A pair of optical elements for an augmented reality device

Abstract

A pair of ophthalmic lenses suitable for a wearer whose prescription for the left and right eyes differs by more than 0.25D based on astigmatism power, and the back surfaces of both ophthalmic lenses generally have the same shape.

Description

Technology Field

[0001] The present invention relates to a pair of ophthalmic lenses suitable for a wearer with different prescriptions for the left and right eyes.

[0002] In addition, the present invention relates to a computer means-implementation method for determining a pair of ophthalmic lenses suitable for a wearer, and an apparatus for determining a pair of ophthalmic lenses suitable for a wearer, comprising a processing circuit. Background Technology

[0003] It is known that a visual correction effect is provided to the user by equipping a pair of optical lenses having refractive power (degree) within an augmented / virtual reality device.

[0004] For some augmented reality devices, the reference rear surface of the optical lens must not vary according to the prescription. Additionally, the rear surface may need to be positioned at a precise distance from the eye. Therefore, the vertex position of the reference rear surface must be adjusted relative to the corneal center or the center of ocular rotation. Furthermore, regardless of the wearer's prescription, it is necessary to fix the distance between the vertex of the reference rear surface and the corneal center.

[0005] The position of the rear surface of the lens is determined using a known solution, such as adjusting the rear surface of the optical lens to the wearer's prescription.

[0006] For example, when the front surface of the optical lens is fixed, the distance between the cornea of ​​the eye and the back surface of the optical lens, or the distance between the center of rotation of the eyeball and the back surface of the optical lens, depends on the refractive power (degree) of the lens, the front surface curvature, and the thickness of the lens.

[0007] When the back side of the lens is fixed, the distance between the eye and the lens is generally further for negative (-) power lenses and closer for positive (+) power lenses.

[0008] Therefore, the user's field of vision may vary depending on the wearer's ametropia. The field of vision is determined by the lens diameter and lens proximity. Thus, the key is to provide optical lenses suitable for augmented reality devices.

[0009] There is another problem with negative power lenses. Standard negative power lenses have a convex front surface with low curvature and a concave back surface that provides most of the refractive power. When the front side of this lens is fixed, the thickness of the edge of the back surface of the negative power lens is not negligible and can interfere with the wearer's eyelashes. This restricts the wearer's field of vision because the refractive lens cannot be placed very close to the wearer's eye. The problem to be solved

[0010] The present invention aims to solve the aforementioned problems by providing a pair of ophthalmic lenses that can correct the wearer's refractive power, have excellent optical quality, have almost no optical aberrations, and simultaneously provide a wide field of view for a wide variety of wearer refractive powers. means of solving the problem

[0011] To this end, the present invention provides a pair of ophthalmic lenses suitable for a wearer whose prescription for the left and right eyes differs by more than 0.25D based on astigmatism power, and the rear surfaces of both ophthalmic lenses generally have the same shape.

[0012] Advantageously, a pair of ophthalmic lenses are positioned in a manner that facilitates lens position fixation within an augmented / virtual reality device while taking into account the required eye-lens distance. The eye-lens distance can be defined as the distance between the vertex of the posterior surface of the ophthalmic lens and the center of the cornea, or the distance between the vertex of the posterior surface of the ophthalmic lens and the center of rotation of the eyeball.

[0013] Another advantage is that it improves the wearer's vision correction by providing different vision correction functions, while each lens of a pair of ophthalmic lenses has generally the same back surface and low level of aberrations.

[0014] In the case of augmented reality devices, ophthalmic lenses are embedded within the device. People's perception of lens design surrounding augmented reality devices is not altered by the fact that the front and / or back surfaces of ophthalmic lenses are custom-made to provide the necessary dioptric function. This dioptric function corresponds to the power of the optical lens (average power, astigmatism, etc.) based on the direction of gaze.

[0015] By ensuring that the two lenses constituting a pair of ophthalmic lenses have similar posterior surfaces, a constant distance can be maintained between the apex of the ophthalmic lens posterior surface and the center of the cornea, or between the apex of the ophthalmic lens posterior surface and the center of eye rotation. By determining the position of the ophthalmic lens posterior surface in consideration of the cornea and / or anchor points, the risk of the device interfering with eyelashes, eyebrows, or cheeks when brought close to the eye is limited. In this way, the size of the augmented reality device can be further miniaturized.

[0016] In addition, by making the back surface of the ophthalmic lens into an appropriate geometric shape, the bounding box occupied by the ophthalmic lens for various prescriptions can be minimized.

[0017] According to additional embodiments that may be considered alone or in combination,

[0018] - The back surface of each ophthalmic lens has generally the same shape across a wide range of prescriptions;

[0019] - Bilateral ophthalmic lenses have a surface surface in which the absolute difference in surface mean spherical power and the absolute difference in surface cylindrical power at a predetermined reference point is 0.1D or less;

[0020] - Bilateral ophthalmic lenses have a surface surface in which the absolute difference in the average surface spherical power and the absolute difference in the surface circumferential power at any point on a predetermined reference area is 0.1D or less, preferably 0.05D or less;

[0021] - Each lens of a pair of ophthalmic lenses may have a flat, convex, or concave back surface and / or;

[0022] - Bilateral ophthalmic lenses have a flat back surface in which the absolute value of the surface mean spherical power and the absolute value of the surface circumferential power at any point are 0.25D or less;

[0023] - Bilateral ophthalmic lenses have a convex back surface with a surface mean spherical degree of +0.25D or greater at any point;

[0024] - Bilateral ophthalmic lenses have a concave back surface with a surface mean spherical degree of -0.25D or less at any point;

[0025] - The above pair of ophthalmic lenses is configured to be mounted on a head-mounted display (HMD) device to provide vision correction to the wearer and / or;

[0026] - Specific wearing conditions are determined according to the arrangement of the head-mounted display device to which the above pair of ophthalmic lenses are applied;

[0027] - Each ophthalmic lens meets optical performance criteria related to visual impairment and / or refractive error and / or residual astigmatism error across the domain of gaze directions or lens area, and / or;

[0028] - Each ophthalmic lens is a monofocal ophthalmic lens and / or;

[0029] - Each monofocal ophthalmic lens has an absolute value of refractive error and a residual astigmatism error of 0.5D or less, preferably 0.25D or less, for viewing directions within 30 degrees from the primary gaze, and / or;

[0030] - Each ophthalmic lens has a specific front surface, such as an aspherical front surface, which is a non-spherical shape.

