Soft contact lenses with a new stabilization zone for improved angle stability and comfort.

Abstract

To provide a soft toric contact lens capable of quickly returning to a final angular position.SOLUTION: Ophthalmic lenses are described herein. An example ophthalmic lens may comprise a first surface. The example ophthalmic lens may comprise a second surface located opposite the first surface. The second surface may be configured to abut at least a portion of an eye of a wearer. The example ophthalmic lens may comprise a lens stabilization zone disposed adjacent the first surface. At least a contour of the lens stabilization zone may be configured to minimize recovery time for the ophthalmic lens to orient itself to a resting position from a misaligned position.SELECTED DRAWING: Figure 1

Description

Background Art

[0001] Mechanical aspects relating to the angular position of soft toric contact lenses can be useful for visual performance. A first mechanical aspect can include the speed at which the contact lens returns to its final angular position. Angular misalignment may occur during initial lens insertion, or from mechanical intervention such as rubbing the eye (e.g., induced by the presence of a foreign body) or forceful blinking. The faster the lens reaches its final resting position, the faster a wearer wearing the lens (e.g., a user, etc.) can receive vision correction.

[0002] A second mechanical aspect can include the ability of the contact lens to maintain the same angular position relative to the eye. Similar lenses prescribed to multiple wearers can preferably rest angularly at the same position relative to each wearer's eye, whereby maintaining a lens angular position close to the horizontal axis can reduce the occurrence of selecting the next available cylindrical axis. The horizontal axis may be used as a reference for the cylindrical axis. The tighter the distribution of the resting angular positions of the lens, the more angularly stable the lens can be. Providing a tighter distribution of the resting angular positions of the lens can provide less visual fluctuation, especially for wearers requiring large astigmatism correction.

[0003] Stability can also be useful for wearers requiring more complex vision correction than astigmatism, such as higher-order aberration correction. Keratoconus is a good example of an eye condition that can benefit from such a design when the vision impairment associated with this condition is corrected through the use of contact lenses.

Summary of the Invention

Problem to be Solved by the Invention

[0004] Improvements are needed.

Means for Solving the Problem

[0005] An ophthalmic lens is described herein. An exemplary ophthalmic lens may comprise a first surface. An exemplary ophthalmic lens may comprise a second surface located opposite the first surface. The second surface may be configured to contact at least a portion of the wearer's eye. An exemplary ophthalmic lens may comprise a lens stabilization zone located adjacent to the first surface. At least the contour of the lens stabilization zone may be configured to minimize the recovery time for the ophthalmic lens to orient itself from a displaced position to a resting position.

[0006] Another exemplary ophthalmic lens may comprise a first surface. The exemplary ophthalmic lens may comprise a second surface located opposite the first surface. The second surface may be configured to contact at least a portion of the wearer's eye. The exemplary ophthalmic lens may comprise an active region located adjacent to the first surface. At least the contour of the active region may be configured based on the distribution of terrain slopes of one or more eyes of the object. [Brief explanation of the drawing]

