Apparatus and method for packaging contact lenses

Abstract

A contact lens package includes a blister package defining a cavity, a contact lens disposed in the cavity in an unstressed state, a lens hydration solution partially filling the cavity, and a lidstock sealed to the blister package, wherein a segment of the lidstock combined with the cavity forms an enclosure for the lens and the liquid. The segment has an inner surface including at least one relief element. The inner surface is flat except for the at least one relief element. A gap is disposed between a top surface of the lens hydration solution and at least a portion of the inner surface. The at least one relief element on the inner surface of the lidstock may be formed when inspecting the structure for leaks by applying pressure to the lidstock with a stamp having a profile corresponding to the at least one relief element.

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for packaging contact lenses. [Background technology]

[0002] Packaging, shipping, and storing contact lenses involves holding the contact lens (also referred to herein simply as the lens) within the cavity of a blister package.

[0003] Typically, the lens is first placed into the cavity of an empty blister package. After the lens is placed in the cavity, the package is transported to one or more stations where the lens and lens package are further processed (e.g., inspected, moistened with saline or another suitable liquid, heat-sealed to the cavity with a lidding material (e.g., conventional multi-layer packaging foil), labeled, leak-tested, and sterilized (e.g., by autoclaving)).

[0004] During transport, the lenses and packaging are typically subjected to forces encountered by the lenses and packaging during movement between stations on the conveyor, such as substantial acceleration and deceleration, movement around bends, inversion, vibration, and / or movement between conveyors by pick and place machinery.

[0005] Movement of blister packages with lenses and hydration solution disposed within the cavities prior to heat sealing presents quality risks as well as risks to packaging machinery. For example, movement could result in liquid being deposited on the surface of the package where the heat seal is formed, or liquid could exit the cavity onto the conveyor or onto machinery at one or more of the stations.

[0006] An additional quality risk is associated with keeping the lenses in the package after the packaging process is complete: the lenses may spend a significant amount of time (months or even years) in the package while they are stored by the manufacturer or distributor, transported for retail sale, and / or stored by the consumer after retail sale.

[0007] During shipping and storage, lenses can be held in various orientations within the package. When a lens package is held in a particular orientation (e.g., upside down—with the lid under the lens), interactions between the lens and the lid (e.g., the lens adhered to the lid by a suction cup) are known to at least temporarily affect the optical properties of the lens. In some cases, lens adherence can be exacerbated by forces exerted on the lens by air bubbles present in the cavity after the addition of hydration solution and heat sealing. Figure 1 is a schematic diagram of an upside-down contact lens package 10, in which the adhesion of a lens 50 to a foil lid 30 is affected by forces exerted on the lens by air bubbles B present in a cavity C (also called a "well") of a blister package 15. Typically, the contact lens package 10 is placed in secondary packaging (e.g., a carton) for sale.

[0008] In U.S. Patent No. 5,949,999 (hereinafter referred to as Barre), it was proposed to reduce the headspace (i.e., air gap) between the top of the saline solution and the lid material to limit the ability of the lens to fold within the lens package. To reduce the headspace and the resulting bubble size, Barre teaches that the foil covering the packaging cavity is concave across the entire width of the cavity, so that the foil protrudes into the cavity; Barre further teaches that an embossed pattern can be added to the concave foil to limit adhesion of the lens to the foil. To further reduce the headspace and bubble size, Barre teaches increasing the saline level in the cavity. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] U.S. Patent No. 10,368,621 Summary of the Invention [Problem to be solved by the invention]

[0010] Ideally, the package and packaging process maximizes in-process yield (e.g., as determined by seal inspection, leak detection) as well as lens performance (i.e., how the lens functions when placed on the wearer's eye). [Means for solving the problem]

[0011] According to an aspect of the present invention, in a contact lens package having a lid material for sealing a contact lens in a cavity of a blister package, the inner surface of the lid material includes at least one relief element, and the inner surface of the lid material excluding the at least one relief element is flat.