[0031] The present invention also relates to a computer means-implemented method for determining a pair of ophthalmic lenses suitable for a wearer, wherein the method comprises:

[0032] - A step of providing prescription data representing the wearer's prescription, and

[0033] - A step of providing wearing condition data indicating predetermined wearing conditions, and

[0034] - A step of providing rear data representing the shape of the rear, and

[0035] - A step of determining a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0036] Includes

[0037] According to various embodiments, the computer means-implementation method is configured to determine a pair of ophthalmic lenses suitable for a wearer, wherein the pair of ophthalmic lenses is suitable for a wearer whose prescription for the left eye and the right eye differs by 0.25D or more based on the astigmatism power, and the rear surfaces of both ophthalmic lenses generally have the same shape.

[0038] Advantageously, a pair of ophthalmic lenses is determined in a way that facilitates lens position fixation within an augmented / virtual reality device while taking into account the required eye-lens distance.

[0039] Another advantage is that the wearer's vision correction is improved by having each lens of the pair of ophthalmic lenses possess a low level of aberration while providing different vision correction functions. By having the pair of ophthalmic lenses have similar posterior surfaces, a constant distance can be maintained between the apex of the posterior surface of the ophthalmic lens and the center of the cornea, or between the apex of the posterior surface of the ophthalmic lens and the center of eye rotation. By determining the position of the posterior surface of the ophthalmic lens in consideration of the cornea and / or anchor points, the risk of the device interfering with eyelashes, eyebrows, or cheeks when brought close to the eye is limited. In this way, the size of the augmented reality device can be further miniaturized.

[0040] The present invention also relates to a device for determining a pair of ophthalmic lenses suitable for a wearer, wherein the device comprises:

[0041] - Configured to receive prescription data indicating the wearer's prescription,

[0042] - Configured to receive wearing condition data indicating predetermined wearing conditions,

[0043] - Configured to receive rear data representing the shape of the rear, and

[0044] - Includes a processing circuit configured to determine a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0045] According to various embodiments, the device is configured to determine a pair of ophthalmic lenses suitable for a wearer, wherein the pair of ophthalmic lenses is suitable for a wearer whose prescription for the left and right eyes differs by more than 0.25D based on astigmatism power, and the back surfaces of both ophthalmic lenses generally have the same shape.

[0046] Advantageously, the above pair of ophthalmic lenses is manufactured in a manner that facilitates the fixation of lens positions within an augmented / virtual reality device.

[0047] Advantageously, the above pair of ophthalmic lenses consists of a lens configured to be positioned in front of the wearer's left eye and a lens configured to be positioned in front of the wearer's right eye.

[0048] According to additional embodiments, the present invention relates to a pair of ophthalmic lenses suitable for a wearer, wherein each ophthalmic lens has a different vision correction function under certain wearing conditions, and the rear surfaces of both ophthalmic lenses generally have the same shape.

[0049] Advantageously, the pair of ophthalmic lenses is manufactured in such a way that the left lens and the right lens differ from each other in at least one aspect of vision correction function, and the rear surfaces of both ophthalmic lenses have generally the same shape. The front surface of the ophthalmic lens is produced through an optimization process to meet optical performance targets and processed by a surface generator.

[0050] According to additional embodiments that may be considered alone or in combination,

[0051] - Each ophthalmic lens has the same refractive index and / or;

[0052] - The vision correction function of bilateral ophthalmic lenses has a difference in refractive power of 0.25D or more and / or an astigmatism power difference of 0.25D or more at a specified reference point;

[0053] - Bilateral ophthalmic lenses have a surface surface in which the absolute difference in the average spherical power and the absolute difference in the circumferential power at a specified reference point is 0.1D or less;

[0054] - Bilateral ophthalmic lenses have posterior surfaces in which the absolute difference in mean spherical power is 0.1D or less in a specified reference area, or;

[0055] - Bilateral ophthalmic lenses have a flat back surface in which the absolute value of the surface mean spherical power and the absolute value of the surface circumferential power at any point are 0.25D or less;

[0056] - Bilateral ophthalmic lenses have a convex back surface with a surface mean spherical degree of +0.25D or greater at any point;

[0057] - Bilateral ophthalmic lenses have a concave back surface with a surface mean spherical degree of -0.25D or less at any point;

[0058] - The above pair of ophthalmic lenses is configured to be mounted on a head-mounted display (HMD) device to provide vision correction to the wearer and / or;

[0059] - Specific wearing conditions are determined according to the arrangement of the head-mounted display device to which the above pair of ophthalmic lenses are applied;

[0060] - Each ophthalmic lens meets optical performance standards related to visual impairment and / or refractive error and / or residual astigmatism error across the line of sight area or lens area, and / or;

[0061] - Each ophthalmic lens is a monofocal ophthalmic lens and / or;

[0062] - Each monofocal ophthalmic lens has a refractive error and residual astigmatism error of 0.5D or less, preferably 0.25D or less, for viewing directions within 30 degrees from the first line of sight, and / or;

[0063] - Each ophthalmic lens has a specific front surface, such as an aspherical front surface, which is a non-spherical shape.

[0064] The present invention also relates to a computer means-implemented method for determining a pair of ophthalmic lenses suitable for a wearer, wherein the method comprises:

[0065] - A step of providing prescription data representing the wearer's prescription, and

[0066] - A step of providing wearing condition data indicating predetermined wearing conditions, and

[0067] - A step of providing rear data representing the shape of the rear, and

[0068] - A step of determining a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0069] Includes

[0070] The present invention also relates to a device for determining a pair of ophthalmic lenses suitable for a wearer, wherein the device comprises:

[0071] - Configured to receive prescription data indicating the wearer's prescription,

[0072] - Configured to receive wearing condition data indicating predetermined wearing conditions,

[0073] - Configured to receive rear data representing the shape of the rear, and

[0074] - Includes a processing circuit configured to determine a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0075] The present invention also relates to a computer program product that stores one or more instruction sequences that can access a processor and, when executed by the processor, cause the processor to perform the steps of the method according to the present invention.