[0007] The following drawings are illustrative examples, but not limiting, of the various embodiments considered in this disclosure. The drawings are as follows: [Figure 1] The contour plot of the radial thickness of an exemplary soft contact lens is shown. [Figure 2] An example of a misaligned toric contact lens is shown. The solid black lines represent the upper and lower eyelid profiles of any given eye. The circles represent the active region of the contact lens that drives lens rotation. [Figure 3]The diagram illustrates the wedge effect. The left side of the diagram shows the eyelid applying pressure in the direction normal to the lens surface. Because the pressure is perpendicular to the front surface of the lens, no lateral movement is generated. The right side of the diagram shows the eyelid applying pressure in a direction different from the surface normal. The direction of the pressure generates lateral movement in the active region, which provides the torque necessary to rotate the lens. [Figure 4] An example of a toric contact lens in its stationary position is shown. The solid black lines represent the upper and lower eyelid profiles of any given eye. The circles represent the active regions of the contact lens that drive lens stability during rotation. [Figure 5] A schematic diagram of the mean eyelid and its pressure band above the right eye, interacting with a toric lens using the DSZS approach for stability. The toric lens is represented by its radial thickness contour. The gray box represents the active region, which is the area of ​​interest. [Figure 6] This shows the average response to rotation of three lenses, lens #1, lens #2, and lens #3, calculated over 3.0 minutes (36 blinks, each lasting 5 seconds). Each average response was calculated from a set of 16 individual responses. [Figure 7] This shows the standard deviations of the angular positions of three lenses, lens #1, lens #2, and lens #3, calculated over a 3.0-minute period (36 blinks, each lasting 5 seconds). Each standard deviation response was calculated from a set of 16 individual responses. [Figure 8] The standard deviations obtained for lenses #1, #2, and #3, plotted against the average lens angular position, are shown. [Figure 9] This shows a cumulative histogram of terrain slope calculated across the active region for 100 pairs of human eyes. [Figure 10] The histograms of terrain slopes calculated across the active regions in front of lenses #1, #2, and #3 when each lens is perfectly aligned with the horizontal axis are shown. [Figure 11]This shows histograms of the terrain slope calculated across the active areas in front of lenses #1, #2, and #3 when each lens is shifted 10 degrees towards the nose. [Figure 12] The standard deviations of lenses #1, #2, and #3 for different lens positional deviations ranging from 0 to 10 degrees in the nose direction, relative to the cumulative distribution of terrain slopes below 45 degrees within the active region, are shown. [Modes for carrying out the invention]

[0008] The contact lenses described herein may have one or more stabilization zones. The stabilization zones may be contoured in such a manner that pressure from the eyelid can fix the contact lens in a certain position relative to the pupil of the eye. A first contour region may be located to the left of the pupil of the eye. A second contour region may be located to the right of the pupil of the eye. The contour regions may include outer and inner circumferences. As the contour region moves from the outer circumference to the inner circumference, the thickness of the contour region may generally increase. Having contour regions with generally increasing thickness to the left and right of the pupil of the eye allows pressure from the eyelid to stabilize the contact lens relative to the pupil in the horizontal position of the first contour region, similar to the horizontal position of the second contour region.

[0009] The ophthalmic lens may have a first surface. The ophthalmic lens may have a generally round shape. The ophthalmic lens may also have a non-round shape.

[0010] The ophthalmic lens may have a second surface positioned opposite the first surface. The second surface may be configured to contact at least a portion of the wearer's eye.

[0011] The ophthalmic lens may include a lens stabilization zone positioned adjacent to the first surface. At least the contour of the lens stabilization zone can be configured to minimize the recovery time required for the ophthalmic lens to orient itself from a displaced position to a resting position.

[0012] The ophthalmic lens may include a second lens stabilization zone positioned adjacent to the first surface. At least the contour of the second lens stabilization zone may be configured to minimize the recovery time for the ophthalmic lens to orient itself from a displaced position to a resting position through interaction with at least one eyelid of the wearer. The lens stabilization zone may be symmetrical with respect to the sagittal plane. The lens stabilization zone may be symmetrical with respect to the tangential plane. The lens stabilization zone may be symmetrical with respect to both the sagittal and tangential planes. The lens stabilization zone may not be symmetrical with respect to the sagittal plane. The lens stabilization zone may not be symmetrical with respect to the tangential plane. The lens stabilization zone may not be symmetrical with respect to both the sagittal and tangential planes.

[0013] The lens may have a region for the pupil. The first lens stabilization zone may be to the left of the region for the pupil when the lens is in the correct position. The second lens stabilization zone may be to the right of the region for the pupil when the lens is in the correct position. The lens stabilization zones may be at equal distances from the region for the pupil. The lens stabilization zones may not be at equal distances from the region for the pupil.

