Invertible lens and method of design

Abstract

To provide a soft contact lens for fitting to an eye of a wearer in either a normal or inside-out orientation.SOLUTION: An ophthalmic lens may comprise a main body having a first surface and a second surface opposite the first surface. The main body has a diameter, base curve, peripheral thickness, and center thickness, where one or more of the diameter, base curve, peripheral thickness, and center thickness are configured such that a dsag is less than 1.3% when comparing a first orientation of the main body with at least a portion of the first surface abutting an eye of a wearer and a second orientation of the main body with at least a portion of the second surface abutting the eye of the wearer.SELECTED DRAWING: Figure 3A

Description

[Technical field]

[0001] FIELD OF THE DISCLOSURE The present disclosure relates to ophthalmic devices such as wearable lenses, including soft contact lenses, and more particularly to evertable ophthalmic devices and methods for designing evertable ophthalmic devices. [Background technology]

[0002] Current contact lens designs are intended to conform to one orientation, and thus the disparity between the cardinal orientation (e.g., having a defined inner surface for contact with the eye) and the inside-out orientation is maximized to prevent confusion between correct and incorrect orientations during insertion / placement on the eye. Thus, when the lens is inserted inside-out, the fit, vision, and comfort of the lens are adversely affected.

[0003] EP 1364248B1 describes a soft contact lens for fitting to a wearer's eye in either a normal orientation or an inside-out orientation, where in the normal orientation a front convex surface and a rear concave surface are provided, and in the inside-out orientation the normal front convex surface is transformed into a rear concave surface and the normal rear concave surface is transformed into a convex front surface. According to EP 1364248B1, the transformation is brought about by bending of the lens, which is addressed by at least one formation resulting in an adjustment to the surface contour of either the first or second surface. According to EP 1364248B1, the natural resistance to "turning inside out" and the resulting abstract and uncontrolled curvature change can be reduced or eliminated by a relief area placed in the lens. Summary of the Invention [Problem to be solved by the invention]

[0004] However, improvements are needed. [Means for solving the problem]

[0005] The present disclosure relates to invertible ophthalmic lenses and methods for designing and optimizing such ophthalmic lenses, for example, by in silico performance analysis and prototyping. As an example, the peripheral region of the lens can be designed to minimize the disparity in base curve and diameter between the base and everted orientations. The effect of the peripheral thickness on this disparity depends on the lens diameter, base curve, and central thickness, which must be optimized together with the peripheral thickness to obtain the best performance. If the base curve and diameter of the lens are comparable between the base and everted orientations, the fit on the eye and the visual performance are expected to be comparable.

[0006] The base curve and diameter of the lens may be identified as determining factors of inversion fit. According to the present disclosure, one or more of the base curve and diameter of the lens may be configured between the base orientation and the everted orientation. Thus, the peripheral region of the lens may be designed such that the deviation in diameter or sag (dDiam or dSag) between the base orientation and the everted orientation is minimized. Furthermore, the effect of the peripheral thickness may depend on the diameter, base curve, and center thickness of the lens. One or more of the diameter, base curve, and center thickness of the lens may be optimized for best performance.

[0007] Printing on a lens design that can be reversed can result in interchangeable (e.g., reversible) cosmetic appearances on the eye. This effect may include one or more changes in color, pattern, or effect. The resulting interchangeable cosmetic appearances may be customized based on print sequence, design / pattern, color, pattern placement, opacity level, and the like.

[0008] An ophthalmic lens may comprise a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a peripheral thickness, and a central thickness, and one or more of the diameter, base curve, peripheral thickness, or central thickness are configured such that a dsag is less than 1.3% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye.

[0009] An ophthalmic lens may comprise a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a thickness profile, and an edge profile, wherein the edge profile and one or more of the diameter, base curve, or thickness profile are configured such that when the lens is in an inverted orientation in which at least a portion of the second surface abuts the wearer's eye, the apex height measured from the edge apex to the surface nearest the eye is 0.020 mm or less.

