CONTACT LENS TREATING SOLUTION

1 . A contact lens treating solution, comprising:

(a) one or more potassium salts selected from the group consisting of potassium chloride, potassium citrate, potassium hydroxide, potassium borate, potassium ethylenediaminetetraacetic acid and potassium phosphate;

(b) an antimicrobial agent comprising alexidine or a salt or a free base thereof; and

(c) optionally, one or more sodium salts selected from the group consisting of sodium sodium citrate, sodium hydroxide, sodium phosphate, sodium chloride, ethylenediaminetetraacetic acid and sodium borate;

wherein the one or more potassium salts are present in an amount greater than an amount of the one or more sodium salts when present.

2 . The contact lens treating solution according to claim 1 , wherein the one or more potassium salts include potassium chloride and the corresponding sodium salt is sodium chloride.

3 . The contact lens treating solution according to claim 1 , wherein the antimicrobial agent comprises alexidine.

4 . The contact lens treating solution according to claim 1 , comprising:

(a) about 0.02 to about 1.5 wt. % of the one or more potassium salts, based on the total weight of the contact lens treating solution; and

(b) about 0.0001 to about 0.0006 wt. % of the antimicrobial agent, based on the total weight of the contact lens treating solution.

5 . The contact lens treating solution according to claim 1 , further comprising one or more additional antimicrobial agents.

6 . The contact lens treating solution according to claim 5 , wherein the one or more additional antimicrobial agents comprise one or more polyquaternium polymers.

7 . The contact lens treating solution according to claim 6 , wherein the one or more polyquaternium polymers comprise from about 30 to about 50,000 quaternary-amine-functional repeating units.

8 . The contact lens treating solution according to claim 6 , wherein the one or more polyquaternium polymers comprise Polyquaternium-1.

9 . The contact lens treating solution according to claim 6 , comprising:

about 0.0001 wt. % to about 0.0003 wt. %, based on the total weight of the contact lens treating solution, of the one or more polyquaternium polymers.

10 . The contact lens treating solution according to claim 5 , wherein the one or more additional antimicrobial agents are selected from the group consisting of a polymeric biguanide or a salt or a free base thereof, a terpene compound, a branched, glycerol monoalkyl ether, a branched, glycerol monoalkyl amine, a branched, glycerol monoalkyl sulphide, a fatty acid monoester, wherein the fatty acid monoester comprises an aliphatic fatty acid portion having six to fourteen carbon atoms and an aliphatic hydroxyl portion, an amidoamine compound, and combinations thereof.

11 . The contact lens treating solution according to claim 10 , wherein the polymeric biguanide or a salt or a free base thereof is a polymeric hexamethylene biguanide.

12 . The contact lens treating solution according to claim 1 , further comprising one or more surfactants.

13 . The contact lens treating solution according to claim 12 , wherein the one or more surfactants are selected from the group consisting of a poloxamer, a poloxamine and mixtures thereof.

14 . The contact lens treating solution according to claim 1 , further comprising one or more comfort agents.

15 . The contact lens treating solution according to claim 14 , wherein the one or more comfort agents are selected from the group consisting of a polyol, an antioxidant and a complex carbohydrate.

16 . The contact lens treating solution according to claim 1 , further comprising one or more polysaccharides.

17 . The contact lens treating solution according to claim 1 , wherein the sodium salt includes one or more of sodium chloride, sodium citrate, and sodium phosphate.

18 . The contact lens treating solution according to claim 1 , in the form of an eye care or a contact lens care product selected from the group consisting of eye drops, a contact lens preservative solution, a contact lens cleaning solution, and a contact lens multi-purpose solution.

19 . A method of cleaning and disinfecting a contact lens, the method comprising soaking the contact lens in one or more contact lens treating solutions for a time period sufficient to clean and disinfect the contact lens, wherein the one or more contact lens treating solutions comprise:

(a) one or more potassium salts selected from the group consisting of potassium chloride, potassium citrate, potassium hydroxide, potassium borate, potassium ethylenediaminetetraacetic acid and potassium phosphate;

(b) an antimicrobial agent comprising alexidine or a salt or a free base thereof; and

(c) optionally, one or more sodium salts selected from the group consisting of sodium sodium citrate, sodium hydroxide, sodium phosphate, sodium chloride, ethylenediaminetetraacetic acid and sodium borate;

wherein the one or more potassium salts are present in an amount greater than an amount of the one or more sodium salts when present.

20 . A method for inhibiting adhesion of bacteria to a surface of a contact lens, the method comprising contacting the surface of the contact lens with one or more contact lens treating solutions comprising:

(a) one or more potassium salts selected from the group consisting of potassium chloride, potassium citrate, potassium hydroxide, potassium borate, potassium ethylenediaminetetraacetic acid and potassium phosphate;

(b) an antimicrobial agent comprising alexidine or a salt or a free base thereof; and

(c) optionally, one or more sodium salts selected from the group consisting of sodium chloride, sodium citrate, sodium hydroxide, sodium phosphate, sodium ethylenediaminetetraacetic acid and sodium borate;

wherein the one or more potassium salts are present in an amount greater than an amount of the one or more sodium salts when present.