Contact lens package with reduced head space
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.”
1. A lens package, comprising:
a bulb having a rim and comprising a volume;
a generally thin cover placed over said bulb, said cover having a generally flat configuration;
a contact lens contained in solution in said bulb;
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.
2. The package of claim 1 wherein the dimple has a diameter of 11 to 20-mm.
3. The package of claim 2 wherein the dimple has a diameter of 13 mm.
4. The package of claim 1 wherein the dimple has a sag depth of 0.9 to 2.2-mm.
5. The package of claim 4 wherein the dimple has a sag depth of 1.2 to 1.9-mm.
6. The package of claim 5 wherein the dimple has a sag depth of 1.3 mm.
7. The package of claim 1 wherein the dimple has an elliptical profile of 16 mm by 13 mm.
8. The package of claim 1 wherein the dimple has an ornamental emboss.
9. A lens package, comprising:
a bulb having a rim and comprising a volume, and containing a generally circular opening formed by said rim and a surface projecting from said opening such that said volume is contained therein;
a generally thin cover placed over said bulb at said opening;
a contact lens contained in solution in said bulb; and
wherein said cover is sealed to said bulb where said rim meets said cover, such that said solution in the bulb entirely covers the lens and further such that the cover formed from a generally flexible material placed close enough to the lens to prevent the lens from folding within said package.
10. The package of claim 9 wherein the cover contains a dimple with a diameter of 11 to 20-mm.
11. The package of claim 10 wherein the dimple has a diameter of 13 mm.
12. The package of claim 9 wherein the cover contains a dimple comprising a sag defined by a sag depth of 0.9 to 2.2-mm.
13. The package of claim 12 wherein the dimple has a sag depth of 1.2 to 1.9-mm.
14. The package of claim 13 wherein the dimple has a sag depth of 1.3 mm.
15. The package of claim 9 wherein the cover contains a dimple with an elliptical profile of 16 mm by 13 mm.
16. The package of claim 9 wherein the cover contains a dimple with an ornamental emboss.
17. A lens package, comprising:
a bulb having a rim and comprising a volume;
a generally thin cover sealed to said bulb, said cover having a generally flat configuration;
a contact lens contained in solution in said bulb; and
such that said cover is sealed to said bulb along a circumference where said rim meets said cover;
and such that the cover formed from a sufficiently flexible material to provide a dimple therein with a sag defining a sag depth such that a head space is formed between the cover and the solution said head space smaller than that formed by a cover without the dimple.
18. The package of claim 17 wherein the dimple has a diameter of 11 to 20-mm.
19. The package of claim 18 wherein the dimple has a diameter of 13 mm.
20. The package of claim 17 wherein the dimple has a sag depth of 0.9 to 2.2-mm.
21. The package of claim 20 wherein the dimple has a sag depth of 1.2 to 1.9-mm.
22. The package of claim 21 wherein the dimple has a sag depth of 1.3 mm.
23. The package of claim 17 wherein the dimple has an elliptical profile of 16 mm by 13 mm.
24. The package of claim 17 wherein the dimple has an ornamental emboss.