Soft contact lens with new stabilization zones for improved angular 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 technology]

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

[0002] The second mechanical aspect can include the ability of the contact lens to maintain the same angular position relative to the eye. Similar lenses prescribed for multiple wearers can preferably rest angularly in the same position relative to each wearer's eye, thereby reducing the occurrence of selecting the next available cylindrical axis by maintaining the lens angular position close to the horizontal axis. The horizontal axis may be used as a reference for the cylindrical axis. The tighter the distribution of the rest angular positions of the lens, the more angularly stable the lens can be. Providing a tighter distribution of the rest angular positions of the lens can provide less vision variability, especially for wearers who require large astigmatism correction.

[0003] Stability may also be useful for wearers who require more complex vision correction than astigmatism, such as higher order aberration correction. The keratoconus condition is a good example of an eye disease that could benefit from such a design, where the vision deficiencies associated with this condition are corrected with the use of contact lenses. Summary of the Invention [Problem to be solved by the invention]

[0004] Improvement is needed. [Means for solving the problem]

[0005] Ophthalmic lenses are described herein. An exemplary ophthalmic lens may include a first surface. An exemplary ophthalmic lens may include a second surface disposed opposite the first surface. The second surface may be configured to abut at least a portion of a wearer's eye. An exemplary ophthalmic lens may include a lens stabilization zone disposed adjacent to the first surface. At least a contour of the lens stabilization zone may be configured to minimize a recovery time for the ophthalmic lens to orient from a misaligned position to a rest position.

[0006] Another exemplary ophthalmic lens may include a first surface. The exemplary ophthalmic lens may include a second surface disposed opposite the first surface. The second surface may be configured to abut at least a portion of a wearer's eye. The exemplary ophthalmic lens may include an active area disposed adjacent to the first surface. At least a contour of the active area may be configured based on a distribution of topographical slopes of one or more eyes of a subject. [Brief description of the drawings]

[0007] The following drawings illustrate generally, by way of example, but not by way of limitation, various embodiments contemplated in the present disclosure. [Figure 1] 1 shows a contour plot of the radial thickness of an exemplary soft contact lens. [Diagram 2] 1 shows an example of a misaligned toric contact lens. The solid black lines represent the upper and lower eyelid profiles of an arbitrary eye. The circles represent the active areas of the contact lens that drive the lens rotation. [Diagram 3]Figure 1 shows an illustration of the wedge effect. In the left part of the drawing, it is shown that the eyelid exerts pressure in a direction normal to the surface of the lens. Since the pressure is perpendicular to the front surface of the lens, no lateral movement is produced. In the right part of the drawing, it is shown that the eyelid exerts pressure in a direction different from the normal to the surface. The direction of pressure produces a lateral movement in the active area that provides the necessary torque to rotate the lens. [Figure 4] 1 shows an example of a toric contact lens in its rest position. The solid black lines represent the upper and lower eyelid profiles of an arbitrary eye. The circles represent the active areas of the contact lens that drive the lens stability in rotation. [Diagram 5] FIG. 1 shows a schematic diagram of an average eyelid and its pressure band on a right eye interacting with a toric lens using the DSZS approach for stability. The toric lens is represented by the radial thickness contour. The grey box represents the active area, which is the region of interest. [Figure 6] Shown are the average responses in rotation for three lenses, Lens #1, Lens #2, and Lens #3, calculated over a 3.0 minute period (36 blinks of 5 second duration each), each average response calculated from a set of 16 individual responses. [Figure 7] Shown is the standard deviation of the angular position of three lenses, Lens #1, Lens #2, and Lens #3, calculated over a 3.0 minute period (36 blinks of 5 second duration each). Each standard deviation response was calculated from a set of 16 individual responses. [Figure 8] Shown is the standard deviation obtained for Lens #1, #2, and Lens #3 plotted against the average lens angle position. [Figure 9] A cumulative histogram of topographical slope calculated over the active area is shown for 100 human eye pairs. [Figure 10] 1 shows histograms of topographical slope calculated over the anterior active area of ​​lenses #1, #2, and #3 when each lens is perfectly aligned with the horizontal axis. [Figure 11]1 shows histograms of topographical slope calculated over the anterior active area of ​​lenses #1, #2, and #3 when each lens is misaligned nasally by 10 degrees. [Figure 12] 1 shows the standard deviation for lenses #1, #2, and #3 for different lens misalignments ranging from 0 degrees to 10 degrees nasally relative to the cumulative distribution of topographic slopes below 45 degrees within the active area. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The contact lenses described herein may include one or more stabilization zones. The stabilization zones may be contoured in such a manner that pressure from the eyelid can secure the contact lens in a position relative to the pupil of the eye. The first contoured region may be to the left of the pupil of the eye. The second contoured region may be to the right of the pupil of the eye. The contoured region may include an outer periphery and an inner periphery. Moving from the outer periphery toward the inner periphery, the contoured region may generally increase in thickness. Having contoured regions with generally increasing thickness to the left and right of the pupil of the eye can allow pressure from the eyelid to stabilize the contact lens relative to the pupil in a horizontal position of the first contoured region similar to the horizontal position of the second contoured region.