[0010] A method for making an ophthalmic lens is disclosed. [Brief description of the drawings]

[0011] The above and other features and advantages of the present disclosure will become apparent from the following more particular description of preferred embodiments of the present disclosure, as illustrated in the accompanying drawings. [Figure 1A] 1 is a schematic diagram of a soft contact lens in a basic orientation as well as its wrapped configuration. [Figure 1B] 1 is a schematic diagram of an inverted soft contact lens (eg, inside-out) and its wrap configuration. [Figure 2A] 2A and 2B show distortion modeling of a conventional soft contact lens in a base orientation (FIG. 2A) and an inverted or inside-out orientation (FIG. 2B). [Figure 2B] 2A and 2B show distortion modeling of a conventional soft contact lens in a base orientation (FIG. 2A) and an inverted or inside-out orientation (FIG. 2B). [Figure 3A]3A-3B show distortion modeling of a soft contact lens (eg, peripheral thickness optimized) according to the present disclosure, where the lens is in a home orientation (FIG. 3A) and an inverted or inside-out orientation (FIG. 3B). [Figure 3B] 3A-3B show distortion modeling of a soft contact lens (eg, peripheral thickness optimized) according to the present disclosure, where the lens is in a home orientation (FIG. 3A) and an inverted or inside-out orientation (FIG. 3B). [Figure 4A] A list of the survey ratings of 14 subjects is shown. [Figure 4B] A list of the survey ratings of 14 subjects is shown. [Diagram 5] 13 shows a plot depicting the relationship between simulated dsag and survey scores regarding the ease of determining that a lens is inside-out. [Figure 6] A plot showing the resulting design space of diameters, base curves, and CTs, as well as their effect on the simulation metric dSag, as a function of marker size (e.g., diameter of a circular marker), is shown. [Figure 7] 1 shows a model of the peripheral edge of a conventional contact lens wrapped in a cardinal orientation. [Figure 8] 1 shows a model of the peripheral edge of a conventional contact lens wrapped in an inverted or inside-out orientation. [Figure 9] 1 shows a model of the peripheral edge of a contact lens according to the present disclosure wrapped in a cardinal orientation. [Figure 10] 1 shows a model of the peripheral edge of a contact lens according to the present disclosure wrapped in an inverted or inside-out orientation. [Figure 11A] 1 shows plots based on optical analysis of a 0.00D lens in both a base orientation and a reversed or inside-out orientation. [Figure 11B] 1 shows plots based on optical analysis of a 0.00D lens in both a base orientation and a reversed or inside-out orientation. [Figure 11C] 1 shows plots based on optical analysis of a 0.00D lens in both a base orientation and a reversed or inside-out orientation. [Figure 11D] 1 shows plots based on optical analysis of a 0.00D lens in both a base orientation and a reversed or inside-out orientation. [Figure 12A] 1 shows plots based on optical analysis of a -4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 12B] 1 shows plots based on optical analysis of a -4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 12C] 1 shows plots based on optical analysis of a -4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 12D] 1 shows plots based on optical analysis of a -4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 13A] 1 shows plots based on optical analysis of a +4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 13B] 1 shows plots based on optical analysis of a +4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 13C] 1 shows plots based on optical analysis of a +4.00D lens in both the base orientation and the inverted or inside-out orientation. [Figure 13D] 1 shows plots based on optical analysis of a +4.00D lens in both the base orientation and the inverted or inside-out orientation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Soft contact lenses may be designed with a base curve(s) configured to fit the lens to the corneal / scleral profile of the wearer's eye, a diameter that is generally larger than the corneal diameter, and a front curve(s) that provides the refractive function of the lens. Soft contact lenses, by function, may be made from soft materials so that they can conform to the corneal / scleral profile and "wrap" onto the eye (FIG. 1A). This wrapping or deformation of the lens from an inverted state may have a significant refractive effect on the eye as the curve of the contact lens changes to accommodate the corneal and scleral profile. When the lens is inverted, the anterior surface becomes the posterior surface that touches the ocular surface when the inverted lens wraps around the eye (FIG. 1B). Furthermore, the effect of wrapping on the refractive power of the lens may also depend on whether the lens is applied to the eye in a base orientation or an inverted / inverted orientation.