[0076] The present invention also relates to a computer-readable storage medium having a program recorded thereon that enables a computer to execute the method of the present invention.

[0077] As is evident from the following description, unless otherwise specifically stated, descriptions throughout the specification utilizing terms such as "computing" and "calculating" should be understood as referring to the operation and / or process of a computer or computational processing system, or a similar electronic computational processing device, of manipulating and / or converting data represented as a physical quantity within the registers and / or memory of the computational processing system into other data similarly represented as a physical (e.g., electronic) quantity within the memory, registers, or other information storage, transmission, or display devices of the computational processing system.

[0078] Embodiments of the present invention may include a device for performing the operations described herein. The device may include a general-purpose computer or a digital signal processor (“DSP”) that may be specifically configured for a desired use or selectively activated or reconfigured by a computer program stored in the computer. Such computer programs may be stored on a computer-readable storage medium, examples of which include, but are not limited to, any type of disk including a floppy disk, an optical disk, a CD-ROM, a magnetic-optical disk, ROM (read-only memory), RAM (Random Access Memory), an electrically programmable read-only memory (EPROM), an electrically eraseable read-only memory (EEPROM), a magnetic or optical card, or other types of media suitable for storing electronic instructions and capable of being coupled to a computer system bus.

[0079] The processes presented herein are not inherently related to any specific computer or other device. It may be found convenient to use various general-purpose systems with programs according to the teachings of this specification, or to configure more specialized devices to perform the desired method. A structure preferred for such various systems is provided in the following description. Furthermore, embodiments of the present invention have not been described in relation to any specific programming language. It will be understood that various programming languages ​​may be used to implement the teachings of the present invention as described herein. Effects of the invention

[0080] Included in the contents of the present invention. Brief explanation of the drawing

[0081] Now, embodiments of the present invention will be described merely by way of example with reference to the following drawings. FIGS. 1a and FIGS. 1b show cross-sectional views of an ophthalmic lens according to the prior art. FIGS. 2A and FIGS. 2B show cross-sectional views of an ophthalmic lens according to the present invention. FIGS. 3a to 6b show maps of refractive power and astigmatism before and after optimization of various embodiments of ophthalmic lenses belonging to a pair of lenses according to the present invention. FIGS. 7a to 12c show maps regarding the refractive power, astigmatism, and vertical cross-section before and after optimization of various embodiments of an ophthalmic lens according to the present invention. Specific details for implementing the invention

[0082] The components of the drawings are illustrative for brevity and clarity and are not necessarily depicted in proportion to their actual dimensions. For example, some of the components of the drawings are exaggerated compared to others to aid in understanding the embodiments of the invention.

[0083] In the remainder of this specification, "upper," "lower," "front," "rear," or other terms indicating relative positions may be used. It should be understood that these terms apply when a device comprising a pair of ophthalmic lenses is worn.

[0084] FIGS. 1a and 1b show cross-sectional views of an ophthalmic lens (100) and a user's eye (200). The ophthalmic lens (100) has a front surface (102) and a rear surface (104). The ophthalmic lens (100) of an augmented reality device is manufactured in a manner similar to an ophthalmic lens of eyeglasses, but the rear surface (104) is processed to provide a vision correction function to the wearer. The front surface (102) and the rear surface (104) are connected to each other by an edge (110).

[0085] An ophthalmic lens (100) can be mounted within an augmented reality device (not shown) and can be fixed within the augmented reality device thanks to a fixing means (106). The front surface (102) of the ophthalmic lens provides an upper portion (102a) and a lower portion (102b) configured to accommodate the fixing means (106).

[0086] In the illustrated eye (200), there is an ocular rotation center (202) and a corneal center (204).

[0087] According to FIG. 1a, the illustrated ophthalmic lens (100) provides the wearer with a negative (-) refractive power. The ophthalmic lens (100) consists of a generally slightly convex front surface (102) and a generally concave rear surface (104).

[0088] According to FIG. 1b, the illustrated ophthalmic lens (100) provides a positive (+) refractive power to the wearer. The ophthalmic lens (100) consists of a generally convex front surface (102) and a slightly concave rear surface (104).

[0089] For proper use of the ophthalmic lens, the center of rotation of the eyeball (200) or the center of the cornea (204) of the wearer's eye (200) needs to be positioned apart from the back surface (104) of the ophthalmic lens by a predetermined eye-lens distance (108).

[0090] Meanwhile, the distance between the eye and the lens depends on the refractive power of the ophthalmic lens, the curvature of the front surface (102), and the thickness of the ophthalmic lens (100). The distance between the eye and the lens (108) is greater in the case of an ophthalmic lens (100) that provides negative (-) refractive power than in the case of an ophthalmic lens (100) that provides positive (+) refractive power.

[0091] The wearer's field of vision (112) varies depending on the size of the ophthalmic lens or the size of the aperture of the augmented reality device, the prescription, and the distance between the eye and the lens. Therefore, the field of vision (112) may vary from person to person depending on the wearer's non-presbyopia.

[0092] Additionally, as shown in FIG. 1a, an ophthalmic lens (100) having negative (-) refractive power provides a generally concave rear surface (104). When the ophthalmic lens (100) is secured by a fixing means (106) on the front surface (102), the thickness of the edge (110) is not negligible and may get in the way of the wearer's eyelashes, eyebrows, or cheeks.

[0093] In the case of an ophthalmic lens (100) included in an augmented reality device, the processed back surface (104) that provides most of the refractive power is fixed by a fixing means (106) provided on the front surface (102), so that the ophthalmic lens (100) is very close to the wearer's eye (200), thereby preventing the phenomenon of restricting the wearer's field of vision (112).