[0014] Each lens stabilization zone may have its own outer parameter. Each lens stabilization zone may have its own inner parameter. The first thickness may be associated with its respective outer parameter. The second thickness may be associated with its respective inner parameter. The lens stabilization zones may be contoured to transition smoothly and / or gradually from the first thickness to the second thickness. The contour regions of the first thickness, the second thickness, and / or between the first and second thicknesses may be configured such that pressure from the eyelid causes the lens to achieve the correct position relative to the area for the pupil.

[0015] The lens stabilization zone may be disposed at least partially within the active region of the lens based on expected interaction with at least one eyelid of a wearer. The expected interaction with at least one eyelid of the wearer can be based on the individual eye shape of the intended wearer. The expected interaction with at least one eyelid of the wearer can be based on a plurality of sample eyes. The expected interaction with at least one eyelid of the wearer may be based on one or more eyelid profiles. The expected interaction with at least one eyelid may include one or more blinks. The expected interaction with at least one eyelid may include an open position. The expected interaction with at least one eyelid may include a closed position. The expected interaction with at least one eyelid may include a resting position.

[0016] The one or more eyelid profiles may be in the form of a quadratic polynomial: a0+a1.x+a2.x 2 may have a Cartesian coordinate system according to, wherein a0 represents the palpebral fissure, which is the distance between the center of the pupil in the primary line of sight and the edge of the upper / lower eyelid, a1 is the slope of the eyelid at the position of the upper / lower palpebral fissure, a2 is the curvature at the same position, and x is the distance along the horizontal direction of the Cartesian coordinate system having its origin at the center of the pupil.

[0017] The recovery time may be less than 2 minutes for a 45 degree misalignment. The misaligned position may be greater than 5 degrees as measured angularly from the horizontal axis. The misaligned position may be greater than 10 degrees as measured angularly from the horizontal axis.

[0018] The ophthalmic lens may comprise one or more silicone hydrogels. The ophthalmic lens may comprise one or more conventional hydrogels.

[0019] A contact lens wearer can insert a contact lens into the wearer's eye. The contact lens may comprise two contoured stabilization zones. The contact lens may initially be out of position relative to the pupil of the eye. The wearer can blink the eye to cause pressure from the eyelid to be applied to the contact lens. Pressure from the eyelid can allow the contact lens to achieve the correct position relative to the pupil.

[0020] An ophthalmic lens can comprise a first surface. The ophthalmic lens may have a generally round shape. The ophthalmic lens may also have a non-round shape.

[0021] An ophthalmic lens can comprise a second surface disposed opposite the first surface. The second surface can be configured to abut at least a portion of a wearer's eye.

[0022] An ophthalmic lens may comprise an active region disposed adjacent to the first surface. At least the contour of the active region can be configured based on a distribution of topographic slopes of one or more eyes of a subject. The contour may have a cumulative topographic slope. The contour can be configured for interaction only with the upper eyelid or only with the lower eyelid.

[0023] An ophthalmic lens may comprise a second active region disposed adjacent to the first surface. At least the contour of the second active region can be configured based on a distribution of topographic slopes of one or more eyes of a subject. The active region may be symmetric relative to a sagittal plane. The active region may be symmetric relative to a tangential plane. The active region may be symmetric relative to both the sagittal plane and the tangential plane. The active region may not be symmetric relative to the sagittal plane. The active region may not be symmetric relative to the tangential plane. The active region may not be symmetric relative to either the sagittal plane or the tangential plane.

[0024] The lens may have a region for the pupil. The first active region may be to the left of the pupil region when the lens is in the correct position. The second active region may be to the right of the pupil region when the lens is in the correct position. The active regions may be at equal distances from the pupil region. The active regions may not be at equal distances from the pupil region.

