Contact lens treating solution

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.

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.