[0094] FIGS. 2a and 2b show cross-sectional views of an ophthalmic lens (300) and a wearer's eye (200) according to the present invention, which can solve problems associated with a pair of ophthalmic lenses according to the prior art.

[0095] According to the present invention, a pair of ophthalmic lenses (300) comprises a first lens, which may be called a "left lens," configured to be placed in front of the wearer's left eye, and a second lens, which may be called a "right lens," configured to be placed in front of the wearer's right eye. The left lens and the right lens are adjusted to fit the wearer, and the left lens is made according to a prescription for the left eye, and the right lens is made according to a prescription for the right eye.

[0096] Each lens of a pair of ophthalmic lenses (300) has a rear surface (304) of generally the same shape. The difference in prescription between the two lenses constituting the pair of ophthalmic lenses (300) is 0.25D or more based on the astigmatism power.

[0097] Each lens of a pair of ophthalmic lenses (300) also includes a front surface (302) that determines the wearer's prescription.

[0098] A wearer's prescription should be understood as a set of optical characteristics, including refractive power, astigmatism, and, where applicable, add power, measured by an ophthalmologist to place a lens in front of the individual's eyes to correct that individual's vision defect, for example. Generally speaking, a prescription for progressive add power lenses includes a refractive power value, an astigmatism value at the hyperopia point, and an add power value.

[0099] The term "generally identical shape" means that the shape of the rear surface (304) of both lenses constituting a pair of ophthalmic lenses (300) is identical in the main part of the rear surface (304). As a pair of ophthalmic lenses (300) is provided for the left eye (200) and the right eye (200), there are some symmetrical geometric features.

[0100] The posterior surface of the lens facing the wearer's left eye and the posterior surface of the lens facing the wearer's right eye each include a meridian that defines one nasal portion and the other temporal portion of the meridian.

[0101] An additional definition of the term "generally identical shape" is that the lenses facing the wearer's left and right eyes are symmetrical with respect to the meridians.

[0102] The nasal portion of the lens facing the wearer's left eye and the nasal portion of the lens facing the wearer's right eye are nearly symmetric with respect to the meridian of the lens facing the wearer's left eye, and are symmetric over at least 50%, preferably over at least 80%, of the nasal portion of the lens facing the wearer's right eye.

[0103] The temporal portion of the lens facing the wearer's left eye and the temporal portion of the lens facing the wearer's right eye are nearly symmetric with respect to the meridian of the lens facing the wearer's left eye, and are symmetric over at least 50%, preferably over at least 80%, of the temporal portion of the lens facing the wearer's right eye.

[0104] The nasal portion of the lens facing the wearer's right eye and the nasal portion of the lens facing the wearer's left eye are nearly symmetric with respect to the meridian of the lens facing the wearer's right eye, and are symmetric over at least 50%, preferably over at least 80%, of the nasal portion of the lens facing the wearer's left eye.

[0105] The temporal portion of the lens facing the wearer's right eye and the temporal portion of the lens facing the wearer's left eye are nearly symmetric with respect to the meridian of the lens facing the wearer's right eye, and are symmetric over at least 50%, preferably over at least 80%, of the temporal portion of the lens facing the wearer's left eye.

[0106] A major portion of the rear surface (304) of a pair of ophthalmic lenses (300) corresponds to 40% of the rear surface of the ophthalmic lens, preferably exceeding 50%, more preferably exceeding 60%, and even more preferably exceeding 70%.

[0107] In a manner similar to a known ophthalmic lens (100) that corrects the wearer's refractive power by processing the rear surface (104), the front surface (302) of the ophthalmic lens (300) can be processed to obtain the same result with satisfactory optical quality (e.g., almost no optical aberrations).

[0108] By ensuring that the two lenses constituting a pair of ophthalmic lenses have similar posterior surfaces, a constant distance can be maintained between the apex of the ophthalmic lens posterior surface and the center of the cornea, or between the apex of the ophthalmic lens posterior surface and the center of eye rotation. By determining the position of the ophthalmic lens posterior surface in consideration of the cornea and / or anchor points, the risk of the device interfering with eyelashes, eyebrows, or cheeks when brought close to the eye is limited. In this way, the size of the augmented reality device can be further miniaturized.

[0109] In a wide range of prescriptions, the back surface (304) is defined as having no relation to refractive power. Here, "wide range" may be defined as a prescription range included in -5D to 5D.

[0110] In a specific embodiment, the rear surface (304) of each lens of a pair of ophthalmic lenses (300) is made of a generally identical rear surface (304) with a refractive power range of at least -3D to +3D.

[0111] Since the rear surface (304) of each lens of a pair of ophthalmic lenses (300) is subject to geometric shape constraints, the front surface (302) of each lens is configured to ensure the wearer's vision correction, while ensuring that it can be properly aligned within the same plane after being fixed to a head-mounted display (HMD).

[0112] In a specific embodiment, the rear surface (304) of a pair of ophthalmic lenses (300) has an absolute difference in the surface average spherical degree and an absolute difference in the surface circumferential degree at a predetermined reference point of 0.1D or less.

[0113] As is known, the minimum radius of curvature (R1) and the maximum radius of curvature (R2) can be calculated at any point on the surface. The radii of curvature (R1, R2) can be positive or negative. If the center of a sphere with a radius of curvature (R1 or R2) tangent to a point on the surface is located in the direction of the eye relative to the surface, R1 or R2 is positive. If the center of a sphere with a radius of curvature (R1 or R2) tangent to a point on the surface is located in the direction opposite to the eye relative to the surface, R1 or R2 is negative.

[0114] When the surface is locally spherical, it can be seen that the local minimum radius of curvature (R1) and the local maximum radius of curvature (R2) are the same. When the surface is aspherical, the local minimum radius of curvature (R1) and the local maximum radius of curvature (R2) are different.

[0115] From the local radii of curvature (R1 and R2) at a point on the surface, the spherical degrees of the local surface (denoted as SPH1 and SPH2) can be derived.