[0009] The ophthalmic lens may comprise 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 can include a second surface disposed opposite the first surface, the second surface can be configured to abut at least a portion of the wearer's eye.

[0011] The Ophthalmic Lens may comprise a Lens Stabilization Zone disposed adjacent to the first surface, wherein at least a contour of the Lens Stabilization Zone may be configured to minimize a recovery time for the Ophthalmic Lens to orient from a misaligned position to a rest position.

[0012] The Ophthalmic Lens may include a second lens stabilization zone disposed adjacent to the first surface. At least a contour of the second lens stabilization zone may be configured to minimize recovery time for the Ophthalmic Lens to orient from a displaced position to a rest position upon interaction with at least one eyelid of the wearer. The lens stabilization zone may be symmetrical about a sagittal plane. The lens stabilization zone may be symmetrical about a tangential plane. The lens stabilization zone may be symmetrical about a sagittal plane and a tangential plane. The lens stabilization zone may not be symmetrical about a sagittal plane. The lens stabilization zone may not be symmetrical about a tangential plane. The lens stabilization zone may not be symmetrical about a sagittal plane and a tangential plane.

[0013] The lens may include an area for the pupil. A first lens stabilization zone may be to the left of the area for the pupil when the lens is in position. A second lens stabilization zone may be to the right of the area for the pupil when the lens is in position. The lens stabilization zones may be equal distances from the area for the pupil. The lens stabilization zones may not be equal distances from the area for the pupil.

[0014] Each lens stabilization zone may have a respective outer parameter. Each lens stabilization zone may have a respective inner parameter. A first thickness may be associated with each outer parameter. A second thickness may be associated with each inner parameter. The lens stabilization zones may be contoured to transition smoothly and / or gradually from the first thickness to the second thickness. The first thickness, the second thickness, and / or the contoured area between the first thickness and the second thickness 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 located at least partially within the active area of ​​the lens based on an expected interaction with at least one eyelid of the wearer. The expected interaction with the at least one eyelid of the wearer may be based on an individual eye shape of the target wearer. The expected interaction with the at least one eyelid of the wearer may be based on a plurality of sample eyes. The expected interaction with the at least one eyelid of the wearer may be based on one or more eyelid profiles. The expected interaction with the at least one eyelid may include one or more blinks. The expected interaction with the at least one eyelid may include an open position. The expected interaction with the at least one eyelid may include a closed position. The expected interaction with the at least one eyelid may include a rest position.

[0016] One or more eyelid profiles are expressed as quadratic polynomials of the form: a0+a1.x+a2.x 2 where a0 represents the upper / lower palpebral fissure, which is the distance between the pupil center and the edge of the upper / lower eyelid at the primary gaze, a1 is the slope of the eyelid at the location of the upper / lower palpebral fissure, a2 is the curvature at that same location, and x is the distance along the horizontal direction of the Cartesian coordinate system which has its origin at the center of the pupil.

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

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

[0019] A contact lens wearer may insert the contact lens into the wearer's eye. The contact lens may include two contoured stabilization zones. The contact lens may be initially out of place relative to the pupil of the eye. The wearer may blink the eye causing pressure from the eyelid to be applied to the contact lens. The pressure from the eyelid causes the contact lens to achieve the correct position relative to the pupil.