[0012] As explained in more detail below, the flat inner surface (excluding any relief elements) enhances the performance of the relief features in preventing or reducing the likelihood of adhesion / adsorption cupping of the lens to the lidstock, which can occur with embossed, concave lidstocks. The effectiveness of the flat inner surface in reducing adhesion allows for a reduction in the amount of liquid (e.g., saline) in the cavity; concomitantly, the reduced liquid along with the flat inner surface (excluding any relief elements) promotes the formation of a space between the top surface of the saline and at least a portion of the inner surface of the lidstock (when the package is properly oriented).

[0013] As a result of the reduced saline fill volume and the presence of an air gap above the upper surface of the liquid, the opportunity for interaction between the lidstock and the saline solution during the heat-sealing process is limited, and the space between at least a portion of the upper surface of the saline solution and the top of the cavity limits the possibility of saline solution escaping from the cavity prior to heat sealing; both reduce the possibility of quality issues associated with saline solution falling onto the surface of the package where the heat seal is formed or onto conveyors or machinery used in the packaging process. Additionally, saline solution is less likely to escape from the cavity when the package is opened by the lens wearer.

[0014] One aspect of the present invention relates to a contact lens package including a blister package defining a cavity, a contact lens disposed in the cavity in an unstressed state, and a lens hydration solution partially filling the cavity. A lidstock is sealed to the blister package, and a segment of the lidstock combined with the cavity forms an enclosure for the lens and lens hydration solution. The segment has an inner surface including at least one relief element; and the inner surface, excluding the at least one relief element, is flat. A gap is disposed between the upper surface of the lens hydration solution and at least a portion of the inner surface.

[0015] In some embodiments, the lens hydration solution fills at most 99% of the cavity volume.

[0016] At least one relief element may comprise a periodic structure. The structure may be periodic along a line extending through the center of the segment.

[0017] At least one relief element may comprise a non-periodic structure along a line extending through the center of the segment.

[0018] In some embodiments, at least one relief element consists of a single relief element.

[0019] The outer surface of the lidstock may be flat. The lidstock may include an innermost layer that is a plastic resin.

[0020] Another aspect of the present invention relates to a contact lens package including a blister package defining a cavity, a contact lens disposed in the cavity in an unstressed state, and a lens hydration solution partially filling the cavity. A lidstock is sealed to the blister package, and a segment of the lidstock combined with the cavity forms an enclosure for the lens and lens hydration solution. The segment has an inner surface including at least one dome-shaped relief element. The inner surface, excluding the at least one relief element, is flat.

[0021] In some embodiments, the lens hydration solution fills at most 99% of the cavity volume.

[0022] In some embodiments, at least one relief element comprises a periodic structure. The structure may be periodic along a line extending through the center of the segment.

[0023] In some embodiments, at least one relief element comprises a non-periodic structure along a line extending through the center of the segment.

[0024] Yet another aspect of the present invention relates to a method of making a contact lens package, the method comprising the steps of: (1) producing a structure including a blister package defining a cavity, a contact lens disposed in the cavity, a lens hydration solution partially filling the cavity, and a lidstock sealed to the blister package, wherein a segment of the lidstock in combination with the cavity forms an enclosure for the lens and lens hydration solution; and (2) inspecting the structure for leaks by applying pressure to the lidstock with a stamp having a profile corresponding to the at least one relief element, the pressure forming the at least one relief element on an interior surface of the lidstock.

[0025] As used herein, the term "relief element" refers to a feature formed on the inner surface of a lidstock, the feature having a height difference relative to the immediately surrounding portion of the lidstock, the feature having a shape with a height transition, such that a contact lens enclosed in a blister package cavity by the lidstock cannot or is unlikely to continuously adhere (i.e., conform) to the lidstock across the relief element. It will be understood that the ability of the lens to conform to the lidstock across the relief element is determined, at least in part, by the modulus of elasticity of the lens material, the lens edge design (thicker edges are less likely to conform), and the thickness of the lens profile. The relief element may be in the form of an indentation or a protuberance.

[0026] As used herein, the term "flat" means that the lidstock has not been treated to impart a contour (e.g., has no recesses extending substantially the entire distance between the opposing sides of the heat seal (i.e., has no indentations)). It will be understood that a lidstock that has not been treated to impart a contour (e.g., a conventional multilayer packaging foil) will typically have local deviations in its surface slope, and the heat-sealing process may result in local contours adjacent to the heat seal; despite these deviations, the lidstock may be "flat" or "substantially flat" across the blister package cavity. A flat lidstock is substantially horizontal between the opposing sides of the blister package to which the lidstock is adhered, except for artifacts of the heat-sealing process and any relief elements adjacent to the opposing sides.