[0116] If the surface in question is the object-facing surface (also referred to as the front surface), the equation is as follows:

[0117]

[0118] In the formula, n is the index of the lens composition material, R1 and R2 are expressed in meters, and SPH1 and SPH2 are expressed in diopters.

[0119] If the surface in question is the ocular surface (also referred to as the posterior surface), the equation is as follows:

[0120]

[0121] In the formula, n is the index of the lens composition material, R1 and R2 are expressed in meters, and SPH1 and SPH2 are expressed in diopters.

[0122] As is widely known, the average spherical degree (SPH) at any point on an aspherical surface mean ) can be defined by the following formula:

[0123] S 평균 = ½ * (SPH1+SPH2).

[0124] The surface astigmatism power (CYL) is also defined by the following formula:

[0125] CYL = |SPH1 - SPH2|.

[0126] Any aspherical characteristic of a pair of lenses can be expressed in terms of the local mean sphericality and astigmatism power.

[0127] If there is a marking on the lens, the reference point may be the hyperopia point, myopia point, fitting cross (crosshairs), or prism reference point, and if there is no marking on the lens, the reference point may be the optical center or prism reference point.

[0128] In a specific embodiment, for the rear surface (304) of each lens of a pair of ophthalmic lenses (300), for example, the absolute difference in the surface average spherical degree and the absolute difference in the surface circumferential degree at any point on a predetermined reference area is 0.1D or less, preferably 0.05D or less, and the area of ​​the ophthalmic lenses (300) may be determined by the frame shape of a head-mounted display device (for example, an augmented / virtual reality device configured to accommodate the pair of ophthalmic lenses).

[0129] The “reference area” may be defined as the interior of a disk having a diameter greater than 5 mm and less than 10 mm centered on the reference point. The reference point may be a prism reference point, a fitting cross, a myopic or hyperopic point (if a micro-piece is etched in the lens), or an optical center (in the case of a non-etched single-focus lens).

[0130] In a specific embodiment, both lenses of a pair of ophthalmic lenses (300) may have a flat back surface in which the absolute value of the surface average spherical degree and the absolute value of the surface circumferential degree at any point are 0.25D or less.

[0131] According to various embodiments, both lenses of a pair of ophthalmic lenses (300) may have a non-flat back surface (304) with a surface average spherical degree of +0.25D or greater at any point.

[0132] In a specific embodiment, both lenses of a pair of ophthalmic lenses (300) may have a convex back surface (304) with a surface average spherical degree of +0.25D or greater at any point.

[0133] In another specific embodiment, both lenses of a pair of ophthalmic lenses (300) may have a concave back surface (304) having a surface average spherical degree of -0.25D or less at any point.

[0134] In relation to this embodiment, the back surface (304) of the ophthalmic lens (300) in various formulations is considered to be the same. In this way, a set of ophthalmic lenses can be obtained, and said set includes two or more different ophthalmic lenses. Taking into account that one ophthalmic lens is used for the left eye and one ophthalmic lens is used for the right eye, a pair of ophthalmic lenses (300) can be formed by arbitrarily combining the lenses according to said set.

[0135] In a specific embodiment, a pair of ophthalmic lenses (300) are mounted on a head-mounted display device and configured to provide vision correction to the wearer.

[0136] In a specific embodiment, specific wearing conditions are determined according to the arrangement of the head-mounted display device to which the pair of ophthalmic lenses are applied.

[0137] Examples of wearing conditions may include the pantoscopic angle, wrap angle, and the eye-lens distance (308) between the apex of the rear surface (304) of the ophthalmic lens (300) and the center of the cornea (204).

[0138] The foreground angle is the angle in the vertical plane between the optical axis of the ophthalmic lens (300) and the visual axis of the first eye in the primary position, and is generally measured horizontally when the wearer looks straight ahead.

[0139] The facial angle is the angle in the horizontal plane between the optical axis of the ophthalmic lens (300) and the visual axis in the first eye position, and is generally measured horizontally.

[0140] The eye-lens distance (308) is the distance between the apex (310) of the rear surface (304) of the ophthalmic lens (300) and the apex of the cornea, and is typically measured horizontally along the visual axis in the first eye position. Thus, the eye-lens distance (308) is measured taking into account the apex of the cornea, which is the corneal center (204), or the center of rotation of the eyeball (202).

[0141] The curvature of the back surface of each lens of a pair of ophthalmic lenses (300) may not be zero, which allows the two ophthalmic lenses (300) to perform different corrective functions without causing aberrations by providing the same eye-lens distance (308).

[0142] The rear portion (304) has an upper portion (304a) and a lower portion (304b) configured to accommodate a fixing means (306). By using the fixing means (306), an ophthalmic lens can be mounted on a head-mounted display device.

[0143] A head-mounted display device can be an augmented reality device.

[0144] The ophthalmic lens (300) is fixed by a fixing means (306) on the rear surface (304) so ​​that at the apex (310), the rear surface (304) of the ophthalmic lens is positioned at an exact eye-lens distance (308) from the center of rotation of the eyeball (202) or the center of the cornea (204).

[0145] More generally, for various directions of gaze, it may be desirable to have the eye-lens distance between the rear surface (304) of the ophthalmic lens and the center of rotation of the eyeball (202), or the eye-lens distance between the rear surface (304) of the ophthalmic lens and the center of the cornea (204), correspond to a specific distance that defines the rear surface (304) area at an accurate position from the wearer's eye (200).

[0146] The positioning of the rear surface (304) and the geometric shape of each lens of a pair of ophthalmic lenses (300) may be constrained by this eye-lens distance (308).

[0147] The rear surface (304) of the ophthalmic lens (300) includes a plurality of fixing points (312) located at its upper portion (304a) and lower portion (304b), and each fixing point (312) is configured to accommodate a fixing means (306).

[0148] Preferably, the rear surface (304) includes three or more fixed points (312) to ensure the unique positioning of the ophthalmic lens (300) within the frame of the augmented reality device and / or to ensure accurate distance maintenance between the eye (200) and the rear surface (304) of the ophthalmic lens for various viewing angles.