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

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

[0022] The Ophthalmic Lens may include an active area disposed adjacent to the first surface. At least a contour of the active area may be configured based on a distribution of topographical slopes of one or more eyes of a subject. The contour may have a cumulative topographical slope. The contour may be configured for interaction with only the upper eyelid or only the lower eyelid.

[0023] The ophthalmic lens may comprise a second active area disposed adjacent to the first surface. At least a contour of the second active area may be configured based on a distribution of topographical slopes of one or more eyes of the subject. The active area may be symmetrical about a sagittal plane. The active area may be symmetrical about a tangential plane. The active area may be symmetrical about a sagittal plane and a tangential plane. The active area may not be symmetrical about a sagittal plane. The active area may not be symmetrical about a tangential plane. The active area may not be symmetrical about a sagittal plane and a tangential plane.

[0024] The lens may comprise an area for the pupil. The first active area may be to the left of the area for the pupil when the lens is in the correct position. The second active area may be to the right of the area for the pupil when the lens is in the correct position. The active areas may be equidistant from the area for the pupil. The active areas may not be equidistant from the area for the pupil.

[0025] Each of the active areas may have a respective outer parameter. Each of the active areas may have a respective inner parameter. A first thickness may be associated with the respective outer parameter. A second thickness may be associated with the respective inner parameter. The active areas may be contoured to transition smoothly and / or gradually from the first thickness to the second thickness. The first thickness, the second thickness, and / or the contoured area between the first thickness and the second thickness 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 area may be configured based on an expected interaction with at least one eyelid of the wearer. The expected interaction with the at least one eyelid of the wearer may be based on an individual eye shape of the target wearer. The expected interaction with the at least one eyelid of the wearer may be based on a plurality of sample eyes. The expected interaction with the at least one eyelid of the wearer may be based on one or more eyelid profiles. The expected interaction with the at least one eyelid may include one or more blinks. The expected interaction with the at least one eyelid may include an open position. The expected interaction with the at least one eyelid may include a closed position. The expected interaction with the at least one eyelid may include a rest position.

[0027] The one or more eyelid profiles may have a Cartesian coordinate system with a quadratic polynomial form: a0+a1.x+a2.x2, where a0 represents the upper / lower palpebral fissure, which is the distance between the pupil center and the edge of the upper / lower eyelid at the primary gaze, a1 is the slope of the eyelid at the location of the upper / lower palpebral fissure, a2 is the curvature at that same location, and x is the distance along the horizontal direction of the Cartesian coordinate system that has its origin at the center of the pupil.

[0028] At least a contour of the active area may be configured to minimize a recovery time for the Ophthalmic Lens to orient from the misaligned position to the rest position. The recovery time may be less than 2 minutes for a 45 degree misalignment. The misaligned position may be greater than 5 degrees measured in degrees from the horizontal axis. The misaligned position may be greater than 10 degrees measured in degrees from the horizontal axis.

[0029] The ophthalmic lenses may comprise one or more silicone hydrogels.The ophthalmic lenses may comprise one or more conventional hydrogels.

[0030] A contact lens wearer may insert the contact lens into the wearer's eye. The contact lens may include two contoured active areas. The contact lens may initially be out of place relative to the pupil of the eye. The wearer may blink the eye causing pressure from the eyelid to be applied to the contact lens. The pressure from the eyelid causes the contact lens to achieve the correct position relative to the pupil.

[0031] FIG. 1 illustrates a standard dual stabilization zone system on an exemplary lens. FIG. 1 represents a contour map of the radial thickness of a -3.00D / -0.75D@180 degrees Rx lens. The stabilization zone located in the outer region of the lens, also called the peripheral region, exhibits a greater thickness centered along the horizontal direction than the vertical thickness of the peripheral region. The geometry of the stabilization zone follows the outer contour of the lens.

[0032] The reorientation and stability of such a lens is driven from the pressure exerted by the upper and lower eyelids on the front surface of the lens. When the lens is angularly misaligned (Figure 2), the eyelids, where there is a large gradient thickness and act as a wedge (Figure 3), exert pressure on the lens in the active areas, resulting in a torque that rotates the lens in a clockwise direction as provided in the example. The areas 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. When the lens reaches its final angular position (Figure 4), all four active areas will balance each other within and between the eyelids (temporal and nasal regions) and maintain the lens in its rest position.