[0027] The term "unstressed state" refers to a state of the lens in which the lens is not compressed by an opposing surface (e.g., an opposing surface of a package) and, as a result, the lens is flattened by the opposing surface beyond the lens shape determined by gravity and the liquid in which the lens is immersed.

[0028] The term "dome-shaped" refers to a shape that has a continuous curvature over an area. A dome-shaped surface forms a discontinuity where the dome-shaped surface meets a flat surface. For example, a dome-shaped surface can be formed from a portion of a sphere, spheroid, ellipsoid, or oval.

[0029] The term "cavity" includes any concave portion of the blister package where a contact lens nominally resides when the lens package is oriented (typically dome-shaped), but also includes any other rounded or angled portion of the blister package that is fluidly connected to the concave portion (see, e.g., portion E in Figure 1). The volume of the cavity is determined as the space enclosed by and below a plane extending between the surfaces to which the lidding material is attached.

[0030] These and other aspects of the present invention will become apparent upon review of the following detailed description and appended claims.

[0031] Exemplary non-limiting embodiments of the present invention are described by way of example with reference to the accompanying drawings, in which the same reference numerals are used to designate the same or similar components in different figures. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a cross-sectional side view schematic of an upside-down conventional contact lens package in which adhesion of the lens to the lidstock is exacerbated by forces exerted on the lens by air bubbles present in the cavity. [Figure 2A] 1 is a cross-sectional side schematic view of an example of a contact lens package according to an embodiment of the present invention; [Figure 2B] 2B is a schematic plan view of the inside of the lidstock of the lens package of FIG. 2A, shown separated from the rest of the package for ease of illustration; [Figure 3A] 1 is a plan view showing a schematic representation of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; FIG. [Figure 3B] 1 is a schematic side view of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; [Figure 3C] 1 is a plan view showing a schematic representation of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; FIG. [Figure 3D] 1 is a schematic side view of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; [Figure 3E] 1 is a plan view showing a schematic representation of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; FIG. [Figure 3F] 1 is a schematic side view of an example of a relief feature structure according to an embodiment of the present invention formed on a lid material that is flat except for the relief feature structure; DETAILED DESCRIPTION OF THE INVENTION

[0033] Aspects of the present invention will be further described with reference to the following specific examples, which are provided by way of illustration and are understood to be in no way limiting of the claimed invention.

[0034] Figure 2A is a cross-sectional side schematic view of an embodiment of a contact lens package 200 according to an embodiment of the present invention. Figure 2B is a schematic plan view of a lidstock 230 of the lens package 200. The contact lens package 200 includes a blister package 220 defining a cavity C. A contact lens 50 is disposed within the cavity C in an unstressed state, with a lens hydration solution 210 partially filling the cavity C. The cavity C has a spheroid-shaped portion within which the contact lens 50 is located.

[0035] The lidding material 230 is sealed to the blister package 220 at a landing L around the perimeter P, and a segment S of the lidding material combines with the cavity C to form an enclosure for the lens 50 and lens hydration solution 210. The segment S has an inner surface I that includes at least one relief element 232. Representative relief elements 232a-232g are shown in FIG. 2A. The inner surface I is flat, except for the at least one relief element 232 and a raised portion BU adjacent the perimeter P that results from the leak detection process (described below). That is, as shown in FIG. 2A, the inner surface I, except for the at least one relief element 232 and the raised portion BU that results from the leak detection process, is a substantially uniform distance from the bottom B of the cavity C to a plane tangent to the bottom B of the blister package (as measured perpendicular to the flat portion of surface I).

[0036] The lidstock 230 can be made from any conventional lidstock material for use with contact lenses, such as a conventional multi-layer packaging foil, in which relief elements can be formed. Such multi-layer foils typically have at least one layer of flexible metal (e.g., aluminum) and at least one layer of plastic resin. The innermost layer is typically plastic. The lens hydration solution 210 can be any conventional lens hydration solution (e.g., saline or purified water). The blister package 220 can be made from any conventional blister package for use with contact lenses. For example, the blister package can be made from polypropylene, polyethylene, polyvinyl chloride, or polystyrene.