[0149] After the rear surface (304) of the lens is placed in position, the front surface (302) needs to be optimized to ensure vision correction for the wearer. The optimization process is similar to a general process, except that the surface to be optimized is the front surface rather than the rear surface.

[0150] The ophthalmic lens (300) according to the present invention corrects the wearer's refractive power with satisfactory optical quality (e.g., almost no optical aberrations), and at the same time, regardless of the wearer's refractive power, provides a wide field of view (shown in FIG. 3) thanks to the fixing means (306) being placed on the rear surface (304) of the ophthalmic lens (300).

[0151] In a specific embodiment, each lens of a pair of ophthalmic lenses (300) meets some optical performance criteria related to visual impairment and / or refractive error and / or residual astigmatism error across a region of the line of sight or lens area.

[0152] "Residual astigmatism" is defined as the difference between the astigmatism prescribed to the wearer and the astigmatism produced by the lens.

[0153] In this document, the “region of gaze direction” is defined as a plurality of gaze directions that can be represented as a cone having an eye rotation center or any other shape as a vertex. All gaze directions block the rear surface (304) of the ophthalmic lens (300).

[0154] In a specific embodiment, each ophthalmic lens (300) is a single-focus ophthalmic lens.

[0155] In a more specific embodiment, each single-focus ophthalmic lens constituting a pair of ophthalmic lenses has an absolute value of refractive error and a residual astigmatism error of 0.5D or less, preferably 0.25D or less, for directions of sight within 30 degrees from a first line of sight.

[0156] By reducing the refractive error and residual astigmatism in the line of sight area forming a cone of 30 degrees from the first line of sight, satisfactory optical quality (e.g., almost no optical aberrations) is made possible within the wearer's main line of sight area.

[0157] In other specific embodiments, the ophthalmic lens may be a bifocal lens, a trifocal lens, or a progressive lens.

[0158] In a specific embodiment, each ophthalmic lens (300) has a specific front surface, such as a non-spherical front surface, e.g., an aspherical front surface (302).

[0159] In a manner similar to a known ophthalmic lens (100) that corrects the wearer's refractive power by processing the rear surface (104), the front surface (302) of the ophthalmic lens (300) can be processed to obtain the same result with satisfactory optical quality.

[0160] The fact that the front surface (302) is processed to provide most of the refractive power and optical function of the ophthalmic lens (300) means that the front surface (302) of the ophthalmic lens (300) can have various shapes, and accordingly, the surface may be non-spherical or aspherical.

[0161] The present invention also relates to a computer means-implemented method for determining a pair of ophthalmic lenses suitable for a wearer, wherein the method comprises:

[0162] - A step of providing prescription data representing the wearer's prescription, and

[0163] - A step of providing wearing condition data indicating predetermined wearing conditions, and

[0164] - A step of providing rear data representing the shape of the rear, and

[0165] - A step of determining a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0166] Includes

[0167] By providing a prescription and specific wearing conditions according to the wearer, the constraints related to the wearer can be taken into account when designing a pair of ophthalmic lenses (300).

[0168] Since the rear surface (304) of each lens of a pair of ophthalmic lenses (300) is also constrained, when the ophthalmic lenses (300) are fixed by the fixing means (306) of the augmented reality device, the rear vertex (310) of the ophthalmic lenses is positioned at a specific eye-lens distance (308) from the wearer's eyeball rotation center (202) or corneal center, regardless of the wearer's prescription.

[0169] As the rear surface (304) of each lens of a pair of ophthalmic lenses (300) is constrained, the front surface (302) of each lens constituting the pair of ophthalmic lenses (300) is processed to provide a vision correction function to the wearer according to the provided prescription and wearing conditions.

[0170] The present invention also relates to an apparatus comprising a processing circuit configured to store one or more instruction sequences and to perform at least one of the steps of the method according to the present invention. The apparatus comprises

[0171] - A step of receiving prescription data representing the wearer's prescription, and

[0172] - A step of receiving wearing condition data indicating predetermined wearing conditions, and

[0173] - A step of receiving back data representing the shape of the back, and

[0174] - A step of determining a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0175] It is configured to determine a pair of ophthalmic lenses suitable for the wearer by executing [this].

[0176] The above method is implemented by a device including a processing circuit, such as a computer or a microcontroller.

[0177] The present invention can also access a processor and, when executed by a processor, cause the processor to perform the steps of the following method, namely,

[0178] - A step of providing prescription data representing the wearer's prescription, and

[0179] - A step of providing wearing condition data indicating predetermined wearing conditions, and

[0180] - A step of providing rear data representing the shape of the rear, and

[0181] - A step of determining a pair of ophthalmic lenses having a rear surface according to the above rear surface data and a front surface configured to provide a vision correction function according to a provided prescription under the above predetermined wearing conditions.

[0182] It relates to a computer program product that stores one or more instruction sequences that cause to perform.

[0183] The present invention also relates to a computer-readable storage medium having a program recorded thereon that enables a computer to execute the method of the present invention.

[0184] The acquisition of a pair of ophthalmic lenses (300) according to the present invention and the positioning of the ophthalmic lenses within an augmented reality device will be explained in detail later.

[0185] Instead of optimizing the rear surface (304) of each ophthalmic lens based on the front surface (302) of each ophthalmic lens, the front surface (302) is optimized based on the rear surface (304) to match optical performance, for example, the wearer's prescription, and optionally to an optical performance target that takes into account the wearing conditions. The final pair of ophthalmic lenses (300) can be obtained from lens targets such as Best Form lenses or Tscherning lenses.

[0186] It is also conceivable that a pair of ophthalmic lenses according to the present invention be composed of a first ophthalmic lens and a second ophthalmic lens. When such a pair of ophthalmic lenses is mounted on an augmented / virtual reality device, the first ophthalmic lens is configured to face the left eye of the wearer wearing the augmented / virtual reality device, and the second ophthalmic lens is configured to face the right eye of the wearer.

