Contact lens package
View Patent ↗A blister package housing a contact lens is described. The package generally includes a base member including a cavity having a bottom surface, for containing a contact lens immersed in a liquid medium. The base member can include a grip region including a curved top surface shaped to accommodate a thumb and a curved bottom surface shaped to accommodate an inner curve of a forefinger. Silicone hydrogel contact lenses located in the liquid medium have a reduced tendency to stick to the bottom surface of the cavity without requiring a surfactant and/or a surface modification of the bottom surface.
1. A contact lens package, comprising
a base member comprising a hydrophobic material and having a bottom surface and a sidewall contacting the bottom surface to form a cavity;
a liquid medium located in the cavity; and
a silicone hydrogel contact lens without a surface treatment, having an advancing contact angle of less than 66° and located in the liquid medium, the silicone hydrogel contact lens comprising a material effective in reducing the tendency for the lens to stick to the bottom surface of the cavity without requiring an anti-attachment agent selected from the group consisting of a surfactant, a surface modification of the bottom surface, and a combination of a surfactant and a surface modification of the bottom surface, to reduce the tendency of the lens to stick to the bottom surface.
2. The package of claim 1 , wherein the hydrophobic material comprises a polyolefin polymeric material.
3. The package of claim 1 , wherein the hydrophobic material comprises a polypropylene material.
4. The package of claim 1 , wherein the base member is a molded polypropylene element.
5. The package of claim 1 , wherein the base member further comprises a flange extending from the cavity.
6. The package of claim 1 , wherein the sidewall comprises at least one planar surface and at least one curved surface, each surface substantially perpendicularly oriented to the bottom surface of the cavity.
7. The package of claim 1 , wherein the sidewall is oriented at a non-perpendicular angle to the bottom surface.
8. The package of claim 1 , wherein the bottom surface is devoid of a ridge or a groove.
9. The package of claim 1 , wherein the bottom surface has a planar surface topography.
10. The package of claim 1 , wherein the liquid medium comprises saline.
11. The package of claim 1 , wherein the liquid medium comprises a phosphate buffer.
12. The package of claim 1 , wherein the liquid medium is free of surfactant.
13. The package of claim 1 , wherein the liquid medium comprises an amount of a surfactant effective in enhancing the wettability of the contact lens.
14. The package of claim 1 , further comprising a seal attached to the base member to maintain the liquid medium in a sterile condition.
15. The package of claim 1 , wherein the silicone hydrogel contact lens has an advancing contact angle of less than 60°.
16. The package of claim 1 , wherein the silicone hydrogel contact lens has a hysteresis less than about 18°.
17. The package of claim 1 , wherein the silicone hydrogel contact lens has a hysteresis less than about 15°.
18. The package of claim 1 , wherein the silicone hydrogel contact lens has a hysteresis less than about 10°.
19. The package of claim 1 , wherein the silicone hydrogel contact lens has a hysteresis about 5° or less.