[0037] A void 240 is disposed between the top surface TS of the lens hydration solution 210 and at least a portion of the inner surface. Typically, the lens hydration solution fills at most 99% of the cavity volume. In some embodiments, the lens hydration solution fills at most 98% of the cavity volume; in some embodiments, the lens hydration solution fills at most 95% of the cavity volume; in some embodiments, the lens hydration solution fills at most 90% of the cavity volume. It is understood that the shape of the void may be affected by at least water tension and adhesive forces from the foil and blister package, and in some embodiments, the void may appear as an air bubble. As discussed above, the presence of the void provides several quality-related benefits.

[0038] The presence of the at least one relief element on the inner surface of the lidstock prevents the lens from adhering to the lidstock; however, the flat configuration of the inner surface I (except for the at least one relief element 132) may increase the resistance of the lens to adhering to the inner surface of the lidstock, for example, because the lens is less likely to conform to a flat shape. Furthermore, as noted above, the flat configuration of the inner surface I (except for the at least one relief element 132) reduces lens adhesion, so less hydration solution may be provided in the lens package, thereby reducing the occurrence of quality and mechanical issues related to the lens hydration solution leaking out of the package during the packaging process.

[0039] 3A and 3B, the at least one relief element 332 comprises a repeating pattern of cylindrically shaped relief elements across the segment S, with the interior surface I of the segment S being flat except for the at least one relief element 332. Typically, the at least one relief element 332 is desirably sized and shaped with respect to the size of the segment S and the periphery of the packaged lens such that the at least one relief element does not allow continuous contact between the lidstock and the periphery of the packaged lens. In FIGS. 3A and 3B, it can be seen that the at least one relief element forms a periodic structure along a line D extending through the center CT of the segment S. In other embodiments including multiple relief elements, there is no line D extending through the center CT along which there is a repeating structure.

[0040] 3C and 3D, the at least one relief element consists of a single notch-shaped relief element 334 extending across the diameter of segment S, with the interior surface I of segment S being flat except for at least one relief element 334. Typically, it is desirable for the single relief element (e.g., relief element 334) across segment S to extend through or proximate to the center point of segment S, such that the relative sizes of segment S and the periphery of the packaged lens do not allow for continuous contact between the lidstock and the periphery of the lens.

[0041] In yet another example, as shown in Figures 3E and 3F, at least one relief element 336a-336f (collectively 336) does not include a repeating structural pattern, and the interior surface I of the lid material 337 is flat except for at least one relief element 336. The non-repeating structure 336 includes five spherical or spheroidal ridges 336a-336e formed in a circle and one spherical ridge 336f in the center of the circle. While Figures 3E and 3F show spherical relief elements, other dome-shaped ridges may also be used.

[0042] It will be appreciated that the discontinuities where the dome-shaped surface meets the flat sheet and the variations in height along the relief element help to reduce or prevent the possibility of adhesive cupping of the lens to the lidstock. A further advantage of dome-shaped relief elements over other shapes is that the formation of a surface with a continuous curvature, rather than a surface with discontinuities in the relief element, is less likely to damage the lidstock as a result of pressure applied during the formation of the relief element.

[0043] While the relief element examples shown in Figures 3A-3F have features at a scale large enough to be visible to the naked eye, it should be understood that at least one relief element may be present at a scale that is not visible to the naked eye.

[0044] For example, for use with typical silicone hydrogels (e.g., califilicon A), spherically shaped relief elements having a radius of curvature of about 4-6 mm and a diameter of about 4-6 mm can be used. In some examples, the relief elements have an overall height (with respect to the flat portion of the foil) of about 0.25-0.5 mm. Relief elements having different curvatures and / or diameters can be used on a given foil. In some embodiments, it is advantageous for the relief elements to share a common tangent plane at their vertices.

[0045] To prevent suction cupping, the lidstock has an inner surface on which relief elements are formed; however, the outer surface E of the lidstock may or may not have contours corresponding to the relief elements. In some cases, it is preferred that the outer surface does not have a corresponding contour, and that the outer surface is flat. A flat outer surface, for example, makes it easier to print on the outer surface.

