Contact lens package with reduced lens-package interactions and method of making
The packages described by this invention all have reduced “head space,” that is, the distance from lid to lens. Packages contain dimples to achieve this reduced head space. Specifically, packages are designed with dimple sag equal to or less than 1.90-mm, or volume displaced equal to or less than 360 μl. Combined with the existing primary packaging, it has been found that such conditions provide for reduction in folded lens rate during shipping and handling. As well, lenses stored or having an extended time in low head space packages in a “foil down” orientation now have characteristics closer lenses stored in a “foil up orientation.” The packages finally include a foil 3D pattern at a smaller scale than the dimple, by embossing or other methods allowing reduce lens sticking to the foil as well as an added anti-counterfeiting measure.
1. A method for preventing counterfeiting a lens package comprising the steps of:
providing a lens package with means for evidencing counterfeiting included therein, said package comprising:
a bulb having a rim and comprising a volume;
a generally thin cover placed over said bulb, said cover being generally flat;
a contact lens contained in solution in said bulb; and
such that said cover is sealed to said bulb at said rim, and said cover formed from a generally flexible material, such that when said cover is sealed to said bulb, a dimple is formed in said cover, said dimple having a concavity defining a sag depth, such that the concavity displaces volume from the volume of the bulb; and
wherein the means for evidencing counterfeiting comprises a site on said cover for placing an emboss, and an emboss contained on said cover, with said emboss chosen from a set of predetermined embosses; and
varying said emboss on said cover at predetermined times dependent on the expiration usage date of the lens contained therein, such that a variation of said emboss with the then-current emboss evidences an indication of counterfeiting of said package.
2. The method of claim 1 wherein the dimple contains said emboss.
3. The method of claim 2 wherein the emboss is cross-shaped.
4. The method of claim 2 wherein the emboss is starfish-shaped.
5. The method of claim 2 wherein the emboss is a three-pointed star shape.
6. The method of claim 1 wherein the emboss is ornamental.
7. The method of claim 6 wherein the emboss is cross-shaped.
8. The method of claim 6 wherein the emboss is starfish-shaped.
9. The method of claim 6 wherein the emboss is a three-pointed star shape.