 902, an input / output port 903, input / output devices 904 and 905, etc., and a bus 906. The computer itself can be realized using existing technologies. The central processing unit 901 executes instructions included in the programs read from the RAM 902 and the like. The central processing unit 901 writes data to the RAM 902, reads data from the RAM 902, and performs arithmetic operations and logical operations according to each instruction. The RAM 902 stores data and programs. Each element included in the RAM 902 has an address and can be accessed using the address. Note that RAM is an abbreviation for "Random Access Memory". The input / output port 903 is a port for the central processing unit 901 to exchange data with external input / output devices and the like. The input / output devices 904 and 905 are input / output devices. The input / output devices 904 and 905 exchange data with the central processing unit 901 via the input / output port 903. The bus 906 is a common communication path used inside the computer. For example, the central processing unit 901 reads and writes data in the RAM 902 via the bus 906. Also, for example, the central processing unit 901 accesses the input / output port via the bus 906. Also, all or part of each functional unit included in these devices may be realized using hardware (for example, circuitry) such as an ASIC, a PLD, or an FPGA. Also, all or part of each functional unit may be realized by a combination of software and hardware.

[0152] [Summary of the Embodiment] According to the above-described embodiments, the dominant eye determination system 11 determines the dominant eye of a subject. By including the line-of-sight vector acquisition unit 12, the dominant eye determination system 11 acquires line-of-sight vectors indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space. By including the calculation unit 14, the dominant eye determination system 11 calculates the degree of proximity (e.g., the shortest distance) between the position of an object that can be visually recognized by the subject in the three-dimensional space and the line-of-sight vector that follows the object. By including the determination unit 15, for each of the subject's left and right eyes, based on the degree to which the line-of-sight vector approaches the object, the dominant eye determination system 11 determines the eye that is closer as the dominant eye of the subject. By adopting such a configuration, the dominant eye determination system 11 can easily determine the dominant eye of the subject.

[0153] Also, according to the above-described embodiments, the spectacle lens design system 10 designs the spectacle lenses of a subject. By including the line-of-sight vector acquisition unit 12, the spectacle lens design system 10 acquires line-of-sight vectors indicating the movement of the line of sight of each of the subject's two eyes in a three-dimensional space. By including the calculation unit 14, the spectacle lens design system 10 calculates the degree of proximity (e.g., the shortest distance) between the position of an object that can be visually recognized by the subject in the three-dimensional space and the line-of-sight vector that follows the object. By including the spectacle lens design unit 21, the spectacle lens design system 10 designs the spectacle lenses using the convex hull region that includes the trajectory of the line-of-sight vector in the spectacle lenses assumed to be worn by the subject. By adopting such a configuration, the spectacle lens design system 10 can design spectacle lenses considering the dominant eye of the subject.

[0154] Note that all or part of the functions of each unit included in the spectacle lens design system 10 and the dominant eye determination system 11 in the above-described embodiments may be realized by recording a program for realizing these functions on a computer-readable recording medium, reading the program recorded on this recording medium into a computer system, and executing it. Here, the "computer system" is assumed to include hardware such as an OS and peripheral devices.

[0155] The "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, etc., and a storage unit such as a hard disk incorporated in a computer system. Further, the "computer-readable recording medium" also includes those that dynamically hold a program for a short period of time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case. Also, the above program may be for realizing a part of the functions described above, or may be for realizing the functions described above in combination with a program already recorded in a computer system.

[0156] As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the gist of the present invention. Also, the configurations described in the above embodiments and each example may be combined.

Explanation of Reference Numerals

[0157] LS... spectacle lens, F... distance vision part, N... near vision part, P... intermediate part, EP... eye point, PRP... prism reference point, FV... distance vision reference point, NV... near vision reference point, 800... coordinate system, M... primary line of sight, VR... head-mounted display, 10... spectacle lens design system, 11... dominant eye determination system, 12... line-of-sight vector acquisition unit, 13... object position control unit, 14... calculation unit, 15... determination unit, 21…Eyeglass lens design department

Claims

1. An eye dominance determination system for determining the dominant eye of a subject, comprising: a gaze vector acquisition unit that acquires gaze vectors indicating the movement of the gaze of each of the subject's two eyes in a three-dimensional space; a calculation unit that calculates the position of an object visible to the subject in the three-dimensional space and the degree of approach of the gaze vector following the object; a determination unit that determines, for each of the subject's left and right eyes, the eye that is closer based on the degree to which the gaze vector approaches the object as the dominant eye of the subject; An eye dominance determination system comprising the above.

