# US 8,785,360 B1 · Method and system for color changing contact lens solution > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,360 B1 - Document ID: US8785360B1 - Status: Granted - Kind: B1 - Application number: 13/209,431 - Filed: 2011-08-14 - Granted: 2014-07-22 - Earliest claimed: 2010-08-14 - Applicants: Ian Herrick; Heather Sheardown; Lina Liu; Laura Anne Wells; Lyndon William James Jones - Inventors: Ian Herrick; Heather Sheardown; Lina Liu; Laura Anne Wells; Lyndon William James Jones - Web page: https://patentgrep.com/patent/US8785360B1 ## CPC - C11D 3/48: Medical, disinfecting agents, disinfecting, antibacterial, germicidal or antimicrobial compositions - A61L 12/08: using chemical substances - C11D 3/0078: {Compositions for cleaning contact lenses, spectacles or lenses} - C11D 3/40: Dyes {; Pigments} - C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) ## Abstract A used contact lens is placed in a contact lens receptacle. An aqueous composition is added to the contact lens receptacle, the aqueous composition capable of changing from a first appearance to a second appearance in response to an interaction with the used contact lens after a predetermined period of time. ## Claims ### Claim 1 A method comprising: placing a used contact lens in a contact lens receptacle; and adding, from a liquid container, a color changing aqueous composition to the contact lens receptacle, the color changing aqueous composition being capable of changing from a first appearance to a second appearance in response to the color changing aqueous composition's interaction with the used contact lens after a predetermined period of time; wherein the aqueous composition includes a protein responsive dye comprising at least one of: a BCA dye (bichinchoninic acid and cupric ion), a Ninhydrin dye, and a bacterial dye. ### Claim 2 (depends on 1) The method of claim 1, wherein the used contact lens contains protein deposits from usage, and the protein responsive dye is reactive to the protein deposits. ### Claim 3 (depends on 2) The method of claim 2, wherein the protein deposits comprise lysozyme protein deposits. ### Claim 4 (depends on 2) The method of claim 2, wherein the protein deposits comprise lactoferrin protein deposits. ### Claim 5 (depends on 1) The method of claim 1, wherein the change of the aqueous composition from the first appearance to the second appearance indicates that the protein deposits have been removed from the used contact lens. ### Claim 6 (depends on 1) The method of claim 1, further comprising: discarding the aqueous composition from the contact lens receptacle; placing a different used contact lens in the contact lens receptacle; and adding new aqueous composition to the contact lens receptacle. ### Claim 7 (depends on 1) The method of claim 1, wherein the predetermined period of time is less than 24 hours. ### Claim 8 (depends on 1) The method of claim 1, wherein the predetermined period of time corresponds to an amount of time required to disinfect a used contact lens. ### Claim 9 A system for sanitizing a contact lens comprising: a liquid container; a color changing aqueous composition stored in the liquid container and having a first appearance; and a contact lens storage receptacle; wherein the color changing aqueous composition is applied to the used contact lens in the contact lens storage receptacle, and wherein the color changing aqueous composition is configured to change from the first appearance to a second appearance when applied to the used contact lens for a predetermined period of time; wherein the aqueous composition includes a protein responsive dye comprising at least one of: a BCA dye (bichinchoninic acid and cupric ion), a Ninhydrin dye, and a bacterial dye. ### Claim 10 (depends on 9) The system of claim 9, wherein the used contact lens contains protein deposits from usage, and the protein responsive dye is reactive to the protein deposits. ### Claim 11 (depends on 10) The system of claim 10, wherein the protein deposits comprise at least one of lysozyme protein deposits and lactoferrin protein deposits. ### Claim 12 (depends on 9) The system of claim 9, wherein the predetermined period of time is less than 24 hours. ### Claim 13 An aqueous composition comprising: an ophthalmic contact lens cleaning solution; a protein responsive dye reactive to deposits on a used contact lens; wherein a reaction between the protein responsive dye and the deposits cause the aqueous composition to change from the first appearance to a second appearance when applied to the used contact lens for a predetermined period of time; wherein the aqueous composition includes a protein responsive dye comprising at least one of: a BCA dye (bichinchoninic acid and cupric ion), a Ninhydrin dye, and a bacterial dye. ### Claim 14 (depends on 13) The aqueous composition of claim 13, wherein the deposits include protein deposits resulting from usage of the used contact lens, and the protein responsive dye is reactive to the protein deposits. ### Claim 15 (depends on 13) The aqueous composition of claim 13, wherein the protein deposits comprise at least one of: lysozyme protein deposits and lactoferrin protein deposits.