[0025] Each active region may have its own outer parameter. Each active region may have its own inner parameter. The first thickness may be associated with its respective outer parameter. The second thickness may be associated with its respective inner parameter. The active regions may be contoured to transition smoothly and / or gradually from the first thickness to the second thickness. The contour regions of the first thickness, the second thickness, and / or between the first and second thicknesses may be configured such that pressure from the eyelid causes the lens to achieve the correct position relative to the area for the pupil.

[0026] The active region may be configured based on the expected interaction with at least one eyelid of the wearer. The expected interaction with at least one eyelid of the wearer may be based on the individual eye shape of the wearer in question. The expected interaction with at least one eyelid of the wearer may be based on the eyes of multiple samples. The expected interaction with at least one eyelid may be based on one or more eyelid profiles. The expected interaction with at least one eyelid may include one or more blinks. The expected interaction with at least one eyelid may include an open position. The expected interaction with at least one eyelid may include a closed position. The expected interaction with at least one eyelid may include a resting position.

[0027] One or more eyelid profiles may have a Cartesian coordinate system in the form of a quadratic polynomial: a0 + a1.x + a2.x², where a0 represents the palpebral fissure, which is the distance between the pupillary center and the margin of the palpebral fissure in the primary line of sight; a1 is the inclination of the eyelid at the location of the palpebral fissure; a2 is the curvature at the same location; and x is the distance along the horizontal direction in a Cartesian coordinate system whose origin is at the pupillary center.

[0028] At least the contour of the active region can be configured to minimize the recovery time required for the ophthalmic lens to orient itself from a displaced position to a resting position. The recovery time may be less than 2 minutes for a 45-degree displacement. The displaced position may be greater than 5 degrees when measured from the horizontal axis. The displaced position may be greater than 10 degrees when measured from the horizontal axis.

[0029] The ophthalmic lens may contain one or more types of silicone hydrogels. The ophthalmic lens may contain one or more types of conventional hydrogels.

[0030] A contact lens wearer can insert the contact lens into their eye. The contact lens may have two contoured active areas. The contact lens may initially be out of position relative to the pupil of the eye. The wearer can blink their eye to apply pressure from their eyelid to the contact lens. This pressure from the eyelid can help the contact lens achieve the correct position relative to the pupil.

[0031] Figure 1 illustrates a typical dual stabilization zone system on an exemplary lens. Figure 1 shows a contour map of the radial thickness of a lens with -3.00D / -0.75D@180°Rx. The stabilization zone, located within the outer region of the lens, also called the peripheral region, exhibits a greater thickness along the horizontal axis than the vertical thickness of the peripheral region. The geometric shape of the stabilization zone follows the outer contour of the lens.

[0032] Such reorientation and stabilization of the lens are driven by the pressure exerted by the upper and lower eyelids on the front surface of the lens. When the lens is angularly displaced (Figure 2), the eyelids exert pressure on the lens within the active region, where a large thickness gradient exists and acts as a wedge (Figure 3), resulting in a torque that rotates the lens clockwise, as provided in the embodiment. Regions of the lens in contact with the eyelids that do not have a large thickness gradient do not contribute to the rotation of the lens due to the lack of a wedge effect. Once the lens reaches its final angular position (Figure 4), all four active regions balance each other within the eyelids (temporal and nasal regions) and between the eyelids (upper and lower regions), maintaining the lens in its resting position.

[0033] This specification describes a novel toric lens design in which angular stabilization is provided by a dual stabilization zone system (DSZS), in which the active area of ​​the contact lens is optimized for angular stability when such a lens reaches its final angular resting position.