[0013] According to the present disclosure, the behavior of the lens in various orientations can be modeled (e.g., using finite element analysis (FEA), MSC Marc software, etc.) to simulate lens inversion, lens wrapping on the eye, and lens handling, e.g., placement of the lens on the eye using fingers or tools. For example, Figures 2A-2B show distortion modeling of a conventional soft contact lens in a base orientation (Figure 2A) where no distortion is assumed, and in an inverted or inside-out orientation (Figure 2B) with residual distortion after forcibly deflecting the lens. When a lens using a standard design is inverted, the peripheral thickness becomes the resistance to deformation, resulting in residual distortion of the lens in the inverted configuration. This corresponds to the lens edge spreading out, thus increasing the diameter (reducing sag), and ultimately resulting in different fitting characteristics on the eye when placed on the eye. Indeed, according to current practice by soft contact lens wearers, the greater the dissimilarity between the base and inverted configurations, the easier it is to recognize whether the lens is inverted or not by visual inspection. 3A-3B show distortion modeling of a soft contact lens (e.g., with reduced peripheral thickness) according to the present disclosure, where the lens is in a home orientation (FIG. 3A) and an inverted or inside-out orientation (FIG. 3B). By managing (e.g., reducing, minimizing, etc.) the peripheral thickness, the primary resistance to inversion of the lens is reduced, and thus the lens diameter and sag are closer to their originally intended values ​​in the home configuration (before inversion), i.e., the deviation in diameter or sag (dDiam or dSag) between the home and inside-out orientations is minimized.

[0014] A potential disadvantage of reducing the peripheral thickness is increased difficulty in handling the lens (e.g., flimsiness and folding). Several design alternatives were generated by the present disclosure and manufactured for evaluation. In one embodiment, a survey of 14 subjects was conducted based on two metrics / questions: 1) assessing the ease of determining that the lens is inside-out, and 2) assessing the ease of handling the lens for each of five sample lenses. The five lenses included one control lens and four test lenses of various variations of the proposed design, each having a given diameter (D), base curve (BC), and center thickness (CT) in millimeters (mm), as follows: Control: D14.2, BC8.5, CT0.085 Design 403: D14.3, BC8.1, CT0.1 Design 404: D14.3, BC8.1, CT0.2 Design 405: D14.3, BC8.3, CT0.1 Design 406: D14.3, BC8.5, CT0.1

[0015] 4A and 4B show a list of the survey ratings of the 14 subjects, with each rating being as follows: 1=Very difficult 2=Somewhat difficult 3=Somewhat easy 4=Very easy

[0016] Table 1 shows the mean scores from the survey on inside-out discrimination and handling.

[0017] [Table 1]

[0018] According to Table 1 and subjective feedback, design 405 appears to behave optimally in both respects, i.e., it is easy to handle and at the same time appears to be more difficult to determine if it is inside-out. Figure 5 shows a plot depicting the relationship between simulated dsag (deviation of sag after inversion) and survey scores on the ease of determining whether a lens is inside-out or not. This plot shows that simulated dsag can be used as a predictor of the inside-out discrimination score.

[0019] To further explore the range of applicable design parameters, design 405 was selected as the optimal design and variation ranges of diameter, base curve and center thickness were proposed for further evaluation, as shown in Table 2.

[0020] [Table 2]

[0021] Within the parameter ranges above (represented by Table 2), in addition to the original 18 designs, 27 more design combinations were generated and evaluated for inversion simulation, resulting in a total of 45 design variations. Figure 6 shows a plot illustrating the resulting design space of diameter, base curve, and CT, and their effect on the simulation metric dSag as a function of marker size (e.g., diameter of a circular marker). The smaller the dSag, the more difficult it is to determine inversion and the better the performance.

[0022] Based on the data in Table 1 and the relationship between the simulation metric dSag and the ease of inside-out discrimination (FIG. 5), the preferred dSag and the limit values ​​of the acceptable dSag can be estimated as follows: Ease of identifying inside-out is preferable <1.2% <==> dSag <1% is preferable Ease of identifying inside-out: <2% is acceptable <==> dSag <1.3% is acceptable

[0023] The terms "preferred" and "acceptable" are used herein to distinguish exemplary performance levels and are not intended to indicate a preferred or best embodiment. Other performance ranges may be used. These limits on the simulation metric dSag allow us to identify preferred designs (Table 3) and acceptable designs (Table 4) from the 45 designs that fall within the ranges shown in Table 2, as follows:

[0024] [Table 3]

[0025] [Table 4]

[0026] Material properties (e.g., modulus of elasticity measured using ANSI Z80.20) can affect the mechanical behavior of the lens. To study the effect of material properties, modulus of elasticity was varied between 150 kpa and 660 kpa. To evaluate metrics for handling and inside-out inversion (I / O) discrimination, inversion and handling simulations were repeated and the results are shown in Table 5.