2. When the object is moved, the determination unit stores, for each of the subject's left and right eyes, the distance when the gaze vector and the position of the object in the three-dimensional space are closest, and determines the eye that is closer as the dominant eye of the subject. The eye dominance determination system according to Claim 1.

3. The determination unit determines the dominant eye of the subject after the object repeats at least three sets of similar movements. The eye dominance determination system according to Claim 1 or Claim 2.

4. The determination unit determines the dominant eye of the subject based on a statistical calculation value of the distance between the gaze vector calculated while the object repeats similar movements and the position of the object in the three-dimensional space. The eye dominance determination system according to Claim 3.

5. The gaze vector obtained by the gaze vector indicates the gaze refracted by glasses worn by the subject. The eye dominance determination system according to Claim 1 or Claim 2.

6. The object is reproduced in a virtual space and moved in a living environment. The eye dominance determination system according to Claim 1 or Claim 2.

7. An eye dominance determination method for determining the dominant eye of a subject, comprising: a gaze vector acquisition step of acquiring gaze vectors indicating the movement of the gaze of each of the subject's two eyes in a three-dimensional space; a calculation step of calculating the position of an object visible to the subject in the three-dimensional space and the degree of approach of the gaze vector following the object; a determination step of determining, for each of the subject's left and right eyes, the eye that is closer based on the degree to which the gaze vector approaches the object as the dominant eye of the subject; An eye dominance determination method having the above.

8. On a computer A program for determining the dominant eye of a subject, a line-of-sight vector acquisition step of acquiring a line-of-sight vector that indicates the movement of the line of sight of each of the two eyes of the subject in a three-dimensional space; a calculation step of calculating the position of an object that can be visually recognized by the subject in the three-dimensional space and the degree of approach of the line-of-sight vector that follows the object; a determination step of determining, for each of the left and right eyes of the subject, the eye that is closer as the dominant eye of the subject based on the degree to which the line-of-sight vector approaches the object; a program for executing the above.

9. An eyeglass lens design system for designing an eyeglass lens for a subject, a line-of-sight vector acquisition unit that acquires a line-of-sight vector that indicates the movement of the line of sight of each of the two eyes of the subject in a three-dimensional space; a calculation unit that calculates the position of an object that can be visually recognized by the subject in the three-dimensional space and the degree of approach of the line-of-sight vector that follows the object; an eyeglass lens design unit that designs an eyeglass lens using a convex hull region that includes the trajectory of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject; an eyeglass lens design system comprising the above.

10. The eyeglass lens design unit designs an eyeglass lens using the convex hull region that is set by removing noise from the trajectory of the line-of-sight vector in the eyeglass lens based on a predetermined condition. The eyeglass lens design system according to Claim 9.

11. The eyeglass lens design system further comprises a determination unit that determines, for each of the left and right eyes of the subject, the eye that is closer as the dominant eye of the subject based on the degree to which the line-of-sight vector approaches the object. In the convex hull region, the eyeglass lens design unit makes the average refractive power map or the aberration map of the eyeglass lens determined to be the non-dominant eye approach the average refractive power map or the aberration map of the eyeglass lens determined to be the dominant eye, and designs an intraocular lens targeting the average refractive power map or the aberration map. The eyeglass lens design system according to Claim 9 or Claim 10.

12. An eyeglass lens design method for designing an eyeglass lens for a subject, a line-of-sight vector acquisition step of acquiring a line-of-sight vector that indicates the movement of the line of sight of each of the two eyes of the subject in a three-dimensional space; a calculation step of calculating the position of an object that can be visually recognized by the subject in the three-dimensional space and the degree of approach of the line-of-sight vector that follows the object; An eyeglass lens design process for designing an eyeglass lens using a convex hull region that includes the locus of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject. An eyeglass lens design method having the above. **Claim 13** On a computer, A program for designing an eyeglass lens for a subject, A line-of-sight vector acquisition step of acquiring a line-of-sight vector that indicates the movement of the line of sight of each of the subject's two eyes in a three-dimensional space; A calculation step of calculating the position of an object that can be visually recognized by the subject in the three-dimensional space and the degree of approach of the line-of-sight vector that follows the object; An eyeglass lens design step of designing an eyeglass lens using a convex hull region that includes the locus of the line-of-sight vector in the eyeglass lens assumed to be worn by the subject. A program for causing the above to be executed.

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