[0034] The mean eyelid profile was obtained from measurements of multiple profiles collected for the right eye across a group of 100 subjects representing different ethnicities (Caucasian, East Asian, and Indian / Middle Eastern). Each eyelid profile was described in Cartesian coordinates in the form of the following quadratic polynomial. a0 + a1.x + a2.x 2

[0035] In the formula, a0 represents the palpebral fissure, which is the distance between the pupillary center and the margin of the upper / lower eyelid in the primary line of sight; a1 is the inclination of the eyelid at the location of the palpebral fissure; a2 is the curvature at the same location; and x is the distance along the horizontal direction in a Cartesian coordinate system whose origin is at the pupillary center. Table 1 below provides the coefficients of the polynomial describing the average geometric shape of the upper and lower eyelids calculated across 100 subjects of different ethnicities.

[0036] [Table 1]

[0037] The region of interaction between the upper eyelid and the lens was defined as a band following the contour of the upper eyelid (Figure 5). The band width below the upper eyelid contour was set to 0.25 mm and the band width above the eyelid contour was set to 0.50 mm, under the condition that the total band width of 0.75 mm, representing the eyelid pressure band along the eyelid, exerts direct pressure on the eye or contact lens when such a lens is worn.

[0038] For those familiar with this type of work, it should be obvious that the average eyelid contour can be replaced by an average contour representing an individual contour or a specific ethnicity. For example, the average contour could represent a Caucasian or Asian group with a very distinctive eyelid geometry.

[0039] The rotation of a toric lens is primarily driven by the pressure exerted by the upper and lower eyelids, as well as the movement of the upper eyelid during the blinking cycle, more specifically, by the interaction between the upper eyelid and the stabilization zone of the soft contact lens. The active region (Figure 5) is defined as the region of the upper eyelid that directly interacts with the lens stabilization zone. In the provided embodiment, the start of the active region was defined at a horizontal coordinate of 4.00 mm. At horizontal coordinates below 4.00 mm, the upper eyelid has no interaction with the lens stabilization zone. At this position, a blended region can usually be found that connects the outer edge of the optical zone to the inner region of the periphery. For those familiar with toric soft contact lenses, it should be obvious that the start point of the active region must be adjusted according to the dimensions of the soft contact lens and the position of the stabilization zone incorporated within that contact lens.

[0040] In one embodiment, the contour of the stabilization zone is modified so that the distribution of inclination within the active region interacting with the eyelid pressure band better matches the distribution calculated across a pair of eyes when the orientation of the contact lens corresponds to its final resting position (the lens is aligned with the horizontal axis).

[0041] In another embodiment, the contour of the stabilization zone is modified so that when the contact lens is displaced 10 degrees counterclockwise from its final resting position, the distribution of the slope within the active region interacting with the eyelid pressure band better matches the distribution calculated across a pair of eyes.

[0042] Better tilt match means a more natural lens-eyelid interaction compared to the eye-eyelid interaction when no lens is present on the eye. This means less eyelid deformation and therefore a more comfortable lens to wear. [Examples]

[0043] In the first embodiment, a soft toric contact lens (lens #1) is first evaluated for lens rotation and stability. The evaluation was performed using a population of 16 eyes from which eye topography and eyelid geometry were measured. Rotation and stability data were obtained using a rotation and centration simulation model (US Patent No. 8,403,479). A toric lens with Rx-3.00D / -0.75D@180 degrees was shifted 25 degrees nasally, and lens reorientation was observed over 36 blink cycles, each lasting 5 seconds. The mean lens rotation (Figure 6) and standard deviation (Figure 7) were calculated over the entire time frame.

[0044] In the second embodiment, a soft toric contact lens (lens #2) with the same formulation as lens #1 was evaluated using the same conditions and eye population as in Example 1. The mean lens rotation (Figure 6) and standard deviation (Figure 7) were calculated over the entire time frame.

[0045] In the third embodiment, a soft toric contact lens (lens #3) with the same formulation as lens #1 was evaluated using the same conditions and eye population as in Example 1. The mean lens rotation (Figure 6) and standard deviation (Figure 7) were calculated over the entire time frame.

[0046] All three lenses exhibit similar responses in lens reorientation. All lenses converge to a final angular resting position close to the horizontal. To better compare these lenses with one another, the standard deviations were plotted against the average lens angular position (Figure 8). Thus, Figure 8 provides the standard deviations of each lens against the same average angular position.