[0027] [Table 5]

[0028] The data in Table 5 indicates that increasing the modulus of elasticity can improve the handling of reversible lenses without affecting the inverted shape of the lens, which is a desirable result.

[0029] In contact lenses, the peripheral edge of the lens can affect the overall comfort. For example, FIG. 7 shows a model of the peripheral edge of a conventional contact lens wrapped in a basic orientation. As shown, the edge wraps in a manner that is usually comfortable for the wearer when the lens edge is in full contact with the eye. For comparison, FIG. 8 shows a model of the peripheral edge of a conventional contact lens wrapped in an inverted or inside-out orientation. As shown, the peripheral edge wraps in a different manner than the wearer's eye, and there is a gap between the edge apex and the eye surface, which can be uncomfortable for the wearer as the eyelid repeatedly moves from the eye surface to the contact lens during blinking.

[0030] However, according to the present disclosure, with an edge profile that is symmetrical or substantially similar on both sides of the lens, the difference in ocular comfort between the two orientations can be minimized. Additionally or alternatively, the existing gap between the edge apex and the ocular surface (i.e., apex height) can be reduced in either orientation. For example, Figure 9 shows a model of the peripheral edge of a contact lens according to the present disclosure wrapped in a base orientation. For comparison, Figure 10 shows a model of the peripheral edge of a contact lens according to the present disclosure wrapped in an inverted or inside-out orientation.

[0031] As an ophthalmic medical device that provides vision correction, an invertible soft contact lens should provide equivalent power correction using either orientation. Given the incompressible nature of the soft contact lens material and the fact that the lens wraps around the eye when placed on the eye on either side, it can be assumed that the optical zone of the contact lens will deform to a similar curvature or shape on the eye when placed in either orientation. With the lens design according to the present disclosure, preliminary opto-mechanical simulations are performed in both base and inverted orientations. The analysis is repeated for designs with different powers (-4.00D, 0.00D, +4.00D). Optical analysis is performed assuming both unwrapped and wrapped lens shapes (estimated by FEA). Figures 11A-11D show plots based on the optical analysis of a 0.00D lens in both base and inverted or inside-out orientations. The plots shown in Figures 11A-11D compare the lens profiles with their calculated power profiles. These show that there is minimal difference in lens power (within the optical zone of r<4mm) between the base and inside-out orientations (Figures 11A-B). Notably, once the lenses are wrapped around the eye, the differences between the power profiles disappear as the geometries become equivalent (Figures 11C-D).

[0032] 12A-12D show plots based on optical analysis of -4.00D lenses in both base and inverted or inside-out orientations. These plots compare the lens profiles with their calculated power profiles. They show that there is minimal difference between the two sides (FIGS. 12A-12B). Notably, once the lenses are wrapped around the eye, the differences between the power profiles disappear as the geometries become equivalent (FIGS. 12C-12D).

[0033] 13A-13D show plots based on optical analysis of +4.00D lenses in both base and inverted or inside-out orientations. These plots compare the lens profiles with their calculated power profiles. They show minimal differences between the two sides (FIGS. 13A-13B). Notably, once the lenses are wrapped around the eye, the differences between the power profiles disappear as the geometries become equivalent (FIGS. 13C-13D).

[0034] These opto-mechanical simulations support the concept that visual acuity with invertible lens designs according to the present disclosure can be independent of lens orientation.

[0035] As described herein, the peripheral region of the lens can be designed to minimize the disparity in base curve and diameter between the base and everted orientations. The effect of the peripheral thickness on this disparity depends on the lens diameter, base curve, and center thickness, which must be optimized together with the peripheral thickness to obtain the best performance. If the base curve and diameter of the lens are comparable between the base and everted orientations, the fit on the eye and visual performance are expected to be comparable.