[0187] Following the positioning of the first and second ophthalmic lenses of a pair of ophthalmic lenses with respect to the frame of an augmented / virtual reality device, a number of parameters, namely,

[0188] - The rear surface of each of the first and second ophthalmic lenses to be determined, and the positioning of each of the first and second ophthalmic lenses which may vary depending on the wearing conditions within the first eye standard and the second eye standard,

[0189] - Refractive indices of the first and second ophthalmic lenses,

[0190] - A wearer prescription for the left and right eyes, ultimately including the add power,

[0191] - The contour or shape of the above pair of first and second ophthalmic lenses, and

[0192] - Constraints such as minimum center, and / or edge thickness of first and second ophthalmic lenses, and prism thinning for progressive add lenses.

[0193] The first and second ophthalmic lenses can be determined based on this.

[0194] Using these inputs, a spherical or torical front surface can be calculated, and accordingly, a desirable prescription at the reference point is provided by the front surface curvature. If each lens of the pair of ophthalmic lenses has a marking, the reference point may be the hyperopic or myopic point. If there is no marking on the lens, the reference point may be the optical center.

[0195] Estimates of this curvature can be obtained using the Gullstrand formula.

[0196] To minimize the difference between the target optical performance and the optical performance of the pair of ophthalmic lenses, the front surfaces of the first and second ophthalmic lenses can be individually modified or adjusted through an optimization process.

[0197] Optimization can be performed through an iterative process using a merit function that represents the differences in one or more optical references (e.g., the wearer's refractive power and / or astigmatism) for a line of sight area defined by a cone having a predetermined angle.

[0198] In this optimization process, mounting parameters for positioning the rear surfaces of the first and second ophthalmic lenses for an augmented / virtual reality device may be considered.

[0199] The front surfaces of the first and second ophthalmic lenses constituting a pair of ophthalmic lenses can be modeled by Zernike polynomials, B-splines, or nurbs.

[0200] The merit function may be the sum of the squared residuals between the optical performance of the target ophthalmic lens and the optical performance of the ophthalmic lens (300). "Optical performance" can be understood as the wearer's refractive power, and / or astigmatism, and / or visual impairment.

[0201] The merit function is preferably calculated from a surface area defined by the contours of the first and second ophthalmic lenses.

[0202] In some embodiments, the translation and rotation transmitted from the front and / or rear of the first and second ophthalmic lenses are adjusted to match the refractive power of the first and second ophthalmic lenses at the hyperopia to the prescription for the wearer's left and right eyes, and to satisfy all constraints regarding the prescription and geometric shape of the rear of the first and second ophthalmic lenses.

[0203] FIGS. 3a through 9b disclose various embodiments of an ophthalmic lens according to the present invention. In these various embodiments of the present invention, the material of a pair of lenses is Mr8. The pair of ophthalmic lenses has the following mounting parameters, namely,

[0204] - Foreground angle -6 degrees,

[0205] - Facial angle 0 degrees, and

[0206] - Distance between the cornea of ​​the eye and the back of the ophthalmic lens: 12 mm

[0207] It is mounted on an augmented / virtual reality device to fit.

[0208] In the embodiments corresponding to FIGS. 3a to 6d, the rear surface of the ophthalmic lens has a flat shape. FIGS. 3a to 3d illustrate a first embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of +4D, and the lens is configured to be placed in front of the wearer's left eye. FIGS. 4a to 4d illustrate a second embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of +5D, a cylindrical power of -2D, and a cylindrical lens axis of 0 degrees, and the lens is configured to be placed in front of the wearer's right eye. FIGS. 3a and 4a show a map of the refractive power of the spherical or toroidal front surface of the ophthalmic lens before optimization, FIGS. 3b and 4b show a map of the refractive power after optimization, FIGS. 3c and 4c show a map of the astigmatism before optimization, and FIGS. 3d and 4d show a map of the astigmatism after optimization. It should be noted that once the optimization process is performed, the difference between the maximum and minimum values ​​of refractive power and astigmatism becomes less significant, making the use of the lens more comfortable for the wearer.

[0209] FIGS. 5a to 5d illustrate a third embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of -4D, configured such that the lens is positioned in front of the wearer's left eye. FIGS. 6a to 6d illustrate a fourth embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of -3D, a cylindrical power of -2D, and a cylindrical lens axis of 0 degrees, configured such that the lens is positioned in front of the wearer's right eye. FIGS. 5a and 6a show maps regarding the refractive power of the spherical or toroidal front surface of the ophthalmic lens prior to optimization, FIGS. 5b and 6b show maps regarding the refractive power after optimization, FIGS. 5c and 6c show maps regarding the astigmatism prior to optimization, and FIGS. 5d and 6d show maps regarding the astigmatism after optimization. It should be noted that once the optimization process is performed, the difference between the maximum and minimum values ​​of refractive power and astigmatism becomes less significant, making the use of the lens more comfortable for the wearer.

[0210] In relation to the embodiments described below, in which the rear surface of an ophthalmic lens is flat, convex, or concave, the rear surfaces of the left and right ophthalmic lenses generally have the same rear surface in various formulations.

[0211] FIGS. 7a to 7c illustrate a fifth embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of +5D, and the rear surface has a flat shape. FIGS. 8a to 8c illustrate a sixth embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of -7D, and the rear surface has a flat shape. FIGS. 7a and 8a show maps regarding the refractive power of the front surface of the ophthalmic lens after optimization, and FIGS. 7b and 8a show maps regarding the astigmatism after optimization. FIGS. 7c and 8c show vertical cross-sections of the ophthalmic lens according to the present embodiment.

[0212] The fifth and sixth embodiments disclose that excellent optical performance can be achieved for a wide range of spherical powers from -7D to +5D, wherein the optical lenses configured to be positioned in front of the wearer's left and right eyes have generally the same flat back surface.

[0213] FIGS. 9a to 9c illustrate a seventh embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of +5D, and the rear surface is a concave spherical surface having a surface spherical power of -4.54D. FIGS. 10a to 10c illustrate, respectively, eighth embodiments in which the ophthalmic lens is a single-focus lens having a spherical power of -7D, and the rear surface is a concave spherical surface having a surface spherical power of -4.54D. FIGS. 9a and 10a show maps regarding the refractive power of the front surface of the ophthalmic lens after optimization, and FIGS. 9b and 10b show maps regarding the astigmatism after optimization. FIGS. 9c and 10c show vertical cross-sections of the ophthalmic lens according to the present embodiment.