[0047] Lenses #2 and #3 were designed to have the same base curve geometry, central thickness, maximum peripheral thickness along the horizontal meridian, and minimum peripheral thickness along the vertical meridian as lens #1. The only geometry that affects rotational and stability performance is the front geometry of the stabilization zone located in the peripheral region.

[0048] Figure 9 is a cumulative histogram of terrain slope calculated across 100 pairs of eyes within the active region. These eyes are a mixture of Caucasian, East Asian, and Indian / Middle Eastern eyes. Terrain slope is defined as the steepest slope calculated at a single location. The slope ranges from approximately 25 to 45 degrees.

[0049] Figure 10 shows the terrain inclination within the same active area on the front surface of lenses #1, #2, and #3 when the horizontal axis is the optimal angular position that the contact lenses can take when they reach their resting position, and when each lens is perfectly aligned. Figure 11 shows the terrain inclination within the same active area on the front surface of lenses #1, #2, and #3 when each lens is misaligned by 10 degrees towards the nose. Since the cylindrical axis of toric lenses is usually provided in 10-degree increments, a toric lens that rests on the eye with a misalignment greater than 5 degrees from the prescribed cylindrical axis is usually adjusted by selecting the next cylindrical axis to reduce the axial error to less than 5 degrees. Therefore, considering a case where the lens is misaligned by 10 degrees is very conservative, as it never occurs with a properly fitted lens to the patient.

[0050] In one embodiment, the stabilization zone of lens #3 was designed so that the front surface within the active region better matched the cumulative terrain slope calculated for 100 sets of human eyes. Specifically, the cumulative distribution of terrain slopes below 45 degrees within the active region exhibited a higher percentage than the cumulative distribution of terrain slopes for lens #1 (Table 2 below). In other words, the higher the cumulative distribution of terrain slopes below 45 degrees, the larger the area within the active region that matches the corneal tilt. In a second embodiment, the stabilization zone of lens #2 was designed so that the front surface within the active region did not match the cumulative terrain slope, and the cumulative distribution of terrain slopes below 45 degrees within the active region exhibited a lower percentage than the cumulative distribution of terrain slopes for lens #1.

[0051] For anyone familiar with toric soft contact lenses, it should be obvious that the threshold angle can vary based on the population of eyes for which the lens is designed. In the proposed embodiment, the threshold angle is based on a mixed population of eyes. The threshold angle may also be ethnic-specific or of other types if the toric soft contact lens is designed for a particular type of eye.

[0052] [Table 2]

[0053] The average angular response obtained for lens #3 over 3.0 minutes of lens reorientation closely matches the average angular stability of lens #1, and exhibits better lens angular stability under the condition of a smaller standard deviation. The average angular response obtained for lens #2 over 3 minutes of lens reorientation still matches the average angular stability of lens #1, but exhibits worse lens angular stability under the condition of a larger standard deviation.

[0054] Figure 12 shows the standard deviation of each lens for different lens misalignments in the nasal direction ranging from 0 to 10 degrees, with respect to the cumulative distribution of terrain slopes below 45 degrees within the active region. Figure 12 shows that toric lenses with a cumulative distribution of frontal terrain slopes greater than 38% provide better angular stability than toric lenses with a cumulative distribution of terrain slopes below 38%. Preferably, the cumulative distribution should be greater than 48%.

[0055] While the illustrated and described embodiments are considered to be the most practical and preferred embodiments, it will be apparent that modifications from the specific designs and methods described and illustrated are themselves obvious to those skilled in the art and can be used without departing from the spirit and scope of the invention. The invention is not limited to the specific configurations described and illustrated, but should be configured to be consistent with all modifications that may fall within the appended claims.