[0033] Described herein is a new 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 lens reaches its final angular rest position.

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

[0035] where a0 represents the upper / lower palpebral fissure, which is the distance between the pupil center and the edge of the upper / lower eyelid at the primary gaze, a1 is the slope of the eyelid at the location of the upper / lower palpebral fissure, a2 is the curvature at that same location, and x is the distance along the horizontal direction of a Cartesian coordinate system with its origin at the center of the pupil. Table 1 below provides the coefficients of the polynomials describing the average geometry of the upper and lower eyelids calculated across 100 subjects of different ethnicities.

[0036] [Table 1]

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

[0038] It should be apparent to those familiar with such work that the average eyelid contour can be replaced by an average contour representative of an individual or a particular ethnicity, for example, the average contour can represent a Caucasian or Asian population, both of which have very distinctive eyelid geometries.

[0039] The lens rotation of a toric lens is mainly driven by the pressure exerted by the upper and lower eyelids, as well as the movement of the upper eyelid during the blink cycle, more specifically by the interaction of the upper eyelid with the stabilization zone of the soft contact lens. The active area (FIG. 5) is defined as the area of ​​the upper eyelid that directly interacts with the lens stabilization zone. In the example provided, the start of the active area was defined at a horizontal coordinate of 4.00 mm. At horizontal coordinates below 4.00 mm, the upper eyelid does not have any interaction with the lens stabilization zone. At this position, one can usually find the blend area that connects the outer edge of the optical zone to the inner peripheral area. It should be clear to those familiar with toric soft contact lenses that the start of the active zone must be adjusted according to the dimensions of the soft contact lens and the location of the stabilization zone incorporated in that contact lens.

[0040] In one aspect, the contour of the stabilization zone is modified so that when the contact lens is oriented to correspond to its final rest position (lens aligned with the horizontal axis), the distribution of slopes within the active area interacting with the eyelid pressure band better matches that distribution calculated across a set of eyes.

[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 rest position, the distribution of slopes within the active area interacting with the eyelid pressure band better matches that distribution calculated across a set of eyes.

[0042] A better slope match means a more natural lens-lid interaction compared to the eye-lid interaction when no lens is present on the eye, which means less deformation of the eyelid and therefore a lens that is more comfortable to wear. EXAMPLES

[0043] In a first example, a soft toric contact lens (Lens #1) is first evaluated for lens rotation and stability. Evaluation was performed using a group of 16 eyes where the eye topography and eyelid geometry were measured. Rotation and stability data was obtained using a rotation and centration simulation model (U.S. Pat. No. 8,403,479). An Rx-3.00D / -0.75D@180 degree toric lens was displaced nasally by 25 degrees and the lens reorientation was observed over 36 blink cycles, with each blink cycle lasting 5 seconds. The average lens rotation (FIG. 6) and standard deviation (FIG. 7) were calculated over the entire time frame.

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

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

[0046] All three lenses exhibit similar responses in lens reorientation. All lenses converge to a final angular rest position close to horizontal. To better compare these lenses to each other, the standard deviation was plotted against the average lens angular position (FIG. 8). Thus, FIG. 8 provides the standard deviation of each lens for the same average angular position.

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

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

[0049] FIG. 10 displays the topographical slopes in the same active area on the front surface of lenses #1, #2, and #3 when each lens is perfectly aligned with the horizontal axis, which is the optimal angular position that the contact lens can assume when it reaches its rest position. FIG. 11 displays the topographical slopes in the same active area on the front surface of lenses #1, #, and #3 when each lens is misaligned by 10 degrees in the nasal direction. Since the cylinder axes of toric lenses are usually provided every 10 degrees, a toric lens resting on the eye with a misalignment of more than 5 degrees from the required prescribed cylinder axis is usually adjusted by selecting the next cylinder axis to reduce the axis error to below 5 degrees. Therefore, considering the case where the lens is misaligned by 10 degrees is very conservative, as this never occurs with a lens that is properly fitted to the patient.