[0036] Additionally, printing on a lens design that can be reversed can result in interchangeable (e.g., reversible) cosmetic appearances on the eye. This effect may include one or more changes in color, pattern, or effect. The resulting interchangeable cosmetic appearances may be customized based on print sequence, design / pattern, color, pattern placement, opacity level, and the like.

[0037] 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.

[0038] [Embodiment] (1) An ophthalmic lens, a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a peripheral thickness, and a central thickness; An ophthalmic lens, wherein one or more of the diameter, the base curve, the peripheral thickness, or the central thickness are configured such that a dsag is less than 1.3% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (2) An ophthalmic lens as described in embodiment 1, wherein one or more of the diameter, base curve, peripheral thickness, or central thickness are configured such that a dsag is less than 1.2% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (3) An ophthalmic lens as described in embodiment 1, wherein one or more of the diameter, base curve, peripheral thickness, or central thickness are configured such that a dsag is less than 1.1% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (4) An ophthalmic lens as described in embodiment 1, wherein one or more of the diameter, base curve, peripheral thickness, or central thickness are configured such that a dsag is less than 1.0% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (5) The ophthalmic lens of claim 1, wherein the body exhibits a modulus of elasticity of from 150 kPa to 1000 kPa, as measured according to ANSI Z80.20.

[0039] (6) The ophthalmic lens of claim 1, wherein the body exhibits a modulus of elasticity of from 270 kPa to 1000 kPa, as measured according to ANSI Z80.20. (7) The ophthalmic lens of claim 1, wherein the body exhibits a modulus of elasticity of from 420 kPa to 1000 kPa, as measured according to ANSI Z80.20. (8) The ophthalmic lens according to embodiment 1, wherein the diameter of the body is between 13.8 mm and 15 mm. (9) The ophthalmic lens of embodiment 1, wherein the diameter of the body is 14.3 mm to 14.8 mm. (10) The ophthalmic lens according to embodiment 1, wherein the base curve of the body is 8 mm to 8.6 mm.

[0040] (11) The ophthalmic lens according to embodiment 1, wherein the base curve of the body is 8 mm to 8.3 mm. (12) The ophthalmic lens according to embodiment 1, wherein the base curve of the body is 8 mm to 8.1 mm. (13) The ophthalmic lens of embodiment 1, wherein the center thickness of the body is between 0.06 mm and 0.2 mm. (14) The ophthalmic lens of embodiment 1, wherein the center thickness of the body is between 0.1 mm and 0.2 mm. (15) A method for producing the ophthalmic lens according to embodiment 1.

[0041] (16) An ophthalmic lens, a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a thickness profile, and an edge profile; An ophthalmic lens, wherein the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured such that when the lens is in an inverted orientation in which at least a portion of the second surface abuts the wearer's eye, the apex height, measured from the edge apex to the surface closest to the eye, is 0.020 mm or less. (17) An ophthalmic lens as described in embodiment 16, wherein the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured such that a dsag is less than 1.2% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (18) An ophthalmic lens as described in embodiment 16, wherein the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured such that a dsag is less than 1.1% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (19) An ophthalmic lens as described in embodiment 16, wherein the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured such that a dsag is less than 1.0% when comparing a first orientation of the body in which at least a portion of the first surface abuts the wearer's eye with a second orientation of the body in which at least a portion of the second surface abuts the wearer's eye. (20) The ophthalmic lens of embodiment 16, wherein the body exhibits a modulus of elasticity of from 150 kPa to 1000 kPa, as measured according to ANSI Z80.20.

[0042] (21) The ophthalmic lens of embodiment 16, wherein the body exhibits a modulus of elasticity of from 270 kPa to 1000 kPa, as measured according to ANSI Z80.20. (22) The ophthalmic lens of embodiment 16, wherein the body exhibits a modulus of elasticity of from 420 kPa to 1000 kPa, as measured according to ANSI Z80.20. (23) The ophthalmic lens of embodiment 16, wherein the diameter of the body is 13.8 mm to 15 mm. (24) The ophthalmic lens of embodiment 16, wherein the diameter of the body is 14.3 mm to 14.8 mm. (25) The ophthalmic lens according to embodiment 16, wherein the base curve of the body is 8 mm to 8.6 mm.