[0056] [Implementation Method] (1) Eye lenses, The first surface and A second surface located on the opposite side of the first surface, configured to contact at least a portion of the wearer's eye, A lens stabilization zone disposed adjacent to the first surface, wherein at least the contour of the lens stabilization zone is configured to minimize the recovery time for the ophthalmic lens to face from a displaced position to a stationary position, Equipped with, Eye lenses. (2) The ophthalmic lens according to Embodiment 1, wherein the ophthalmic lens has a generally round shape. (3) The ophthalmic lens according to Embodiment 1, wherein the ophthalmic lens has a non-round shape. (4) The ophthalmic lens according to Embodiment 1, further comprising a second lens stabilization zone positioned adjacent to the first surface. (5) The ophthalmic lens according to Embodiment 4, wherein at least the contour of the second lens stabilization zone is configured to minimize the recovery time for the ophthalmic lens to orient itself from a displaced position to a resting position due to interaction with at least one eyelid of the wearer.

[0057] (6) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is symmetrical with respect to the sagittal plane. (7) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is symmetrical with respect to the tangential plane. (8) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is symmetrical with respect to the sagittal plane and the tangential plane. (9) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is not symmetrical with respect to the sagittal plane. (10) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is not symmetrical with respect to the tangential plane.

[0058] (11) The ophthalmic lens according to Embodiment 4, wherein the lens stabilization zone is not symmetrical with respect to the sagittal and tangential planes. (12) The ophthalmic lens according to Embodiment 1, wherein the lens stabilization zone is at least partially located within the active region of the lens based on the expected interaction with the wearer's at least one eyelid. (13) The eye lens according to Embodiment 12, wherein the expected interaction with the wearer's at least one eyelid is based on the individual eye shape of the wearer in question. (14) The ophthalmic lens according to Embodiment 12, wherein the expected interaction with the wearer's at least one eyelid is based on the eyes of multiple samples. (15) The ophthalmic lens according to Embodiment 12, wherein the expected interaction with the wearer's at least one eyelid is based on one or more eyelid profiles.

[0059] (16) The eye lens according to Embodiment 15, wherein one or more eyelid profiles have a Cartesian coordinate system in the form of a quadratic polynomial: a0 + a1.x + a2.x², where a0 represents the upper / lower palpebral fissure, which is the distance between the center of the pupil and the edge of the upper / lower eyelid in the primary line of sight; a1 is the inclination of the eyelid at the location of the upper / lower palpebral fissure; a2 is the curvature at the same location; and x is the distance along the horizontal direction of the Cartesian coordinate system, with the origin of the Cartesian coordinate system at the center of the pupil. (17) The eye lens according to Embodiment 12, wherein the expected interaction with the wearer's at least one eyelid is based on at least one eyelid in a given line of sight direction. (18) The ophthalmic lens according to Embodiment 1, wherein the recovery time is less than 2 minutes for a 45-degree displacement. (19) The eye lens according to Embodiment 1, wherein the misaligned position is greater than 5 degrees when measured in angle from the horizontal axis. (20) The eye lens according to Embodiment 1, wherein the misaligned position is greater than 10 degrees when measured in angle from the horizontal axis.

[0060] (21) A method for manufacturing the ophthalmic lens described in Embodiment 1. (22) Eye lenses, The first surface and A second surface located on the opposite side of the first surface, configured to contact at least a portion of the wearer's eye, An active region located adjacent to the first surface, wherein at least the contour of the active region is configured based on the distribution of terrain slopes of one or more eyes of the object; Equipped with, Eye lenses. (23) The ophthalmic lens according to embodiment 22, wherein the contour has a cumulative terrain slope. (24) The ophthalmic lens according to Embodiment 22, wherein the contour is configured to interact with only the upper eyelid or only the lower eyelid. (25) The ophthalmic lens according to Embodiment 22, wherein the ophthalmic lens has a generally round shape.