[0050] In one embodiment, the stabilization zone of Lens #3 was designed so that the anterior surface in the active area better matches the cumulative topographical slope calculated for 100 human eye pairs. Specifically, the cumulative distribution of topographical slopes below 45 degrees in the active area represents a higher percentage of the cumulative distribution of topographical slopes of Lens #1 (Table 2 below). In other words, the higher the cumulative distribution of topographical slopes below 45 degrees, the larger the area in the active area that matches the corneal slope. In a second embodiment, the stabilization zone of Lens #2 was designed so that the anterior surface in the active area does not match the cumulative topographical slope, and the cumulative distribution of topographical slopes below 45 degrees in the active area represents a lower percentage of the cumulative distribution of topographical slopes of Lens #1.

[0051] It should be apparent to those familiar with toric soft contact lenses that the threshold angle may vary based on the population of eyes for which the lenses are designed. In a proposed embodiment, the threshold angle is based on a mixed population of eyes. The threshold angle may also be ethnicity specific or other type of criteria when the toric soft contact lenses are designed for a particular type of eye.

[0052] [Table 2]

[0053] The average angular response obtained for Lens #3 over the 3.0 minutes of lens reorientation closely matches that of Lens #1, with better lens angular stability, provided the standard deviation is smaller. The average angular response obtained for Lens #2 over the 3 minutes of lens reorientation still matches that of Lens #1, but with worse lens angular stability, provided the standard deviation is larger.

[0054] Figure 12 displays the standard deviation for each lens for different lens misalignments ranging from 0 to 10 degrees nasally for the cumulative distribution of topographical slope in the active area below 45 degrees. Figure 12 shows that toric lenses with anterior topographical slopes with a cumulative distribution greater than 38% provide better angular stability than toric lenses with a cumulative distribution of topographical slope below 38%. Preferably, the cumulative distribution should be greater than 48%.

[0055] While what has been shown and described is believed to be the most practical and preferred embodiment, it will be apparent that variations from the specific designs and methods described and illustrated will themselves be obvious to those skilled in the art and may be used without departing from the spirit and scope of the invention. The present invention is not limited to the specific constructions described and exemplified, but should be constructed consistent with all modifications that may fall within the scope of the appended claims.

[0056] [Embodiment] (1) An ophthalmic lens, A first surface; a second surface disposed opposite the first surface, the second surface configured to abut at least a portion of an eye of the wearer; and a lens stabilization zone disposed adjacent to the first surface, at least a contour of the lens stabilization zone configured to minimize a recovery time for the Ophthalmic Lens to orient from a misaligned position to a rest position; Equipped with Eye lenses. (2) The ophthalmic lens of embodiment 1, wherein the ophthalmic lens has a generally round shape. (3) The ophthalmic lens of embodiment 1, wherein the ophthalmic lens has a non-round shape. (4) The ophthalmic lens of embodiment 1, further comprising a second lens stabilization zone disposed adjacent to the first surface. (5) An ophthalmic lens as described in 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 from a displaced position to a rest position upon interaction with at least one eyelid of the wearer.

[0057] (6) An ophthalmic lens as described in embodiment 4, wherein the lens stabilization zone is symmetrical about the sagittal plane. (7) An ophthalmic lens according to embodiment 4, wherein the lens stabilization zone is symmetrical about a tangential plane. (8) An ophthalmic lens as described in embodiment 4, wherein the lens stabilization zone is symmetrical with respect to the sagittal and tangential planes. (9) An ophthalmic lens as described in embodiment 4, wherein the lens stabilization zone is not symmetrical about the sagittal plane. (10) An ophthalmic lens as described in embodiment 4, wherein the lens stabilization zone is not symmetrical about the tangential plane.

[0058] (11) The ophthalmic lens of embodiment 4, wherein the lens stabilization zone is not symmetrical with respect to the sagittal and tangential planes. (12) An ophthalmic lens as described in embodiment 1, wherein the lens stabilization zone is positioned at least partially within an active area of ​​the lens based on expected interaction with the at least one eyelid of the wearer. (13) The ophthalmic lens of embodiment 12, wherein the predicted interaction with the at least one eyelid of the wearer is based on the individual eye shape of the intended wearer. (14) The ophthalmic lens of embodiment 12, wherein the predicted interaction with the at least one eyelid of the wearer is based on a plurality of sample eyes. (15) The ophthalmic lens of embodiment 12, wherein the predicted interaction with the at least one eyelid of the wearer is based on one or more eyelid profiles.