[0214] The 7th and 8th embodiments disclose that excellent optical performance can be achieved for a wide range of spherical powers from -7D to +5D, wherein the optical lenses configured to be placed in front of the wearer's left and right eyes have generally the same concave back surface.

[0215] FIGS. 11a to 11c illustrate a ninth embodiment in which the ophthalmic lens is a single-focus lens having a spherical power of +5D, and the rear surface is a convex spherical surface having a surface spherical power of +4.54D. FIGS. 12a to 12c illustrate, respectively, tenth embodiments in which the ophthalmic lens is a single-focus lens having a spherical power of -7D, and the rear surface is a convex spherical surface having a surface spherical power of +4.54D. FIGS. 11a and 12a show maps regarding the refractive power of the front surface of the ophthalmic lens after optimization, and FIGS. 11b and 12b show maps regarding the astigmatism after optimization. FIGS. 11c and 12c show vertical cross-sections of the ophthalmic lens according to the present embodiment.

[0216] The 9th and 10th embodiments disclose that excellent optical performance can be achieved for a wide range of spherical powers from -7D to +5D, wherein the optical lenses configured to be placed in front of the wearer's left and right eyes have generally the same convex rear surface.

[0217] The present invention has been described in detail using various embodiments without limiting it to the general concept of the invention.

[0218] Many additional modifications and variations will be apparent to those skilled in the art with reference to the aforementioned exemplary embodiments, which are provided merely as examples and are not intended to limit the scope of the invention as defined solely by the appended claims.

[0219] In the claims, the term “comprising” does not exclude other components or steps, and the singular forms “one” or “one” do not exclude the plural forms. The mere fact that different features are cited in different dependent claims does not imply that a combination of these features cannot be used advantageously. Reference numbers in the claims should not be interpreted as limiting the scope of the invention.

Claims

Claim 1 A pair of ophthalmic lenses suitable for a wearer whose prescriptions for the left and right eyes differ by more than 0.25D based on astigmatism power, wherein the posterior surfaces of both ophthalmic lenses correspond over at least 50% of the total posterior surface area of ​​the ophthalmic lenses, are symmetrical over at least 80% of each with respect to the meridian defining one nasal portion and the other temporal portion, and the prescription range is between -5D and 5D. Claim 2 A pair of ophthalmic lenses according to claim 1, wherein both ophthalmic lenses have a back surface in which the absolute difference in surface mean spherical power and the absolute difference in surface cylindrical power at a predetermined reference point is 0.1D or less. Claim 3 A pair of ophthalmic lenses according to claim 1 or 2, wherein both ophthalmic lenses have a back surface in which the absolute difference in the surface average spherical power and the absolute difference in the surface circumferential power at any point on a predetermined reference area is 0.1D or less. Claim 4 A pair of ophthalmic lenses according to claim 1 or 2, wherein both ophthalmic lenses have a flat back surface in which the absolute value of the surface average spherical power and the absolute value of the surface circumferential power at any point are 0.25D or less. Claim 5 A pair of ophthalmic lenses according to claim 1 or 2, wherein both ophthalmic lenses have a non-flat back surface having a surface average spherical degree of +0.25D or greater at any point. Claim 6 A pair of ophthalmic lenses according to claim 1 or 2, wherein both ophthalmic lenses have a convex back surface having a surface average spherical degree of +0.25D or more at any point. Claim 7 A pair of ophthalmic lenses according to claim 1 or 2, wherein both ophthalmic lenses have a concave back surface having a surface average spherical degree of -0.25D or less at any point. Claim 8 A pair of ophthalmic lenses configured to be mounted on a head-mounted display (HMD) device to provide a vision correction function to a wearer, in accordance with claim 1 or 2. Claim 9 A pair of ophthalmic lenses according to claim 1 or 2, wherein specific wearing conditions are determined according to the arrangement of the head-mounted display device to which the pair of ophthalmic lenses are applied. Claim 10 A pair of ophthalmic lenses according to claim 1 or 2, wherein each ophthalmic lens satisfies optical performance criteria related to visual impairment and / or refractive error and / or residual astigmatism error across the domain of gaze directions or lens area. Claim 11 A pair of ophthalmic lenses, wherein each ophthalmic lens is a single-focus ophthalmic lens, in paragraph 1 or 2. Claim 12 In paragraph 11, each monofocal ophthalmic lens is a pair of ophthalmic lenses having an absolute value of refractive error and a residual astigmatism error of 0.5D or less for directions of sight within 30 degrees from the primary gaze. Claim 13 In paragraph 11, a pair of ophthalmic lenses, each having a specific front surface. Claim 14 A pair of ophthalmic lenses, each having a non-spherical front surface in the 11th paragraph. Claim 15 A pair of ophthalmic lenses, each having an aspherical front surface, in paragraph 11. Claim 16 A method for implementing computer means for determining a pair of ophthalmic lenses according to claim 1 suitable for a wearer, comprising: a step of providing prescription data indicating a wearer’s prescription; a step of providing wearing condition data indicating a predetermined wearing condition; a step of providing back data indicating a shape of a back surface; and a step of determining a pair of ophthalmic lenses having a back surface having a shape according to the back data and a front surface configured to provide a vision correction function in accordance with the provided prescription under the predetermined wearing condition. Claim 17 A device for determining a pair of ophthalmic lenses according to claim 1 suitable for a wearer, comprising: - configured to receive prescription data indicating the wearer's prescription; - configured to receive wearing condition data indicating a predetermined wearing condition; - configured to receive rear data indicating the shape of the rear; and - comprising a processing circuit configured to determine a pair of ophthalmic lenses having a rear surface according to the rear data and a front surface configured to provide a vision correction function in accordance with the provided prescription under the predetermined wearing condition.

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