[0061] (26) The ophthalmic lens according to Embodiment 22, wherein the ophthalmic lens has a non-round shape. (27) The ophthalmic lens according to embodiment 22, further comprising a second active region disposed adjacent to the first surface. (28) The eye lens according to Embodiment 27, wherein at least the contour of the second active region is configured based on the distribution of terrain slopes of one or more eyes of the subject. (29) The ophthalmic lens according to Embodiment 27, wherein the active region is symmetrical with respect to the sagittal plane. (30) The ophthalmic lens according to Embodiment 27, wherein the active region is symmetrical with respect to the tangential plane.

[0062] (31) The ophthalmic lens according to Embodiment 27, wherein the active region is symmetrical with respect to the sagittal plane and the tangential plane. (32) The ophthalmic lens according to Embodiment 27, wherein the active region is not symmetrical with respect to the sagittal plane. (33) The ophthalmic lens according to Embodiment 27, wherein the active region is not symmetrical with respect to the tangential plane. (34) The ophthalmic lens according to Embodiment 27, wherein the active region is not symmetrical with respect to the sagittal and tangential planes. (35) The eye lens according to Embodiment 22, wherein the active region is configured based on the expected interaction with the wearer's at least one eyelid.

[0063] (36) The eye lens according to Embodiment 35, wherein the expected interaction with the wearer's at least one eyelid is based on the individual eye shape of the wearer in question. (37) The ophthalmic lens according to Embodiment 35, wherein the expected interaction with the wearer's at least one eyelid is based on the eyes of multiple samples. (38) The ophthalmic lens according to Embodiment 35, wherein the expected interaction with the wearer's at least one eyelid is based on one or more eyelid profiles. (39) The eye lens according to Embodiment 38, wherein one or more eyelid profiles have a Cartesian coordinate system in the form of a quadratic polynomial: a0 + a1.x + a2.x², where a0 represents the upper / lower palpebral fissure, which is the distance between the center of the pupil and the edge of the upper / lower eyelid in the primary line of sight; a1 is the inclination of the eyelid at the location of the upper / lower palpebral fissure; a2 is the curvature at the same location; and x is the distance along the horizontal direction of the Cartesian coordinate system, with the origin of the Cartesian coordinate system at the center of the pupil. (40) The eye lens according to Embodiment 35, wherein the expected interaction with the wearer's at least one eyelid is based on at least one eyelid in a given line of sight direction.

[0064] (41) The ophthalmic lens according to Embodiment 22, wherein at least the contour of the active region is configured to minimize the recovery time for the ophthalmic lens to face from a displaced position to a resting position. (42) The ophthalmic lens according to Embodiment 41, wherein the recovery time is less than 2 minutes for a 45-degree displacement. (43) The ophthalmic lens according to Embodiment 41, wherein the misaligned position is greater than 5 degrees when measured in angle from the horizontal axis. (44) The ophthalmic lens according to Embodiment 41, wherein the misaligned position is greater than 10 degrees when measured in angle from the horizontal axis. (45) The method for manufacturing the ophthalmic lens according to Embodiment 22.

Claims

[Claim 1] A method for designing toric contact lenses, The aforementioned toric contact lens, The first surface and A second surface located on the opposite side of the first surface, configured to contact at least a portion of the wearer's eye, The first surface is provided with a lens stabilization zone located adjacent to it, The design method for toric contact lenses is The lens stabilization zone is designed on the front surface within the active region based on a cumulative distribution of terrain slopes below 45 degrees calculated for multiple human eyes, The active region is defined as a region of the upper eyelid that directly interacts with the lens stabilization zone. The aforementioned terrain slope is defined as the steepest slope calculated at a single location. The lens stabilization zone is designed such that the cumulative distribution of terrain slopes below 45 degrees within the active region is greater than 38%, in order to provide rotational torque that causes the toric contact lens to move from an angularly misaligned rotational position to a stationary position. Design methods for toric contact lenses.

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