[0043] (26) The ophthalmic lens according to embodiment 16, wherein the base curve of the body is 8 mm to 8.3 mm. (27) The ophthalmic lens according to embodiment 16, wherein the base curve of the body is 8 mm to 8.1 mm. (28) The ophthalmic lens of embodiment 16, wherein the center thickness of the body is between 0.06 mm and 0.2 mm. (29) The ophthalmic lens of embodiment 16, wherein the center thickness of the body is between 0.1 mm and 0.2 mm. (30) A method for producing the ophthalmic lens described in embodiment 16.

Claims

1. A contact lens for placement on a wearer's eye, comprising: a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a peripheral thickness, a central thickness, and a predetermined spherical power to provide corrected vision when worn on the eye of the wearer; one or more of the diameter, the base curve, the peripheral thickness, or the central thickness are configured to provide a dsag of less than 1.3% when comparing a first orientation of the body in which at least a portion of the first surface abuts the eye of the wearer to a second orientation of the body in which at least a portion of the second surface abuts the eye of the wearer; 1. A contact lens adapted to be invertible such that when either the first surface or the second surface is in contact with the eye of the wearer, the geometry of the contact lens is equivalent and differences between power profiles disappear to provide the corrected vision.

2. 2. The contact lens of claim 1, wherein one or more of the diameter, the base curve, the peripheral thickness, or the central thickness are configured such that a dsag is at least one of less than 1.2%, less than 1.1%, or less than 1.0% when comparing a first orientation of the body in which at least a portion of the first surface abuts the eye of the wearer to a second orientation of the body in which at least a portion of the second surface abuts the eye of the wearer.

3. 2. The contact lens of claim 1, wherein the body exhibits a modulus of elasticity, as measured in accordance with ANSI Z80.20, of at least one of 150 kPa to 1000 kPa, 270 kPa to 1000 kPa, and 420 kPa to 1000 kPa.

4. The contact lens of claim 1 , wherein the diameter of the body is at least one of 13.8 mm to 15 mm and 14.3 mm to 14.8 mm.

5. The contact lens of claim 1 , wherein the base curve of the body is at least one of 8 mm to 8.6 mm, 8 mm to 8.3 mm, and 8 mm to 8.1 mm.

6. The contact lens of claim 1 , wherein the center thickness of the body is at least one of 0.06 mm to 0.2 mm and 0.1 mm to 0.2 mm.

7. A contact lens for placement on a wearer's eye, comprising: a body having a first surface and a second surface opposite the first surface, the body having a diameter, a base curve, a thickness profile, an edge profile, and a predetermined spherical power that provides corrected vision when worn on the eye of the wearer; the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured such that when the contact lens is in an inverted orientation in which at least a portion of the second surface abuts the eye of the wearer, an apex height measured from an edge apex to a surface nearest the eye is 0.020 mm or less; 1. A contact lens adapted to be invertible such that when either the first surface or the second surface is in contact with the eye of the wearer, the geometry of the contact lens is equivalent and differences between power profiles disappear to provide the corrected vision.

8. 8. The contact lens of claim 7, wherein the edge profile and one or more of the diameter, the base curve, or the thickness profile are configured to provide a dsag of at least one of less than 1.2%, less than 1.1%, or less than 1.0% when comparing a first orientation of the body in which at least a portion of the first surface abuts the eye of the wearer to a second orientation of the body in which at least a portion of the second surface abuts the eye of the wearer.

9. 8. The contact lens of claim 7, wherein the body exhibits a modulus of elasticity, as measured in accordance with ANSI Z80.20, of at least one of 150 kPa to 1000 kPa, 270 kPa to 1000 kPa, and 420 kPa to 1000 kPa.

10. The contact lens of claim 7, wherein the diameter of the body is at least one of 13.8 mm to 15 mm and 14.3 mm to 14.8 mm.

11. The contact lens of claim 7, wherein the base curve of the body is at least one of 8 mm to 8.6 mm, 8 mm to 8.3 mm, and 8 mm to 8.1 mm.

12. The contact lens of claim 7, wherein the center thickness of the body is at least one of 0.06 mm to 0.2 mm and 0.1 mm to 0.2 mm.

13. The contact lens of claim 1 , wherein the body has an edge profile, the edge profile being symmetrical on both sides of the contact lens.

14. The contact lens of claim 7 , wherein the edge profile is symmetrical on both sides of the contact lens.

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