[0059] (16) An ophthalmic lens as described in embodiment 15, wherein the one or more eyelid profiles have a Cartesian coordinate system with 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 pupil center and the edge of the upper / lower eyelid at the primary gaze, 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 the origin of the Cartesian coordinate system at the center of the pupil. (17) An ophthalmic lens as described in embodiment 12, wherein the predicted interaction with the at least one eyelid of the wearer is based on the at least one eyelid in a given gaze direction. (18) The ophthalmic lens of claim 1, wherein the recovery time is less than 2 minutes for a 45 degree misalignment. (19) The ophthalmic lens of claim 1, wherein the misaligned position is greater than 5 degrees measured in angle from the horizontal axis. (20) The ophthalmic lens of claim 1, wherein the misaligned position is greater than 10 degrees measured in angle from the horizontal axis.

[0060] (21) A method for producing the ophthalmic lens according to embodiment 1. (22) An ophthalmic lens, A first surface; a second surface disposed opposite the first surface, the second surface configured to abut at least a portion of an eye of the wearer; and an active area disposed adjacent the first surface, at least a contour of the active area configured based on a distribution of terrain slope of one or more eyes of a subject; Equipped with Eye lenses. (23) The ophthalmic lens of embodiment 22, wherein the contour has a cumulative topographical slope. (24) The ophthalmic lens of embodiment 22, wherein the contour is configured to interact with only the upper eyelid or only the lower eyelid. (25) The ophthalmic lens of embodiment 22, wherein the ophthalmic lens has a generally round shape.

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

[0062] (31) The ophthalmic lens of embodiment 27, wherein the active area is symmetrical about the sagittal and tangential planes. (32) The ophthalmic lens of embodiment 27, wherein the active area is not symmetrical about the sagittal plane. (33) The ophthalmic lens of embodiment 27, wherein the active area is not symmetrical about a tangential plane. (34) The ophthalmic lens of embodiment 27, wherein the active area is not symmetrical with respect to the sagittal and tangential planes. (35) The ophthalmic lens of embodiment 22, wherein the active area is configured based on an expected interaction with the at least one eyelid of the wearer.

[0063] (36) An ophthalmic lens as described in embodiment 35, wherein the predicted interaction with the at least one eyelid of the wearer is based on the individual eye shape of the intended wearer. (37) The ophthalmic lens of embodiment 35, wherein the predicted interaction with the at least one eyelid of the wearer is based on a plurality of sample eyes. (38) The ophthalmic lens of embodiment 35, wherein the predicted interaction with the at least one eyelid of the wearer is based on one or more eyelid profiles. (39) An ophthalmic lens as described in embodiment 38, wherein the one or more eyelid profiles have a Cartesian coordinate system with 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 pupil center and the edge of the upper / lower eyelid at the primary gaze, 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 the origin of the Cartesian coordinate system at the center of the pupil. (40) An ophthalmic lens as described in embodiment 35, wherein the predicted interaction with the at least one eyelid of the wearer is based on the at least one eyelid in a given gaze direction.

[0064] (41) The ophthalmic lens of embodiment 22, wherein at least a contour of the active area is configured to minimize a recovery time for the ophthalmic lens to orient from a displaced position to a rest position. (42) The ophthalmic lens of embodiment 41, wherein the recovery time is less than 2 minutes for a 45 degree misalignment. (43) The ophthalmic lens of embodiment 41, wherein the misaligned position is greater than 5 degrees measured in angle from the horizontal axis. (44) An ophthalmic lens as described in embodiment 41, wherein the misaligned position is greater than 10 degrees measured in angle from the horizontal axis. (45) A method for producing the ophthalmic lens described in embodiment 22.

Claims

[Claim 1] 1. A method for designing a toric contact lens, comprising: The toric contact lens is A first surface; and a second surface disposed opposite the first surface, the second surface being configured to abut at least a portion of an eye of a wearer; and a lens stabilization zone including an active area having a steepest slope therein; The method for designing a toric contact lens comprises: at least a contour of the lens stabilization zone is configured to return the toric contact lens to a proper rotational position upon interaction with the at least one eyelid of the wearer when the toric contact lens is in a misaligned rotational position, and the steepest slope is between 25 degrees and 45 degrees. How to design toric contact lenses.

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