[0046] The relief elements may be formed in any suitable manner, for example using embossing techniques by pressing a stamp (also called a die) having a profile corresponding to the relief structure to be formed on the lidstock, or using additive or subtractive manufacturing techniques.

[0047] The embossing procedure to impart at least one relief element to the lidstock can be carried out at any time before or after heat sealing; however, it is typically advantageous to form the relief pattern at a time different from the formation of the heat seal to avoid affecting the integrity of the heat seal. Furthermore, in some cases, it is advantageous to combine the step of forming the at least one relief element with another step (i.e., with a step performed in the processing station described above), thereby allowing for time and energy efficiencies.

[0048] In some embodiments, the stamp used for leak testing is machined to form the desired relief pattern, which is formed in the lidstock when pressure is applied by the stamp to test for leaks (i.e., air or hydration fluid leakage). The stamp along the bottom surface is flat except for the portion that forms the relief element. The diameter of the bottom surface is typically approximately equal to (but smaller than) the diameter of the blister package cavity. The bottom portion of the stamp adjacent to and radially outward from the bottom surface may have a rounded bevel. When pressure is applied to the lidstock, the beveled portion can create a contour in the lidstock adjacent to the heat seal (see, for example, raised portion BU as shown in FIG. 2A). Another technique for forming the relief structure uses a cylindrical roller; when a roller is used, a contour corresponding to the relief structure is formed on the roller, and the roller is rolled along the inside or outside of the lidstock to form the relief structure in the lidstock. It will be appreciated that if the relief structure is formed by applying a force to the inside of the lidstock, the pattern on the roller will be the inverse of the pattern formed on the inside surface of the lidstock.

[0049] Regardless of the technique used to apply the relief pattern, the objective is to apply a force to the packaging foil that exceeds the yield strength of the foil so that the pattern is maintained in the packaging foil after the force is applied, but below the point that would cause fracture anywhere along the foil, thereby avoiding the formation of holes in any layer of the foil. As noted above, patterns with dome-shaped elements facilitate the avoidance of fracture during the formation of the relief elements.

[0050] While various embodiments have been shown and described in detail herein, it will be apparent to those skilled in the art that various modifications, additions, substitutions, and the like, can be made without departing from the spirit of the invention and are therefore considered to be within the scope of the invention as defined in the claims that follow.

[0051] Further embodiments of the present invention are defined in the following clauses: Item 1: A contact lens package, a blister package defining a cavity; a contact lens disposed in an unstressed state within said cavity; a lens hydrating solution partially filling said cavity; a lidstock sealed to the blister package, the lidstock segment in combination with the cavity forming an enclosure for the lens and the lens hydration solution, the segment having an inner surface including at least one relief element, the inner surface being flat except for the at least one relief element; and a gap disposed between the upper surface of the lens hydration solution and at least a portion of the inner surface; Including the package. Item 2: The package of item 1, wherein the lens hydration solution fills at most 99% of the volume of the cavity. Item 3: The package of item 1, wherein the lens hydration solution fills at most 98% of the volume of the cavity. Item 4: The package of item 1, wherein the lens hydration solution fills at most 95% of the volume of the cavity. Item 5: The package of item 1, wherein the lens hydration solution fills at most 90% of the volume of the cavity. Item 6: The package of item 1, wherein the at least one relief element comprises a periodic structure. Item 7: The package of item 6, wherein the structures are periodic along a line extending through the center of the segment. Item 8: The package of item 1, wherein the at least one relief element extends along a flat portion of the lidstock and comprises a non-periodic structure along every line extending through the center of the segment. Item 9: The package of item 1, wherein the at least one relief element consists of a single relief element. Item 10: The package of item 1, wherein the exterior surface of the lid material is flat. Item 11: The package of item 1, wherein the lid material includes an innermost layer that is a plastic resin. Item 12: A contact lens package, a blister package defining a cavity; a contact lens disposed in an unstressed state within said cavity; a lens hydrating solution partially filling said cavity; a lidstock sealed to the blister package, wherein a segment of the lidstock in combination with the cavity forms an enclosure for the lens and the lens hydration solution, the segment having an inner surface including at least one dome-shaped relief element, the inner surface being flat except for the at least one relief element. Including the package. Item 13: The package of item 12, wherein the lens hydration solution fills at most 99% of the volume of the cavity. Item 14: The package of item 12, wherein the lens hydration solution fills at most 95% of the volume of the cavity. Item 15: The package of item 12, wherein the at least one relief element comprises a periodic structure. Item 16: The package of item 15, wherein the structures are periodic along a line extending through the center of the segment. Item 17: The package of item 12, wherein the at least one relief element extends along the flat portion of the lidstock and comprises a non-periodic structure along every line extending through the center of the segment. Item 18: A method for manufacturing a contact lens package, comprising: manufacturing a structure including a blister package defining a cavity, a contact lens disposed within the cavity, a lens hydration solution partially filling the cavity, and a lidstock sealed to the blister package, wherein a segment of the lidstock in combination with the cavity forms an enclosure for the lens and the lens hydration solution; and inspecting the structure for leaks by applying pressure to the lidstock with a stamp having a contour corresponding to at least one relief element, the pressure forming the at least one relief element on the interior surface of the lidstock. A method comprising:

Claims

1. 1. A contact lens package comprising: a blister package defining a cavity; a contact lens disposed in an unstressed state within said cavity; a lens hydrating solution partially filling said cavity; a lidstock sealed to the blister package, the lidstock segment in combination with the cavity forming an enclosure for the lens and the lens hydration solution, the segment having an inner surface including at least one relief element, the inner surface being flat except for the at least one relief element; and a gap disposed between the upper surface of the lens hydration solution and at least a portion of the inner surface; Including the package.

2. 10. The package of claim 1, wherein the lens hydration solution fills at most 99% of the volume of the cavity.

3. 10. The package of claim 1, wherein the lens hydration solution fills at most 98% of the volume of the cavity.

4. 10. The package of claim 1, wherein the lens hydration solution fills at most 95% of the volume of the cavity.

5. 10. The package of claim 1, wherein the lens hydration solution fills at most 90% of the volume of the cavity.

6. The package according to any one of claims 1 to 5, characterized in that the at least one relief element comprises a periodic structure.

7. 7. The package of claim 6, wherein the structure is periodic along a line extending through the center of the segment.

8. 6. A package according to any one of claims 1 to 5, characterized in that the at least one relief element extends along a flat portion of the lidstock and comprises a non-periodic structure along all lines extending through the centre of the segment.

9. A package according to any one of claims 1 to 5 or 8, characterized in that the at least one relief element consists of a single relief element.

10. The package according to any one of claims 1 to 9, wherein the outer surface of the lid material is flat.

11. The package according to any one of claims 1 to 10, wherein the lid material includes an innermost layer that is a plastic resin.

12. 1. A contact lens package comprising: a blister package defining a cavity; a contact lens disposed in an unstressed state within said cavity; a lens hydrating solution partially filling said cavity; a lidstock sealed to the blister package, wherein a segment of the lidstock in combination with the cavity forms an enclosure for the lens and the lens hydration solution, the segment having an inner surface including at least one dome-shaped relief element, the inner surface being flat except for the at least one relief element. Including the package.

13. 13. The package of claim 12, wherein the lens hydration solution fills at most 99% of the volume of the cavity.

14. 13. The package of claim 12, wherein the lens hydration solution fills at most 95% of the volume of the cavity.

15. The package according to any one of claims 12 to 14, characterized in that the at least one relief element comprises a periodic structure.

16. 16. The package of claim 15, wherein the structure is periodic along a line extending through the center of the segment.

17. 15. A package according to any one of claims 12 to 14, characterized in that the at least one relief element extends along a flat portion of the lidstock and comprises a non-periodic structure along all lines extending through the centre of the segment.

18. 1. A method for manufacturing a contact lens package, comprising: manufacturing a structure including a blister package defining a cavity, a contact lens disposed within the cavity, a lens hydration solution partially filling the cavity, and a lidstock sealed to the blister package, wherein a segment of the lidstock in combination with the cavity forms an enclosure for the lens and the lens hydration solution; and inspecting the structure for leaks by applying pressure to the lidstock with a stamp having a contour corresponding to at least one relief element, the pressure forming the at least one relief element on an interior surface of the lidstock. A method comprising:

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