Claims
- 1. A method for cleaning a contact lens comprising:
- contacting a contact lens in a liquid medium containing an acid acting enzyme component in an amount effective to remove debris from a contact lens located in said liquid medium, said liquid medium being weakly buffered at an acidic pH at which said acid acting enzyme component is active;
- removing said contact lens from said liquid medium; and
- directly placing said contact liens into an eye.
- 2. The method of claim 1 wherein said liquid medium is an aqueous liquid medium.
- 3. The method of claim 1 wherein said liquid medium includes an effective amount of a buffer component selected from the group consisting of citric acid-disodium hydrogen phosphate, acetic acid-sodium acetate and succinic acid-sodium hydroxide.
- 4. The method of claim 1 wherein said liquid medium includes an effective amount of a surfactant component.
- 5. The method of claim 1 wherein said surfactant component is nonionic.
- 6. The method of claim 1 wherein said acid acting enzyme component is selected from the group consisting of acid proteases.
- 7. The method of claim 1 wherein a residual amount of said liquid medium is directly placed into the eye together with said contact lens, the buffering of said residual amount of said liquid medium being substantially ineffective in the eye.
- 8. The method of claim 1 wherein said liquid medium includes an effective amount of a disinfectant component and said contacting is effective to disinfect the contact lens.
- 9. The method of claim 8 wherein said disinfectant component is non-oxidative.
- 10. The method of claim 1 wherein said contact lens comprises a hydrogel and the conditions present in said liquid medium are effective to substantially maintain the water content of said contact lens.
- 11. The method of claim 10 wherein said liquid medium is an aqueous liquid medium.
- 12. The method of claim 11 wherein said aqueous liquid medium includes a solute component in an amount effective to counter the lens deswelling effect of said acidic pH.
- 13. The method of claim 12 wherein said solute component is selected from the group consisting of osmolytes which tend to swell the contact lens.
- 14. The method of claim 11 wherein said aqueous liquid medium is hypotonic.
- 15. The method of claim 14 wherein said liquid aqueous medium has an osmolality less than about 290 mOsmol/kg.
Parent Case Info
This is a division of application Ser. No. 08/673,993, filed Jul. 1, 1996, now U.S. Pat. No. 5,630,884, which, in turn, is a division of application Ser. No. 08/343,284 filed Nov. 22, 1994, now abandoned, which, in turn, is a continuation of application Ser. No. 08/079,195, filed Jun. 17, 1993, now abandoned.
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Divisions (2)
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Number |
Date |
Country |
Parent |
673993 |
Jul 1996 |
|
Parent |
343284 |
Nov 1994 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
79195 |
Jun 1993 |
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